Worlds largest mirror telescope relies on nanometer accuracy inductive sensors from Micro-Epsilon
The European Southern Observatory based in Garching, Germany, is relying on high precision displacement measurement systems from Micro-Epsilon for a project to build the world’s largest mirror telescope in Chile, which also involves French cooperation partner Fogale. The inductive sensor systems used for displacement measurement are the most precise ever used in a telescope and determine the position of each single mirror segment in three axes to nanometer accuracy.
The construction of the largest, optical and near-infrared telescope in the world is progressing, with completion planned in 2024. The revolutionary European Extremely Large Telescope (E-ELT) is a project of the European Southern Observatory (ESO) on the Cerro Armazones mountain in Chile and will be second to none in size. A major contract for this project involving several thousand high precision sensors has now been awarded to Micro-Epsilon in Germany. With more than 6,000 engineer-years of experience and 120 patents, Micro-Epsilon stands out due to its widespread knowledge in high precision sensor technology. The globally operating sensor manufacturer employs around 1,000 people in the Group, with almost 400 at its Lower Bavarian headquarters.
The sensors for the giant telescope supplied by Micro-Epsilon play a crucial role in this research project. The telescope uses a unique, optical system with five mirrors and requires optical and mechanical elements that push modern technology to its limits. The diameter of the main mirror alone will be 39 metres – half the length of a football pitch. With a total surface area of 978 square metres, the mirror consists of 798 single segments, each 1.4 metres in size but only 5 centimetres thick. These honeycomb segments must be aligned precisely to each other in order to form a perfect optical system. Their relative position can change due to outside interference from wind loads, fluctuating temperatures and, last but not least, gravity, which has different effects depending on the respective alignment of the E-ELT.
The sensors provided by the FAMES consortium (Fogale and Micro-Epsilon), ensure exact positioning to nanometer accuracies. Micro-Epsilon is responsible for manufacture of the sensors, which are the most precise ever used in a telescope. Measuring the relative position to nanometer accuracies therefore represents the fundamental core of this complex system. Predestined for outdoor applications, the sensors stand out due to their long-term temperature stability, as well as their high resistance to external influences.
The major challenge in this large-scale project involving more than 5,000 inductive displacement measurement systems is to achieve the required measurement precision to nanometer accuracy under such difficult ambient conditions. Micro-Epsilon’s managing director Martin Sellen is satisfied with the ESO cooperation: After developing these high precision sensors for such an important project, we can finally deliver the essential component for the world’s largest mirror telescope. The whole construction project pushes the boundaries of technical feasibility and so requires a longer planning period. In addition to economic importance, we can also bring our knowledge into international top-level research.”
The sensors used are based on the principle of inductive coupling and Micro-Epsilon’s widespread knowledge of eddy current measurement technology. The sensors measure on a wear-free, non-contact basis providing the highest precision and resolution. A special advantage of the sensor is its immunity to external influences such as dirt, pressure and humidity. The sensor consists of a transmitter coil and an opposite located arrangement of several receiver coils on the adjacent mirror segment.
The transmitter coil is supplied with alternating current. The voltage induced by inductive coupling in the receiver coils depends on the position of the transmitter coil. The patented evaluation of the partial signals enables the determination of the position of the segments relative to each other in three axes. The special coil is designed in accordance with Micro-Epsilon’s Embedded Coil Technology (ECT) eddy current sensors, which differ significantly from the wound coils found in conventional sensors. The coil itself is embedded in an inorganic carrier material. Their innovative design provides the sensors with an extremely high temperature rating and long-term stability, as well as excellent repeatability.
Building such an enormous telescope fulfils an important role in ground-based astronomy and should expand astrophysical knowledge significantly. The next generation E-ELT telescope enables the exploration of red-shifted galaxies, star formation, exoplanets and protoplanetary disks. With this project, ESO wants the E-ELT telescope to revolutionise the exploration of the universe with its gigantic main mirror and adaptive optics (AO) technology – just as Galileo did 400 years ago, when he was the first to turn a telescope towards the sky. The telescope may help to answer some major scientific challenges of our time. Do other Earth-like planets exist that we could live and survive on? What are the characteristics of the first stars and galaxies, dark matter, dark energy and early Black Holes?
The telescopic system has a total weight of 2,800 tonnes and can rotate through 360 degrees. Compared to today’s high-end telescopes, the E-ELT telescope will be four to five times larger and receive 15 times more light. It will capture 100 million times more light than the human eye, 8 million times more than Galileo’s telescope, and in total, more light than all existing 8-10 metre telescopes on Earth.
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- New high speed laser line sensor for shiny, difficult-to-measure surfaces
- New 8mm inductive LVDT probes suits high volume OEM environments
- New Sick KTM proves high-speed sensing performance comes in a 'mini' package
- Column level indicators with Oil and Glycol capabilities
- A handy guide to selecting non-contact sensors
- Flexible and non-contact measurement of motor speed
- Metal detectors keep veg moving safely
- Partnership success for Zettlex and Flo Mon
- Proximity sensors: there is more choice than you think
- Renishaw completes laser measurement acquisition
- Variohm Holdings Group acquires Herga
- Reliable colour detection even with minimal distance change
- Device enables fast, easy alignment of rotating plant
- High resolution position sensor for harsh industrial environments
- New range of integrated 24-bit pressure/temperature PCB-mount sensors
- Tape extension sensor for cost-sensitive applications
- Compact, affordable protection
- Control technology improves hygienic food production
- De-mystifying PID feedback loop control
- Laser sensor for food and beverage applications
- Minimising whole life costs starts with product selection
- Pressure transducers for rail applications
- Robust wheel diameter gauge
- Super smart helicopter load hook knows everything
- M8 redesign - more models, new design
- New single-axis tilt alert switch for cost-effective out of level position indication
- SICK launches CLV610 for plug-and-play product identification
- Gems Sensors and Controls new sensor range saves time and cost in hazardous applications
- Rugged and reliable sensor system
- Latest Kistler maXYmos BL keeps quality and costs under control
- OEM Automatic acquires distributor Datasensor
- Technical springs tested for demanding automotive tasks
- Turck Banner expand position sensor series for measuring ranges from 50 to 300mm
- UK sensor technology used in record breaking unmanned aircraft flight
- Lightweight miniature press force sensor has wide measuring range
- Bearing-less, large shaft mounted optical incremental encoder plant and machinery
- Kistler KiTorq gets extended measuring ranges
- Variohm launch comprehensive range of level and flow sensors
- Zettlex and Astrium co-develop sensors for space
- Sick launches next-generation ultrasonic fork sensors
- Affordable dew point transmitter
- Compact recording system is low cost option
- EtherCAT interface for transducer range
- Even baby sea otters need pressure switches
- Extremely compact angle sensor for tight spaces
- Responsible use of chemicals
- Temperature controller features full software-based interface
- Tiny sensors for use in the smallest installation spaces
- New software tool enables faster, easier configuration of laser scanners
- Inductive linear position sensor for motion control
- Miniature rugged draw-wire sensors for fast movements and short displacements
- Multi-talented ultrasonic sensors for difficult applications
- Zettlex expands its IncOder range to 30,000 products
- Free evening lecture for the IET - Lasers, Cameras, Action
- Alternative to conventional variable area flowmeters
- Automotive innovations torque up UK manufacturing revival
- Fork sensors for fluid detection
- High pressure transducers
- How inductive sensors work
- Linear position sensors for hydraulic cylinders
- Measuring the gaps in multi-layer PV modules
- Pressure sensing for stage automation
- Steute completes move to new larger premises
- Schaeffler provides online condition monitoring of turbines at Crystal Rig wind farm
- Galvo and Controller Combination Offers Infinite Field of View and >24-Bit Resolution
- Sensortechnics changes name to First Sensor
- Burkert launches new version of multiCELL universal transmitter and sensor controller
- Customised force sensors deployed on the Mars Rover Curiosity
- Futek's sensors are now on Mars
- Going with the flow
- Micro-Epsilon turns up the heat at Sensing Technology 2012
- New hygrometer design increases reliability of tests in climatic chambers
- Next generation pressure sensing film technology
- Non-contact position sensing: Inductive vs capacitive
- Renishaw shortlisted for top manufacturing award
- A simple breath of air brings control to a revolutionary hands-free fishing system
- EtherCAT sensors enable real time measurements
- Intelligent sensor simplifies condition monitoring tasks
- Registration sensors
- Sensors playing key role in electric vehicle development
- Guarding hovercraft drivetrains
- Sensors: the next big thing
- Compact, affordable protection for small to medium machines
- Compact online sensor monitors condition of vibrating screens, pumps and motors
- Engineers torque high tech to medics
- Monitor temperatures with this iPhone add-on
- RDP supports university's submarine challenge
- Safety and hygiene guaranteed
- Selecting position sensors in high vibration environments
- Distance positioning sensor achieves new levels of accuracy
- Fast distance measuring at 500m
- Driving sense into innovation
- What's best for preserving wine: pressure or vacuum?
- Zettlex wins space bid
- New products from Leuze at Drives and Controls
- Autonomous Data Collector DCX-25 PVDF
- Angle sensors prove their worth in wave power plant
- Precision position feedback
- Harting adds RFID technology to industrial connectivity solutions
- ATEX approval for inclination and acceleration sensor
- Joysticks & sensors
- Relaunch boosts controls specialist
- Value for money torque sensor is maintenance free
- Choosing the right flowmeter
- Detecting metal particles in lubricating oils
- Under pressure: an engineer's guide to pressure switches
- New improved online condition monitoring system for wind turbines
- Availability in the cloud
- Wireless switch for Ex zones
- Self powered technology cuts energy costs
- Step change in laser sensor performance
- Laser profile scanner inspects weld seams on steel pipes at Metco
- More knowledge equals less power
- Easily integrated pressure transmitters for OEMs with digital and ratiometric interfaces
- LabVIEW flexibility meets I/O and control needs on ROV
- Absolute traceability
- Industrial solenoids
- Making sense of MEMS
- Optimising processes for bio-diesel production
- Sensor film reveals relative temperature in 0.1 seconds
- Vehicle Technology
- Why Stuxnet has changed the security landscape
- Heidenhain service exchange makes sound economic sense
- Self custom float level indicators from Elesa
- Approved distributors give Heidenhain (GB) customers complete peace of mind
- Drama as helicopter sensor flies into theatre role
- Heavy duty industrial encoder has optical transmission
- Kistler cutting force training course
- Sound source localization
- Mobile machinery
- Sensor for bearing fault analysis
- Strain gauges
- Enamel coated pH sensors offer advantages over glass technology
- LNG tanks rely on ABB instrumentation
- Novel sensors aid tidal turbine development
- Technology transfer tests tree safety
- Amplifiers designed for wet environments
- Feeling alright?
- Load sensor gets smart
- Thermostats sealed against condensation
- Laser profile scanner
- Power network and quality meter with RS485 as standard
- Stainless steel pressure sensors offer high accuracy over wide temperature range
- Absolute encoder added to motion control range
- CANbus systems
- Fibre optic networks and sensing
- How to bring down a SCADA system island by island
- Linear position sensor for harsh environments
- Wireless telemetry system for strain gauge sensors
- Custom eddy current and draw wire sensors for subsea oil and gas applications
- Faster dew-point measurements from portable instrument
- Ethernet switches key in offshore LNG terminal
- Pressure sensors
- Sensors and Transducers
- Tube connectors
- Kistler introduces a low range 3-component force link
- Selecting the right temperature sensor
- Surveillance shrugs off its 'Big Brother' image
- Encoder order signals electric vehicle success
- How safe are your temperature sensors?
- Infrared for R&D
- NI announces over 8000 drivers through IDNet
- Vacuum seals tested but not touched
- Heidenhain GB restructures for continued growth
- SICK launches industrial instrument division
- Diagnose your system from any location via a web browser
- Eight Ethernet terminals in one compact device
- New editions of CIP network specifications
- SICK selection guide to encoders
- Thermistors monitor critical systems for NASA astronauts
- Versatile mass flow meter available for CO2 applications
- Wind power components get accelerated life testing
- CLPA to support UK OEMs exporting to Asia
- LG Motion appointed Heidenhain distributor
- Guide to advanced technologies for test, control and design
- High-performance controllers use multicore technology
- Improved platform for generating test radio signals
- LEGO Mindstorms NXT Version 1.1 delivers higher performance
- National Instruments becomes member of Power.org
- National Instruments joins the Multicore Association
- New controller simplifies embedded system design
- New Embedded Systems Laboratory for engineering students
- NI releases 11 new PXI RF switches
- NI teams with Analog Devices for embedded systems
- PXI Express products handle 600MB/s data streaming
- Registrations open for 2008 Military/Aerospace Conference
- Revised draft standard for mathematics semantics
- Sound and vibration monitoring for machines
- Telecommunications board enables concepts to be visualised
- The first PXI Express timing and synchronisation controller
- True RMS RF power meter is powered by USB cable
- Dual detection is sweet solution
- Improved performance of all-electric motorcycle at Isle Of Man TTX GP
- Joystick controller
- Production relies on RFID for quality management
- New Fieldbus Input/Output system from SMC
- Rapid expansion means new premises
- Safe industrial processes with MB Cap Ultra
- Telescope relies on custom eddy current sensors
- Safe landing assured with gearbox testing
- Save energy by monitoring machines and processes
- Kistler Group acquires Corrsys-Datron Sensorsysteme
- Your invitation to the Omron Technology Event
- Camden and Balluff sign partnership agreement
- Preventing the spread of swine flu
- CC-Link products
- CLPA brings assured reliability to Ford Mustang production
- Giving direction to extreme sports
- Machine condition monitoring made simple
- Easy network expansion
- Kistler expands vehicle test division
- Non-contact sensors
- Pressure transducers
- Torque sensors
- Wire draw sensors
- Position measurement
- Pushing the boundaries for test rigs
- Camera upgrade for Micro system
- Flir expands camera range
- New thermal imager boosts resolution
- Performance testing service for EtherNet/IP products
- Slashing the cost of thermal imaging
- Distributed control and monitoring
- Hall-effect foot pedal controller
- Simple solution for vibration proofing
- What price safety?
- Fire fighting vehicles boost stability with hydraulically controlled feet
- Monitor cylinder displacement with increased accuracy
- Where vision meets sensing
- Accurate, shock resistant accelerometers
- Analogue modules
- Encoder supports DeviceNet
- Engineers tuned in to CAN advantage
- Floating in process measurement technology
- High precision for servo inclinometers
- Low cost controllers suit every measurement task
- More options with ultra precise encoder
- Temperature sensing
- Putting cyber security in your sights
- Remote monitoring and control of important systems
- Control solutions
- Multi-parameter controller for effective water treatment
- Pressure gauges
- 3D software for laser profile sensor enables export to CAD
- Hygienic replaceable process connections
- Meeting industry demands for higher fibre port counts
- Simple monitoring and logging of flow and process variables
- Simple user interface for temperature controller
- Torque sensing is key as Lotus hybrid blooms
- Joysticks build-in safety cut-out
- RoHS option for load cell amplifier
- Airbag tests make passenger safety 100 percent secured
- Laser sensor has 50m range
- Vehicle systems
- Delivering the universal solution for plant networks
- Joysticks
- Power supply harmonics: pay attention or pay the price
- Vibration sensors
- Accelerated testing for ejector seats
- Capturing, counting and controlling small components
- Digital LVDT stroke transducer
- Ethernet switches get integrated power supplies
- Magnetic angular position sensor
- Modbus I/O units for easy integration
- New optical sensor for level measurement
- Transducer action
- Displacement and position sensing
- MVK Metal now available with ProfiNet interface
- Savings through flexible energy supply concept
- The long view for process instrumentation
- The search for true values
- Data line protection and optical isolation
- Field I/O communication with industrial Ethernet
- Industrial Ethernet for industrial applications
- Logic controller builds in pressure sensing solutions
- Multifunctional joystick with CANbus
- Protection against surges in voltage
- Residential networks
- Rising to the challenge of parallel processing
- Ten top tips to boost efficiency for heaters
- Innovation in temperature sensing
- Low cost draw wire sensors
- PAC solution controls classification process
- Sensor signal conditioning module costs under £35
- The world's first high resolution magnetic encoder
- Ethernet option for field I/O communication
- Mixed media Power over Ethernet switches offer flexible networking
- Positive positioning
- Reliability data management
- Aerospace testing
- Data acquisition and motion control for under £200
- Improved instrument control
- Low cost alternative to thermal imaging
- Protection from rogue currents
- Robust sensors can improve the dynamics of servo drive systems
- Submersible sensors
- Temperature and pressure
- Materials testing
- The serial challenge for industrial Ethernet
- Increased efficiency and reliability
- Media converters cut networking implementation costs
- New bus for components
- Sensor that saves space
- Laser sensor helps Jaguar Cars to guarantee pedestrian safety
- New sensor for remote detection of liquid levels
- Using automation to help reduce patients' suffering
- Amateur astronomer plans to map galaxy's structure
- Background suppression for just £31
- Compact 12-port Ethernet switch
- Handheld 2D code readers
- Hi-res laser sensor for less than £500
- High performance position measurement
- Industrial robots get touchy-feely for delicate tasks
- Innovative vision sensor in colour and monochrome
- Micro miniature LVDT package
- Remote control via your mobile phone
- Selecting the right temperature sensor
- Sensor has a clear advantage
- Guaranteed safety of rail tracks
- Measure the surface temperature of objects more precisely
- Condition monitoring for gas compressor
- Flight test program takes off
- Heating conductor system stops pipes freezing
- Improving on traditional resolvers
- LabVIEW updated to version 8.20
- Mini coded switch offers high torque and long life
- PWM offers low cost digital signalling
- ATEX approved pressure switches
- High grade inclinometer
- Industry first for Power over Ethernet
- Measure dewpoint in climatic chambers
- Sensors help guarantee quality of shavers
- Stainless sensors for washdown applications
- Vibration meter updated
- Kistler acquires German torque sensor specialist
- LEM introduces split core transducers for high currents
- Balluff's rugged Steelface sensor for extreme environments
- GarrettCom expands Ethernet switch range for the telecoms market
- Industry's most comprehensive battery monitoring sensor
- Materials Tester Checks Quality In Advanced Metrology Systems
- Part verification sensors are the pick of the bunch
- Relative humidity and temperature transmitter
- RoHS support for manufacturers
- Rotary position sensor for confined spaces
- Laser line profile sensor is easy to set up, configure and adapt
- Digital automation of oil tanker
- Marine engine pressure sensor
- Fit and forget linear displacement transducer
- Mount and protect photoelectric sensors
- Taking capacitive sensing to a new level
- Monitor multiple sensors on a single display
- High accuracy and high overload protection
- New additions to inductive proximity switches
- New damage diagnosis instrument
- The shape of things to come
- Tough sensors cover all the options
- Ultrasonic sensors in a standard package
- Brainboxes ready for RoHS
- Wireless remote sensor systems
- Belt misalignment on elevators solved
- Industrial application server increases productivity
- Advanced teach technology for temperature sensors
- Barometric pressure sensors for OEM applications
- Compact calibrator bridges the gap between portable and benchtop
- Compact, electronic, non-contact level sensor and monitor
- Contrinex sees the light
- Flexible but tough temperature sensors
- Flow monitor for large diameter pipes
- Hand-held thermometer measures up to 1800degC
- High quality, portable thermal calibrators
- Linear encoder for hostile or clean environments
- Linear encoders developed for PLC applications
- Medical thermal imager is claimed the world’s most accurate
- New high durability sensor is reliable in shock environments
- Newall launches its smallest linear encoder head
- Simple and affordable dew point measurement
- Smaller, lighter, faster, tougher encoders
- Smart sensing for automated assembly
- Stainless steel submersible level sensor
- Thermal imager fights the bird flu threat
- Weld-immune sensors from Contrinex
- Analysis crucial in Audi's Le Mans triumph
- Attitude and heading sensor
- Auto switch perfection with trimmer setting detection
- Bar code reader for advanced 2D and 1D codes
- High speed USB data acquisition
- Intelligent link in supply chain RFID
- IR thermometer with web browser
- Iron bird with the lightest touch
- Major upgrade for LabVIEW
- Measure up to 900 degrees with low cost thermometer
- Measurements on hard to reach machinery
- Monitoring hydraulic oils
- Narrow beam penetrates small openings
- Position monitoring benefits actuators
- Security at your fingertips
- Sensor takes a shine to tricky surfaces
- Thermal sensors for predictive monitoring
- Position sensors boost efficiency
- Pressure gauge with built in data logger
- Sensors keep conveyors on track
- Turck succeeds with sensors in China
- Wind farms stay up down under