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eagle ray corporation

A High Precision Laser Distance Sensor For Measurements on Natural Surfaces. eagle ray corporation. is proud to present:. DMR RANGEFINDER (Differentially Modulated Receiver). OVERVIEW. Optical distance sensing on natural surfaces can provide fast and accurate data

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eagle ray corporation

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  1. A High PrecisionLaser Distance SensorFor Measurements on Natural Surfaces eagle ray corporation is proud to present: DMR RANGEFINDER(Differentially Modulated Receiver)

  2. OVERVIEW • Optical distance sensing on natural surfaces can provide fast and accurate data • Most existing techniques deliver 1mm or lower accuracy at working distances beyond a few m • Many applications require greater accuracy, but current options are few and expensive

  3. OVERVIEW • DMR configuration enhances the performance of an established technique by up to 100x without major cost escalation • DMR sensors have the potential to achieve commercial success in a broad spectrum of applications

  4. OPPORTUNITY • Outperforms existing systems by up to 100x • Based on established, robust optical technique • Low/moderate cost hardware • Compatible with mass produced telecom emitters and modulators • Creation of new markets

  5. OPPORTUNITY • Surveying using optical rangefinding • Precise measurement of components or assemblies (alternative to contacting coordinate measuring machines) • Robotics, machine vision and guidance • Industrial sensors

  6. DMR Rangefinder PRIMARY TECHNIQUES • Geometrical/Triangulation • Interferometric • Time of Flight of Optical Pulse • Phase Shift of Modulated Beam

  7. S1 Emitter F S2 Receiver d Phase Comparator F Phase Difference  for Distance Calculation d = (n + /2)/2  = c/F Master Oscillator PHASE SHIFT of modulated beam

  8. PHASE SHIFT of modulated beam • Robust and fast • High accuracy, even at long range, using remote reflector • Distance measurements for surveying using prism targets • Poor performance on natural surfaces

  9. CURRENT CAPABILITIES with remote reflector • Short Range (~10m): Laser Tracker • Accuracy  20 microns (1 result per second) • S1 and S2 at 300MHz (1mW power) • Medium Range (~120m): GBT Metrology • Accuracy  50 microns (5 results per second) • S1 and S2 at 1.5GHz (1mW power)

  10. S1 Emitter 1000MHz S2 Receiver 1000MHz 999.999MHz Signal Generator 1kHz Electronic Mixer Phase Detector 1kHz (carries 1000MHz phase) CURRENT TECHNOLOGY electronic down-mixing

  11. CURRENT CAPABILITIES with natural surfaces • Accuracy  0.3mm to  3mm at working distance of 3m • S1 and S2 at frequencies between 14MHz and 700MHz • Emitted beam power typically 20-50mW • Scanning systems generating 1k-500k results per second

  12. FUNDAMENTALTECHNOLOGY LIMITS: received power • Weak reflected beam limits available S/N ratio and achievable phase measurement accuracy • Typical received beam power from rough surface at 10m range is 100pW, assuming a safe, 1mW emitted beam

  13. FUNDAMENTALTECHNOLOGY LIMITS: photon statistics • Photon statistics impose physical limit on available S/N ratio • 100pW  random arrival of 4 x 108 photons per second (for wavelength 800nm) • For 1 measurement per second, best achievable S/N ratio is (4 x 108)1/2 = 2 x 104 • Limiting ranging accuracy  7.5m using 1GHz modulation

  14. CURRENT TECHNOLOGYLIMITS: fast optical detectors • PIN photodiode low-cost and very stable, but very low S/N ratio at 1GHz • Avalanche PIN photodiode moderate cost and stability; S/N ratio better but still low • PMT high cost and low stability; S/N ratio good but still well below physical limit; practical frequency limit <1GHz

  15. 1000MHz Emitter S1 Signal Generator S3 999.999MHz Receiver S2 S4 Optical Modulator 1kHz PhaseDetector S5 1kHz (carries 1000MHz phase) FAST OPTICAL DETECTOR not required

  16. OPTICAL DOWN-MIXING schematic F = 1GHz, F = 0.95GHz,  = /2 radians

  17. DMR CONFIGURATION sidestepping limitations • DMR configuration permits a huge difference between the optical modulation and optical detection frequencies, without loss of phase information • Can use a stable, small area photodiode with low noise trans-impedance amplifier and 1kHz bandwidth to measure the phase shift on a 10GHz sensing beam

  18. DMR CONFIGURATION sidestepping limitations • 1 kHz photodiode can provide S/N ratio of 10,000 in a bandwidth of 0.5Hz with a rough surface at 10m, using a 1mW beam • Corresponding ranging accuracy  15m using 1GHz modulation • Achievable ranging accuracy  1m using 15GHz modulation

  19. ü ü Technology licensing Provisional patent filing Full patent filing ü Product development & marketing Laboratory validation Alpha models for key markets Consulting services COMMERCIALIZATION

  20. eagle ray corporation Contact: Dr. Andy Barker(403) 247-9939abarker@eagleray.ca

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