Small Angle Measurement in a Turbulent Environment Using Position-Sensitive Detectors

  • Anssi J. Mäkynen
  • Juha T. Kostamovaara
  • Risto A. Myllylä
Part of the Microprocessor-Based and Intelligent Systems Engineering book series (ISCA, volume 9)


A LEP and a 4Q position-sensitive detector are evaluated in terms of resolution. The properties of the detectors are examined by calculating the theoretical system noise equivalent power (SNEP) for both and comparing the results with measured values. The SNEP of the 4Q detector is shown to be about 30 times lower than that of the LEP. The theoretical SNEP of the 4Q detector is increased by the background radiation in an outdoor environment, but is still 6… 15 times lower than that of the LEP. The inherent sensitivity of the 4Q detector in turbulent environment is corrupted by the turbulences, and the resolution of the LEP is 8… 25 times better. Turbulence sensitivity is not inherent to a 4Q detector, but is due to the defocusing needed to achieve a certain measurement span.


Noise Source Shot Noise Light Spot Detector Surface Turbulent Environment 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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  1. 1.
    Kostamovaara, J., Mäkynen, A., Myllylä, R., “Method for Industrial Robot Tracking and Navigation Based on Time-of-flight Laser Rangefinding and Position Sensitive Detection Technique”, SPIE vol. 1010, Industrial Inspection, pp.92–99, Hamburg, 1988.Google Scholar
  2. 2.
    Pieskä, S., Mäkynen, A., Kostamovaara, J., Elsilä, M., Myllylä, R.,“Bulldozer Tracking and Navigation Using Servo-controlled Laser Rangefinding Technique”, Proc. 6th International Symposium on Automation and Robotics in Construction, San Francisco, Califomia,1989.Google Scholar
  3. 3.
    Moring, I., Myllylä, R., Honkanen, E., Kaisto, I., Kostamovaara, J., Mäkynen, A., “New 3D-vision Sensor for Shape Measurement Applications”, SPIE vol. 1194, Optics Illumination, and Image Sensing for Machine Vision IV, Philadelphia, 1989.Google Scholar
  4. 4.
    Mäkynen, A., Kostamovaara, J., Myllylä, R., “Position Sensitive Detector Applications Based on Active Illumination of a Cooperative Target”, EURISCON ‘81, Corfu, Greece,1991.Google Scholar
  5. 5.
    Mäkynen, A., Kostamovaara, J., Myllylä, R., “Position Sensitive Detection Technique for Manufacturing Accuracy Control”, SPIE vol. 1194, Optics, Illumination, and Image Sensing for Machine Vision IV, Philadelphia,1989.Google Scholar
  6. 6.
    Young, P., Germann, L., Nelson, R., “Pointing, Acquisition, and Tracking Subsystem for Space-based Laser Communications”, SPIE vol. 616, Optical Technologies for Communication Satellite Applications, 1986.Google Scholar
  7. 7.
    Walter, J.F., “Prospects for Precision Active Tracking Using a Quadrant Detector”, report no. APL/JHU TG 1290, The John Hopkins University, Applied Physics Laboratory, 61 pp., 1976.Google Scholar
  8. 8.
    Weichel, H., “Laser Beam Propagation in the Atmosphere”, SPIE vol. TT 3, 98 pp., 1990.Google Scholar
  9. 9.
    “Active Optical Seeker”, Final Report, Martin Marietta Aerospace Orlando Division, Orlando, Florida, June 1974.Google Scholar
  10. 10.
    “Journal of Soviet Laser Research”, vol. 8 (4), Consultants Bureau, New York, 1987.Google Scholar

Copyright information

© Springer Science+Business Media Dordrecht 1991

Authors and Affiliations

  • Anssi J. Mäkynen
    • 1
  • Juha T. Kostamovaara
    • 1
  • Risto A. Myllylä
    • 2
  1. 1.Electronics LaboratoryUniversity of OuluOuluFinland
  2. 2.Technical Research Centre of FinlandElectronics LaboratoryOuluFinland

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