Statistics of dynamic speckles in application to distance measurements
- Resource Type
- Authors
- Serguei V. Miridonov; Dmitry V. Semenov; Ervin Nippolainen; Alexei A. Kamshilin; Igor S. Sidorov
- Source
- Optical Review. 16:160-166
- Subject
- Quantum optics
Physics
Accuracy and precision
Spatial filter
business.industry
ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION
Response time
Atomic and Molecular Physics, and Optics
Speckle pattern
Optics
Rough surface
Range (statistics)
business
Algorithm
Laser beams
- Language
- ISSN
- 1349-9432
1340-6000
We present an analysis of statistical properties of dynamic speckles to estimate the limiting accuracy of measurements achievable in a distance sensor using spatially filtered dynamic speckles. The main reason for inaccurate measurements using dynamic speckles is their stochastic nature. It is shown that the average lifetime of dynamic speckles is the key factor defining the measurement accuracy. Main conclusions of the theoretical analysis were confirmed in an experiment carried out with a fast moving rough surface. Special attention is paid to a recently proposed range sensor using dynamic speckles generated by a fast-deflecting laser beam. It is shown that this sensor possesses the best combination of accuracy and response time.