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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Zhaoyun Zhang Yang Gao Xinghai Zhao Xiang Zhao |
| Copyright Year | 2009 |
| Description | Author affiliation: Institute of Electronic Engineering, China Academy of Engineering Physics, Mianyang 621900, China (Zhaoyun Zhang; Yang Gao; Xinghai Zhao; Xiang Zhao) |
| Abstract | Laser self-mixing interferometry is a new method proposed for measuring velocity of a moving target. When the optical beam is back-scattered into the active cavity, laser output power and frequency are modulated. By signal processing, the Doppler frequency can be acquired, and the target's velocity can be calculated. Based on these properties, a low-cost interferometry velocity sensor can be designed. In order to know whether the Laser Diode (LD) Self-Mixing (SM) velocimeter is suitable for high speed (km/s) scene, the high speed measurement by LDSM is analyzed in theory and the simulation is processed. Based on the three-mirror cavity model, relations of the laser output power's frequency fluctuations and Doppler frequency are acquired. External optical feedback is regarded as laser's small-signal modulation by the Doppler frequency. From rate equations of the carrier density and the photon density, following conclusions is acquired: LDSM velocimeter's maximum measurable velocity (MMV) is restricted by laser's relaxation resonant frequency in principle; LDSM velocimeter's MMV goes up to kilometers per second theoretically; When the LD's modulation speed satisfies request, LDSM interferometry can be used to measure high speed and the measurement precision is very high. The result is available to use the self-mixing technique to develop high performance, small overall dimensions and low cast instruments to measure high speed. |
| File Size | 103933 |
| File Format | |
| ISBN | 9781424438631 |
| DOI | 10.1109/ICEMI.2009.5274458 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2009-08-16 |
| Publisher Place | China |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Optical interferometry laser diode Density measurement interferometry Laser feedback Self-mixing Frequency measurement Laser theory Power lasers Diode lasers Velocity measurement Optical modulation Power generation |
| Content Type | Text |
| Resource Type | Article |
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