High-precision frequency-modulated continuous-wave laser ranging system based on f‑p etalon
A frequency-modulated continuous wave and laser ranging technology, applied in the field of optics, can solve problems such as low accuracy, and achieve the effect of improving the accuracy of ranging
Active Publication Date: 2017-11-24
HANGZHOU DIANZI UNIV
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Problems solved by technology
However, the existing FM continuous wave ranging system uses the length of the optical fiber as a reference, which is greatly affected by factors such as external temperature and vibration, resulting in low accuracy.
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[0014] The technical solution of the present invention will be further described below in conjunction with the drawings and specific embodiments.
[0015] Such as figure 1 As shown, the high-precision frequency modulated continuous wave laser ranging system based on FP etalon includes a tunable laser 1, a measuring interference system, a splitter 2, a beam splitter 4, a first photodetector 11, a host computer 14, and synchronous sampling System 15, FP etalon 16, second photodetector 17, third photodetector 18, and Mach-Zehnder interference system 19; the narrow linewidth frequency-modulated continuous wave laser emitted by the tunable laser 1 through the optical frequency linear modulation passes through the branch The device 2 is divided into two channels A0 and B0. Among them, the B0 channel enters the Mach-Zehnder interference system 19, the A0 channel is divided into two channels A1 and A2 by the beam splitter 4 after the collimating lens 3, and the A1 channel enters the measu...
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The invention discloses a high-precision frequency-modulation continuous wave laser ranging system based on an F-P etalon. An existing frequency-modulation continuous wave ranging system takes an optical fiber length as a reference and is greatly influenced by the outside world. In the invention, a laser emitted by a tunable laser is divided into two A0 and B0 paths via a demultiplexer. The B0 path enters into a Mach-Zehnder interference system. The A0 path is divided into two A1 and A2 paths via a beam splitter prism. The A1 path enters into a measurement interference system. The measurement interference system and a first photoelectric detector detect a detected reflecting prism so as to generate an interference signal. After the A2 path of laser and the F-P etalon generate interference, a second photoelectric detector detects and acquires the interference signal. The B0 path of laser and the Mach-Zehnder interference system generate the interference, and a third photoelectric detector detects and acquires the interference signal. A synchronous sampling system sends three paths of synchronous sampling signals to an upper computer so as to process and acquire a detected target distance. By using the system of the invention, an influence of an extraneous factor on an optical path difference of two interference arms of the Mach-Zehnder interference system is eliminated.
Description
Technical field [0001] The invention belongs to the field of optical technology, and specifically relates to a high-precision frequency-modulated continuous wave laser ranging system based on an F-P etalon. Background technique [0002] Since the birth of lasers, it has been used in the field of distance measurement. The characteristics of lasers such as good directionality, high brightness, and good monochromaticity determine its unique advantages in the field of measurement. In topographic surveying, space technology, military fields and engineering surveying, the introduction of laser surveying technology has continuously increased the measurement range, continued improvement in measurement accuracy, and continued innovation in measurement methods. Laser measurement has always been a hot research topic in the measurement field. [0003] Frequency modulated continuous wave (FMCW) laser ranging is an interferometric large-size laser absolute ranging technology. It has the advantag...
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IPC IPC(8): G01S17/32
CPCG01S17/34
Inventor 时光王文范绪银范宗尉
Owner HANGZHOU DIANZI UNIV