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Frequency modulation continuous wave laser ranging method with integrated FP etalon

A frequency-modulated continuous wave and laser ranging technology, applied in radio wave measurement systems, measurement devices, electromagnetic wave re-radiation, etc., can solve problems such as poor stability, unsatisfactory measurement accuracy, dispersion, etc., to achieve high-precision measurement and overcome the environment Sensitivity and Effects of Fiber Dispersion

Active Publication Date: 2019-01-15
HANGZHOU DIANZI UNIV
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Problems solved by technology

However, due to the inclusion of a long optical fiber as a measurement reference, its stability is poor, and there is dispersion phenomenon, resulting in unsatisfactory measurement accuracy

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  • Frequency modulation continuous wave laser ranging method with integrated FP etalon
  • Frequency modulation continuous wave laser ranging method with integrated FP etalon
  • Frequency modulation continuous wave laser ranging method with integrated FP etalon

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with drawings and embodiments.

[0025] The frequency modulation continuous wave laser ranging method integrating FP etalon, the specific steps are as follows:

[0026] Step 1, such as figure 1 As shown, a frequency-modulated continuous wave laser ranging system integrated with FP etalons is built. In the laser ranging system, the tunable laser controller 18 controls the tunable laser 1 to emit optical frequency linear modulation with a center wavelength of 633nm and a modulation range of 1nm. Laser, the laser passes through the optical isolator 2, the collimating lens group 3 and the half-wave plate 4 in sequence, and then passes through the polarization beam splitter 5 and is divided into two paths, respectively entering the measurement interference system and the FP interference system. In the measurement interference system, the laser light is divided into two paths by the non-polarizing beam spli...

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Abstract

The invention discloses a frequency modulation continuous wave laser ranging method with an integrated FP etalon. An optical fiber Mach-Zehnder interferometer is used as an auxiliary interferometry system to perform constant optical frequency interval resampling, one section of long optical fiber is contained and used as a measuring basis, stability is relatively poor, and a chromatic dispersion phenomenon exists. According to the method provided by the invention, in a frequency modulation continuous wave laser ranging system, the FP etalon is added as an auxiliary measuring system, sampled signals are subjected to constant optical frequency interval resampling, then, the resampled signals are processed through a Hilbert transformation algorithm, and thus, absolute distance of the measuredtarget is obtained. According to the method provided by the invention, cavity length of the FP etalon is taken as a ranging standard rather than the long optical fiber, environment sensitivity of thelong optical fiber and influence of chromatic dispersion of the optical fiber on ranging precision are overcome, and the method can realize measurement of higher precision under a condition where a laser modulation range is relatively small.

Description

technical field [0001] The invention belongs to the technical field of three-dimensional laser distance measurement, and in particular relates to a frequency modulation continuous wave laser distance measurement method integrating FP etalon. Background technique [0002] In recent years, frequency-modulated continuous wave laser ranging has received more and more attention in the field of laser ranging. It has the advantages of high measurement accuracy, absolute ranging, and direct measurement of diffuse reflection targets. The measurement accuracy of frequency-modulated continuous wave laser ranging is affected by the laser scanning range and laser scanning linearity. Therefore, it is necessary to use the equal optical frequency interval resampling method to process the obtained interference signal off-line to improve the measurement accuracy. At present, in order to use the equal optical frequency interval resampling method, a set of optical fiber Mach-Zehnder interferenc...

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Application Information

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IPC IPC(8): G01S17/32
CPCG01S17/32
Inventor 时光黑克非王文郑磊珏
Owner HANGZHOU DIANZI UNIV
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