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Submillimeter-level linear tuning laser ranging system and signal processing method

A laser ranging, submillimeter-level technology, applied in the field of submillimeter-level linearly tuned laser ranging systems

Active Publication Date: 2013-05-29
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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  • Description
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  • Application Information

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Problems solved by technology

Although the wavelength varies linearly, the frequency c is the speed of light, the frequency must not change linearly, but because the frequency in the optical band is relatively high, the frequency can be approximately regarded as a linear change, and it can still be analyzed and processed according to the radar of ordinary chirp signals, but it must be added Appropriate non-linear frequency modulation error compensation, which is also the problem to be solved in this patent

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  • Submillimeter-level linear tuning laser ranging system and signal processing method
  • Submillimeter-level linear tuning laser ranging system and signal processing method
  • Submillimeter-level linear tuning laser ranging system and signal processing method

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[0116] The process of measuring the distance of the target by the submillimeter-level linearly tuned laser ranging system is divided into the following steps:

[0117] 1) Set the laser tuning frequency range and tuning speed, turn on laser 1, the laser adopts NewFocus semiconductor laser, the wavelength is 1550-1630nm, the maximum output power is 50mW1590nm, the line width is 30kHz (120μs delay), set the starting wavelength to 1550nm, stop The wavelength is 1560nm, the tuning rate is 20nm / s, the laser scanning is triggered, the laser tuning pulse (approximately chirped pulse) has a duration of 0.5s, and the wavelength changes as follows, the first 0.5s is a linear wavelength rise, and the next 0.5s is 1560nm The 0.5s linear wavelength decreases, and the subsequent 0.5s is a linear decrease to 1550nm, so it is a cycle. The output of the laser is laser light with a fixed polarization direction. The laser beam S output by laser 1 0 Divided into two parts by 90:10 fiber coupler ...

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Abstract

The invention discloses a submillimeter-level linear tuning laser ranging system and a signal processing method, which are applied to laser ranging. The submillimeter-level linear tuning laser ranging system comprises a linear tuning semiconductor laser, a 90:10 optical fiber coupler, an emitting collimating lens, a polarized beam splitter, a lambda / 4 wave plate, a receiving collimating lens, four 50:50 optical fiber couplers, two balance detectors, reference time-delay optical fiber, a data acquisition module and a signal processing program module. According to the submillimeter-level linear tuning laser ranging system disclosed by the invention, distance information of a target is obtained through calculation by adopting homodyne coherent detection and balance detection technologies and finally using a special signal processing program on a basis of large-scale linear tuning laser pulse signals; moreover, as the submillimeter-level linear tuning laser ranging system is mostly based on optical fiber devices, the system has the advantages of high stability, simple structure, high detection sensitivity, long operating distance and submillimeter-level ranging revolution.

Description

technical field [0001] The invention relates to laser radar technology, in particular to a submillimeter-level linearly tuned laser ranging system for ranging and a signal processing method thereof. Background technique [0002] The current lidar system can be divided into direct detection lidar and coherent detection lidar according to the echo detection method. Direct detection has a simple structure and is the most widely used, but it can only obtain the change of laser energy. This system calculates the distance by measuring the time delay (Δt) of transmitting and receiving optical signals c is the speed of light, but the resolution is about centimeters, and an avalanche photodiode with ultra-narrow emission pulse, high-speed sampling, and very high sensitivity must be used as a detector, which requires relatively high requirements for the device. Coherent detection uses continuous local oscillator optical signals and echoes to mix on the detector. The detection sensit...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S17/36
Inventor 张琨锋舒嵘徐显文凌元龙启强洪光烈胡以华
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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