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Method and system for measuring optical distance

A technology of optical distance and detection light, which is applied in the field of measuring optical distance, can solve problems affecting system cost, complexity and precision, difficulty in popularization and application, poor repetition frequency, etc., to achieve accurate distance, reduce complexity and cost, and measure distance Effect

Active Publication Date: 2014-07-16
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, this method reported in the world uses two independent lasers to generate pulsed light respectively. Since the optical cavities of the two light sources are independent of each other, the repetition frequency difference requires a precise feedback control system to lock, or it is easy to follow the external environment, etc. The change of the system will drift, so it will seriously affect the cost, complexity and accuracy of the system, and it is difficult to popularize and apply

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  • Method and system for measuring optical distance
  • Method and system for measuring optical distance
  • Method and system for measuring optical distance

Examples

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example 1

[0072] The principle of the multi-wavelength mode-locked laser used in this example to achieve multi-wavelength pulse output is to use the gain unevenness of the erbium-doped fiber to adjust the shape of the gain spectrum by controlling the loss in the cavity, so that the gains at different wavelengths are the same, and then realize Multi-wavelength mode-locked pulsed laser output. The structure of the laser is as Figure 5 As shown, the laser is a fiber passive mode-locked laser with a ring cavity structure. The pump light source is a semiconductor laser 503 with a wavelength of 1480nm, and the pump light emitted is coupled into a 5-meter-long Erbium-doped fiber (EDF) 501 through a 1480 / 1550 wavelength division multiplexer 502 . The absorption coefficient of the EDF 501 at 1530 nm is 6.1 dB / m. The EDF is connected to an optical isolator 508 to ensure that light propagates in one direction in the fiber cavity. A polarization controller 506 is added in the cavity to control ...

example 2

[0075] This example uses a dual-wavelength pulse laser with the same principle as Example 1. The output optical pulse of the dual-wavelength passively mode-locked fiber laser passes through the optical splitter, and the optical pulse component with a central wavelength of 1532.46nm and the optical pulse component with a central wavelength of 1547.43nm Divided into two independent outputs. One of the two optical pulses is used as a reference optical pulse sequence with a pulse width of 0.6 ps, and the other is used as a first detection optical pulse sequence with a detection optical pulse width of 1 ps. After the first detection light pulse sequence undergoes two different optical path delays in a transmission manner, the second detection light pulse sequence is synthesized. After adjusting the polarization state, the second detection light pulse sequence and the reference light pulse sequence become parallel beams, and after being focused by the lens, they converge on the seco...

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Abstract

The invention discloses a method and a system for measuring an optical distance. The method comprises the following steps of: outputting more than two optical pulse sequences with different center wavelengths and different repetition frequencies by a pulse laser; splitting the optical pulse sequences into a first detection optical pulse sequence and a reference optical pulse sequence by an optical splitter; generating a calibration pulse sequence by the first detection optical pulse sequence through a calibration optical path, generating a target pulse sequence by the first detection optical pulse sequence through a target optical path, and combining the calibration pulse sequence and the target pulse sequence into a second detection optical pulse sequence; measuring a time domain correlated signal generated between the reference optical pulse sequence and the second detection optical pulse sequence; and calculating a time difference between a target pulse in the second detection optical pulse sequence and the closest calibration pulse before the target pulse according to the time domain correlated signal so as to measure the optical distance difference of the target optical path and the calibration optical path. According to the method and the system, a distance can be accurately measured by utilizing a multi-wavelength pulse laser, therefore, the complexity and the cost of the system are reduced.

Description

technical field [0001] The invention relates to the field of optical distance measurement, in particular to a method and system for measuring optical distance. Background technique [0002] Optical distance measurement is an important technology for scientific research and industrial production. In recent years, due to the continuous development of science and technology, higher and higher requirements have been put forward for optical distance measurement. How to measure optical distance quickly and accurately has become an urgent problem to be solved. [0003] At present, the main method of optical path measurement is to transmit an optical signal to the target, and process the reflected, transmitted or scattered signal to calculate the optical path size. Existing optical path measurement methods mainly include non-interferometric and interferometric methods. [0004] Non-interferometric measurement is also called time-of-flight measurement. Its basic principle is to mea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J9/04
Inventor 郑铮赵欣关静宜刘磊刘娅
Owner BEIHANG UNIV