A Laser Ranging Method Based on Loop Frequency Measurement

A technology of frequency measurement and laser ranging, which is applied in measuring devices, radio wave measuring systems, electromagnetic wave reradiation, etc., can solve problems such as practical limitations, and achieve the effect of high-precision laser ranging

Active Publication Date: 2022-05-27
SHANXI UNIV
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  • Description
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Problems solved by technology

Although the measurement accuracy has been significantly improved, superconducting and optical comb technologies are used in the measurement process, which greatly limits the practicability of the above solutions
With the continuous improvement of people's requirements for ranging accuracy, the existing rangefinder can no longer meet the demand. Based on the above reasons, it is necessary to invent a convenient and high-precision laser ranging method

Method used

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  • A Laser Ranging Method Based on Loop Frequency Measurement
  • A Laser Ranging Method Based on Loop Frequency Measurement
  • A Laser Ranging Method Based on Loop Frequency Measurement

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Embodiment Construction

[0017] The device used in this embodiment is as follows figure 1 As shown in the figure, the pulsed laser (ID300) sends out a laser pulse signal through the fiber under test (used to replace the actual measured distance) and reaches the photodetector (DET08CFC). The detector is divided into two paths, one beam is used as the trigger signal for the next laser signal emitted by the pulsed laser, thereby forming a closed loop composed of the pulsed laser, the fiber under test, and the photodetector, and the other beam is composed of a time interval analyzer (GT658, time interval analyzer) Resolution 75ps) to detect and record each pulse arrival time, and obtain the pulse repetition frequency by Fourier analysis of the pulse arrival time. For better results, install a pulse signal amplifier between the photodetector and the beam splitter.

[0018] The present invention converts the measurement of time in the traditional laser ranging into the measurement of frequency. Since the t...

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Abstract

The present invention relates to pulse laser ranging technology. A laser ranging method based on loop frequency measurement, including a pulsed laser, a photodetector, a beam splitter, and a time interval analyzer. During the measurement process, the pulsed laser first emits laser pulses under the action of an initial trigger signal, and the photoelectric After receiving the laser pulse signal, the detector converts the laser signal into an electrical pulse signal and divides it into two identical pulse signals through a beam splitter. It has the characteristics of simple optical path structure, high measurement accuracy and strong practicability, and has potential application value in the fields of optical fiber device manufacturing and large workpiece shape measurement.

Description

technical field [0001] The invention belongs to the field of laser ranging, and relates to a pulse laser ranging technology, in particular to a laser ranging system based on loop frequency measurement. Background technique [0002] Laser ranging has the characteristics of long range, fast measurement speed and strong anti-interference ability, so it is widely used in engineering construction and other fields. In recent years, higher requirements have been placed on the absolute distance measurement of large range and high precision in the fields of optical fiber device production and large workpiece topography measurement. Common laser ranging schemes include time-of-flight method and continuous wave phase method. The ranging accuracy of the time-of-flight method is directly related to the measurement accuracy of the pulse time-of-flight. However, the time measurement accuracy in the actual system is limited by the time jitter caused by pulse distortion and thermal noise of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S17/10
CPCG01S17/10
Inventor 康舒婷杜李邵豆胡建勇高岩陈瑞云秦成兵张国锋肖连团贾锁堂
Owner SHANXI UNIV
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