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Femtosecond laser interference range finding system

A distance measurement system, femtosecond laser technology, applied in the field of femtosecond laser interference distance measurement system, can solve the problems of small measurement range, reduced measurement speed, limited repetition frequency tuning, etc., to avoid drift error, improve measurement speed, The effect of improving measurement accuracy

Active Publication Date: 2016-07-06
TSINGHUA UNIV
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Problems solved by technology

However, the problem with this method is that the repetition frequency needs to be constantly locked and unlocked during the experiment, which greatly reduces the measurement speed; in addition, due to the limited amount of repetition frequency tuning, the measurement range is small

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  • Femtosecond laser interference range finding system
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Embodiment Construction

[0015] The present invention will be described in detail below in conjunction with the accompanying drawings. However, it should be understood that the accompanying drawings are provided only for better understanding of the present invention, and they should not be construed as limiting the present invention.

[0016] Such as figure 1 As shown, the femtosecond laser interference ranging system provided by the present invention includes a femtosecond laser FL, a fiber coupler C 1 , fiber optic coupler C 2 , long fiber LF, collimating lens CL 1 , collimating lens CL 2 , beam splitter BS 1 , beam splitter BS 2 , corner reflector CR 1 , corner reflector CR 2 , plane mirror M, acousto-optic modulator AOM, band-pass filter F 1 , bandpass filter F 2 , Photodetector PD 1 , Photodetector PD 2 , Photodetector PD 3 , frequency counter, lock-in amplifier and signal processing system;

[0017] Femtosecond laser FL emits light pulses through fiber coupler C with an energy ratio...

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Abstract

The invention relates to a femtosecond laser interference range finding system which is characterized in that light pulse emitted by a femtosecond laser device is split by a first optical fiber coupler; a part of the light pulse emitted by the first optical fiber coupler is transmitted to a frequency counter through a first photoelectric detector; another part of the light pulse emitted by the first optical fiber coupler enters a second optical fiber coupler, a beam of the light pulse emitted by the second optical fiber coupler is emitted to a first light splitting mirror through a long optical fiber, the light pulse emergent out of the first light splitting mirror is transmitted to a first reflecting mirror, and the light pulse emitted by the first reflecting mirror is transmitted to a second light splitting mirror through the first light splitting mirror and a plane mirror; the light pulse emitted by the first light splitting mirror is transmitted to a second reflecting mirror, light emitted by the second reflecting mirror is transmitted to the second light splitting mirror through the first light splitting mirror and the plane mirror in turn; and another beam of the light pulse emitted by the second optical fiber coupler is transmitted to the second light splitting mirror, two beams of the light pulse emitted by the second light splitting mirror are received by the corresponding photoelectric detectors through a band-pass filter, and the output ends of the two photoelectric detectors are connected with a signal processing system through a phase-locked amplifier.

Description

technical field [0001] The invention relates to a laser distance measurement system, in particular to a femtosecond laser interference distance measurement system. Background technique [0002] With the rapid development of aerospace technology and advanced manufacturing and other industrial technologies, there is an urgent need for large-range, high-precision ranging technology. The traditional laser interferometric ranging technology is incremental ranging, which needs to set up guide rails between the baseline and the measured position, and the light cannot be cut off during the measurement process, which has high requirements for the measurement environment. Therefore, the traditional laser interferometric ranging technology has been unable to meet the ranging requirements of aerospace and large-scale manufacturing fields. Laser absolute distance measurement is a method to directly measure the distance between the baseline and the target object. It does not need to set ...

Claims

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Application Information

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IPC IPC(8): G01S17/08
CPCG01S17/08
Inventor 吴冠豪廖磊
Owner TSINGHUA UNIV
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