Scanning laser vibration measurement system

Abstract

The invention discloses a scanning laser vibration measurement system. A laser beam emitted by a laser passes through a first beam splitter prism to be split, where one path of the laser beam serves as local oscillator light for heterodyning detection to be reflected to a beam combiner through a reflection prism to be combined; the other path of the laser beam reaches a two-dimensional scanning control system through a first aperture, an AO modulator, a second aperture and a second beam splitter prism and then is emitted to a target, and scattered beams reach the beam combiner through the two-dimensional scanning control system and the second beam splitter prism to be combined with the local oscillator light; after the laser beams are combined, the combined laser beam reaches a signal processor through a third aperture, a polarization analyzer, a photoelectric detector and an intermediate frequency amplifier. The scanning laser vibration measurement system has the advantages that on the principle of heterodyning laser interference measurement, characteristics of vibration, speed and displacement of the target can be measured in a non-contact mode, and thus the scanning laser vibration measurement system is high in measurement precision and anti-interference capacity and the like; in the heterodyning detection, the design of receiving and transmitting integration and two-dimensional scanning measurement is adopted, and thus the scanning laser vibration measurement system is firm and compact in structure, convenient to measure and adjust and the like.

Description

technical field [0001] The invention relates to a measurement system, in particular to a scanning laser vibration measurement system, which belongs to the field of measurement technology. Background technique [0002] The existing measurement system mainly has the following problems: [0003] 1. The measurement distance is short, mostly within 30m; [0004] 2. The measurement vibration frequency range is narrow, mostly within 100 kHz; [0005] 3. Weak anti-interference ability, easily affected by ambient light; [0006] 4. The measurement accuracy is low. [0007] At present, optical detection mainly includes direct detection and heterodyne detection. The direct detection method has low measurement accuracy and poor anti-interference ability, while the heterodyne detection method has high measurement accuracy and strong anti-interference ability. However, the existing heterodyne measurement system usually detects an area of ​​the target or a point of the target, and does...

AI Technical Summary

Problems solved by technology

[0003] 1. The measurement distance is short, mostly within 30m;

[0004] 2. The measurement vibration frequency range is narrow, mostly within 100 kHz;

[0005] 3. Weak anti-interference ability, easily affected by ambient light;

[0006] 4. Low measurement accuracy

[0007] At present, optical detection mainly includes direct detection and heterodyne detection. The direct detection method has low measurement accuracy and poor anti-interference ability, while the heterodyne detection method has high measurement accuracy and strong anti-interference ability.

However, the existing heterodyne measurement system often detects an area of ​​the target or a point of the target, and does not have a scanning function. When changing the detection target or the detection target area, it is very difficult to adjust

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