Diffuse reflection type double-light-path air vibration detection system and method
A technology of air vibration and detection system, applied in measuring devices, using optical devices, using wave/particle radiation, etc., can solve the problems of not considering the characteristics of vibration sources, difficult air vibration detection, etc., to eliminate instability, efficient and stable detection. Effect
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Embodiment 1
[0040] The invention utilizes the timing characteristics of the vibration of the voice signal in the air when it propagates on the surface of the flexible object, combines the dual optical path heterodyne detection technology to obtain the first-order differential signal of the voice vibration signal, and finally restores the voice vibration signal through time integration.
[0041] Based on the above-mentioned principles, the diffuse reflection type dual optical path air vibration detection system in the embodiment of the invention, such as figure 1As shown, it includes an infrared laser 1, an infrared collimating mirror 2, an infrared 45° semi-transparent mirror 4, a first infrared 45° reflector 3, a flexible object 11, an infrared filter 5, and a second infrared 45° reflection mirror 6, infrared convex lens 7, infrared detector 8, digital oscilloscope 9 and vibration signal post-processor 10;
[0042] The infrared light emitted by the infrared laser 1 passes through the inf...
Embodiment 2
[0049] like figure 2 As shown, this embodiment provides a diffuse reflection dual optical path air vibration detection method based on the above detection system, including the following steps:
[0050] S1. Infrared light is emitted through an infrared laser, and after being collimated by an infrared collimator, a parallel beam is formed and emitted to an infrared 45° half-transparent mirror;
[0051] S2. The parallel light beam is transmitted and reflected through the infrared 45° half-mirror. The transmitted light obtained by the transmission treatment is emitted to the point B of the flexible object, and the reflected light obtained by the reflection treatment is reflected by the first infrared 45°. Point A of the flexible object is irradiated after mirror reflection;
[0052] S3, based on the vibration signal S(t) generated by driving the air vibration signal S(t) on points A and B on the flexible object A ) and S(t B ), make the diffuse reflection light on the A point...
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