Double Michelson interferometer type sound detecting sensor

Abstract

The invention discloses a double Michelson interferometer type sound detecting sensor, which comprises a probe, a dust shield, a bottom plate, a prism, a reflecting mirror, a substrate, a C-Lens optical fiber collimating lens, an optical cable and a diaphragm, wherein the probe adopts the structure of a solid revolution body, one end of the probe is provided with a flange used for sleeving the dust shield, and the flange is provided with a coaxial through hole used for installing the diaphragm; the other end of the probe is provided with a cross-shaped step groove, the prism used for reflecting and splitting light is adhered at the bottom end of the cross-shaped step groove, the reflecting mirror is adhered on the side wall of the cross-shaped step groove, the substrate is fixedly connected at a step of the cross-shaped step groove, the C-Lens optical fiber collimating lens penetrates through the substrate, and the bottom plate and the optical cable are fixedly connected and then installed at the other end of the probe together. The double Michelson interferometer type sound detecting sensor realizes accurate detection for weak sound signals in a complex environment through the cooperation of the probe, the dust shield, the bottom plate, the prism, the reflecting mirror, the substrate, the C-Lens optical fiber collimating lens, the optical cable and the diaphragm, and makes upthe defects of weak anti-electromagnetic environment ability and low detection sensitivity of the traditional acoustic sensors.

Description

technical field [0001] The invention relates to a double-Michelson interference type acoustic sensor, which belongs to the technical field of photoacoustic spectrum detection and analysis. Background technique [0002] In recent years, Michelson interferometry is mostly used to detect the periodic displacement caused by the vibration of the diaphragm caused by the acoustic signal. By establishing the relationship between the periodic interference light intensity signal and the diaphragm displacement signal, the original acoustic signal is measured. With the continuous development of science and technology, acoustic sensors have been widely used in industries, mines, environment, transportation and other fields. The application of acoustics has also received more and more attention, and the demand for sound measurement in special environments is increasing. [0003] Photoacoustic detection technology based on acoustic measurement is also developing day by day. Photoacoustic ...

AI Technical Summary

Problems solved by technology

[0008] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art, the present invention provides a double Michelson interference type acoustic sensor, through the probe, dust cover, base plate, prism, reflector, substrate, C-Lens optical fiber The cooperation of collimating lens, optical cable and diaphragm realizes the accurate detection of weak acoustic signals in complex environments, making up for the shortcomings of traditional acoustic sensors that are weak in anti-electromagnetic environment and low in detection sensitivity

Images