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Vector microphone with horn structure

A microphone and vector technology, which is used in the measurement of propagation velocity, ultrasonic/sonic/infrasonic waves, instruments, etc., can solve the problems such as the difficulty of miniaturizing the size of the measuring device and the limited measurement range, so as to improve the sensitivity and improve the signal-to-noise ratio. Effect

Pending Publication Date: 2018-02-13
CHINA JILIANG UNIV
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Problems solved by technology

However, the indirect measurement method has certain limitations. The two microphones must meet the requirements of phase consistency, which also limits the measurement range.
In addition, in the indirect measurement method, the measurement frequency is related to the distance between the two microphones, and the distance between the microphones is required for low-frequency measurement, which makes it difficult to miniaturize the size of the measurement device.

Method used

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  • Vector microphone with horn structure
  • Vector microphone with horn structure
  • Vector microphone with horn structure

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Embodiment Construction

[0021] The present invention will be further explained below in conjunction with the drawings and embodiments

[0022] Such as figure 1 Shown: the present invention includes a support rod 3, in the upper end of the support rod is embedded MSM262S4737Z0A sound pressure microphone sensor 6 produced by MEMSensing company, on the adjacent two sides of the support rod are attached with x-directional bell mouth sensitive elements 2 and y respectively To the bell-mouth sensitive component 5, on the outside of the support rod is a protective cover 1 with protective effect, and under the protective cover is a circuit board compartment 4 where circuit components are placed.

[0023] When measuring, when sound waves act on the MEMS sound pressure microphone sensor, the sound pressure information can be directly measured through the circuit connection. When sound waves pass through the bell mouth and act on the sensitive components, the bell mouth sensitization structure will increase the spee...

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Abstract

The invention discloses a vector microphone with a horn structure. The vector microphone comprises a supporting rod, a sound pressure microphone is embedded in the upper end of the supporting rod, a sensitive element with a horn mouth in the x direction and a sensitive element with a horn mouth in the y direction are pasted on two adjacent sides of the supporting rod respectively and used for measuring vibration velocity information in each direction, and the horn mouths are used for increasing flow rate of sound waves. Sensitivity of a hot wire type vector sensor is improved by applying a horn mouth sensibilizing structure. A vector sensor sensitive unit structure based on a hot wire structure is provided, and a tandem type mirror image bridge pre-amplification circuit structure is applied, so that signal-noise ratio is increased.

Description

Technical field [0001] The present invention mainly relates to a new type of hot wire vector microphone, in particular to a vector microphone with a bell mouth sensitization structure. Background technique [0002] Acoustic measurement plays an extremely important role in industrial manufacturing, environmental testing and the development of the defense industry. Acoustic measurement can be applied to noise and vibration measurement, material property measurement, sound source localization, etc. [0003] The two basic physical quantities to obtain sound field information in acoustic measurement are sound pressure and particle velocity. The sound wave is the propagation of the vibration of the medium particle. When the particle in a fixed volume increases or decreases, it will cause the medium particle to move. Sound pressure can be seen as the result of an increase and decrease in the number of particles in a certain small volume instantaneously. Sound pressure is a scalar quant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H5/00G01H11/06
CPCG01H5/00G01H11/06
Inventor 郭世旭郝振宇赵鹏王月兵
Owner CHINA JILIANG UNIV
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