CN209044067U - A kind of high sensitivity infrasound sensor - Google Patents
A kind of high sensitivity infrasound sensor Download PDFInfo
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- CN209044067U CN209044067U CN201822228481.8U CN201822228481U CN209044067U CN 209044067 U CN209044067 U CN 209044067U CN 201822228481 U CN201822228481 U CN 201822228481U CN 209044067 U CN209044067 U CN 209044067U
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Abstract
The utility model discloses a kind of highly sensitive infrasound sensors, comprising: two parts of infrasonic sound reception device and film vibration optical fiber measuring device.Wherein, infrasonic sound reception device includes: ante-chamber and back cavity；Wherein, ante-chamber top surface is provided with air inlet, and the first opening and the second opening are equipped between ante-chamber and back cavity, first opening is provided with balance pipe, balance pipe is connected to ante-chamber with back cavity, and the second opening is provided with diaphragm, and the second opening is located in told back cavity and is equipped with fixed device.Film vibration optical fiber measuring device includes: optical fiber, coupler, optical detector and monochromatic source, and optical fiber one end is fixed by fixed device, and end face is parallel with diaphragm, and the optical fiber other end is pierced by from back cavity bottom surface and connects coupler.With the vibration information of optical measurement diaphragm, the high sensitivity of prominent optical interferometry displacement can measure the vibration of diaphragm nanoscale, can be realized the high sensitivity of infrasound sensor.
Description
Technical field
The utility model relates to the hypobarics such as upper atmosphere environment and planetary surface field of detecting more particularly to one
The highly sensitive infrasound sensor of kind.
Background technique
Deep space exploration especially has become the weight of the following space program to the detection of other planets of the solar system and its satellite
Want component part.Compared to the quietness of the moon, some planets and its satellite surface are because it is sound for having thin/dense atmosphere
There is using SoundRec and detect the possibility of these mysterious celestial bodies in the world.Martian surface Atmospheric components are carbon dioxide, air pressure
For 1000Pa or so, belong to hypobaric.20 kilometers of high-altitudes of earth surface are referred to as proximity space, and air pressure is in 1000Pa
Left and right and a hypobaric.Ground, the various natures in high-altitude and planetary surface or man induced event a lot can generate secondary
The vibration of sound, such as: volcano, hurricane, earthquake and nuclear blast etc., therefore be also a hot spot to the research of the acoustic intelligence in the space.
The density of gas is much lower compared under normal pressure in hypobaric, therefore in the case where same particle vibration amplitude,
The sound pressure of generation is also very low.And all acoustic detection at present is realized by induction acoustic pressure, therefore in low gas
Acoustic detector needs in pressure ring border are very highly sensitive, and the detection of infrasound signals is also such.
Current Infrasound detector is mainly capacitor Infrasound detector.Vibrating diaphragm and fixed polar plate form capacitor, when secondary
When sound causes diaphragm vibration, capacitor is caused to change, the variation by measuring this capacitor obtains the vibration information of diaphragm.This
The measuring diaphragm mode of vibration that kind of condenser type Infrasound detector uses there are sensitivity low, diaphragm vibration amplitude and capacitance variations line
The problems such as shape degree is low, these problems are especially serious in hypobaric, therefore are not able to satisfy and apply in hypobaric, need
A kind of diaphragm vibration measurement method of high sensitivity is wanted to measure the infrasound signals in hypobaric.
Utility model content
The purpose of this utility model is to provide a kind of highly sensitive infrasonic sounds being applicable in detection of infrasound in hypobaric
Detector promotes the detection of infrasound signals in the hypobarics such as upper atmosphere, planetary surface.
In order to achieve the above objectives, the utility model discloses a kind of highly sensitive infrasound sensors, comprising: secondary sound reception dress
It sets and two parts of film vibration optical fiber measuring device.Wherein,
Infrasonic sound reception device includes: ante-chamber and back cavity；Wherein, ante-chamber top surface is provided with air inlet, between ante-chamber and back cavity
Equipped with the first opening and the second opening, the first opening is provided with balance pipe, and balance pipe is connected to ante-chamber with back cavity, the second opening
Place is provided with diaphragm, and the second opening is located in told back cavity and is equipped with fixed device.
Film vibration optical fiber measuring device includes: optical fiber, coupler, optical detector and monochromatic source, and optical fiber one end passes through solid
Determine device to fix, and end face is parallel with diaphragm, the optical fiber other end is pierced by from back cavity bottom surface and connects coupler.
Preferably, diaphragm uses the material for having albedo to light, and the incident light for importing optical fiber reflects,
Since infrasound signals cause the vibration of diaphragm, and then change the light path of reflected light, reflected light and incident light are formed in optical fiber and done
Relate to light.
Preferably, the volume of different back cavities and/or the length and diameter of balance pipe are set, for measuring different frequency model
The infrasonic sound enclosed.
Utility model has the advantages that prominent optics is dry with the vibration information of optical interference chamber measurement vibrating diaphragm
The high sensitivity for relating to measurement displacement can measure the vibration of diaphragm nanoscale, can be realized the high sensitivity of infrasound sensor.
Detailed description of the invention
It, below will be to required use in embodiment description in order to become apparent from the technical solution for illustrating the utility model embodiment
Attached drawing be briefly described, it should be apparent that, the drawings in the following description are merely some embodiments of the present invention, right
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings
His attached drawing.
Fig. 1 is a kind of highly sensitive infrasound sensor structure chart of the utility model embodiment.
Specific embodiment
It is practical new below in conjunction with this to keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer
Attached drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that is retouched
The embodiment stated is the utility model a part of the embodiment, instead of all the embodiments.Based on the implementation in the utility model
Example, every other embodiment obtained by those of ordinary skill in the art without making creative efforts belong to
The range of the utility model protection.
Fig. 1 is a kind of highly sensitive infrasound sensor structure chart of the utility model embodiment, as shown in Figure 1.It include: time
Two parts of sound reception device and film vibration optical fiber measuring device.Wherein,
Infrasonic sound reception device includes: ante-chamber 1 and back cavity 2.Wherein, 1 top surface of ante-chamber is provided with air inlet 3, ante-chamber 1 and back cavity
The first opening and the second opening are equipped between 2, the first opening is provided with balance pipe 4, and balance pipe 4 connects ante-chamber 1 and back cavity 2
Logical, the second opening is provided with diaphragm 5, and the second opening is located in told back cavity 2 and is equipped with fixed device 6.
Film vibration optical fiber measuring device includes: optical fiber 7, coupler 8, optical detector 9 and monochromatic source 10,7 one end of optical fiber
It is fixed by fixed device 6, and end face is parallel with diaphragm 5,7 other end of optical fiber is pierced by from 2 bottom surface of back cavity and connects coupler 8.
The volume of different back cavities 2 and/or the length and diameter of balance pipe 4 are set, for measuring different frequency scope
Infrasonic sound.
Infrasound signals enter ante-chamber 1 through air inlet 3, and balance pipe 4 can keep 2 static-pressure uniform of ante-chamber 1 and back cavity, make simultaneously
Infrasonic sound pressure enters back cavity 2.The infrasonic sound pressure difference of ante-chamber 1 and back cavity 2 effect diaphragm 5 is allowed to vibrate with infrasound signals.Meanwhile it is single
The light that color light source 10 issues is by optical fiber 7 surface feeding sputtering to diaphragm 5, diaphragm 5 vibrates the distance for making diaphragm 5 arrive 7 end face of optical fiber
Change, and then change the light path of reflected light, make the reflected light of diaphragm 5 and incident light forms certain phase difference, reflected light with
Incident light forms interference light in optical fiber 7, and luminous intensity can change as the variation of phase is presented after interference.Measure interference signal
The frequency and amplitude of Strength Changes can obtain the vibration frequency and amplitude of diaphragm 5.
In a specific embodiment, sensor is arranged in the hypobaric environment in high-altitude and carries out time sound reception.
As shown in Figure 1.It include: two parts of infrasonic sound reception device and film vibration optical fiber measuring device.Wherein,
Infrasonic sound reception device is process using duralumin, comprising: ante-chamber 1 and back cavity 2.Wherein, 1 volume of ante-chamber is 60mL,
2 volume of back cavity is 350mL.Air inlet 3 is length 5cm, the silicone tube of diameter 3mm.Balance pipe 4 is length 8cm, diameter 2mm's
Silicone tube.
The central wavelength of monochromatic source 10 is 1550nm, and the end face of optical fiber 7 is parallel with diaphragm 5, and light reflectivity is all R=
4%, and then obtain interference light light intensity and be Wherein, R is reflectivity, and d is 5 He of diaphragm
The spacing of 7 end face of optical fiber, λ0The central wavelength of monochromatic source 10 is I0For light intensity of incident light.Diaphragm 5 is because vibration causes spacing
D changes, and then changes interference light light intensity.
The signal strength returned by spectrometer collection sensor obtains interference light light intensity, to obtain the vibration of diaphragm 5
Amplitude, the frequency of interference light intensity variation are the frequency that diaphragm 5 vibrates, the frequency of the infrasound signals as received.
The utility model provides a kind of highly sensitive infrasound sensor, believes with the vibration of optical measurement vibrating diaphragm
Breath, the high sensitivity of prominent optical interferometry displacement, can measure the vibration of diaphragm nanoscale, can be realized infrasonic sound sensing
The high sensitivity of device.
The upper atmosphere of earth surface 10KM or more is the hypobaric that air pressure is 1000Pa, is highly detrimental to sound wave
It propagates, the getable infrasound signals of institute are extremely faint, and the infrasound sensor on ground is not suitable for applying in hypobaric, need
To be suitable for the highly-sensitive detector of hypobaric.The highly sensitive infrasound sensor that this patent is related to can carry high-altitude
Balloon receives various infrasound signals near space.
Above specific embodiment has carried out further the purpose of this utility model, technical scheme and beneficial effects
It is described in detail, it should be understood that the above is only the specific embodiments of the utility model, is not used to limit originally practical
Novel protection scope, within the spirit and principle of the utility model, any modification, equivalent substitution, improvement and etc. done,
It should be included within the scope of protection of this utility model.
Claims (3)
1. a kind of high sensitivity infrasound sensor characterized by comprising infrasonic sound reception device and film vibration optical fiber measuring device
Two parts；Wherein,
The infrasonic sound reception device includes: ante-chamber (1) and back cavity (2)；Wherein, ante-chamber (1) top surface is provided with air inlet
(3), the first opening and the second opening are equipped between the ante-chamber (1) and back cavity (2), first opening is provided with balance pipe
(4), the balance pipe (4) is connected to ante-chamber (1) with back cavity (2), and second opening is provided with diaphragm (5), told back cavity
(2) it is located at second opening in and is equipped with fixed device (6)；
The film vibration optical fiber measuring device includes: optical fiber (7), coupler (8), optical detector (9) and monochromatic source (10), institute
It is fixed by the fixed device (6) to state optical fiber (7) one end, and end face is parallel with the diaphragm (5), optical fiber (7) other end from
Back cavity (2) bottom surface is pierced by and connects coupler (8).
2. sensor according to claim 1, which is characterized in that the diaphragm (5) has albedo using to light
Material since infrasound signals cause the vibration of diaphragm (5), and then changes for reflecting the incident light that optical fiber (7) import
The light path of reflected light, the reflected light and the incident light form interference light in optical fiber (7).
3. sensor according to claim 1, which is characterized in that the volume and/or balance pipe of different back cavity (2) is arranged
(4) length and diameter, for measuring the infrasonic sound of different frequency scope.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201822228481.8U CN209044067U (en) | 2018-12-27 | 2018-12-27 | A kind of high sensitivity infrasound sensor |
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| CN201822228481.8U CN209044067U (en) | 2018-12-27 | 2018-12-27 | A kind of high sensitivity infrasound sensor |
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| CN209044067U true CN209044067U (en) | 2019-06-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109471157A (en) * | 2018-12-27 | 2019-03-15 | 中国科学院声学研究所 | A kind of high sensitivity infrasound sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109471157A (en) * | 2018-12-27 | 2019-03-15 | 中国科学院声学研究所 | A kind of high sensitivity infrasound sensor |
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