CN88203958U

CN88203958U - Photoelectric air pressure sensor

Info

Publication number: CN88203958U
Application number: CN 88203958
Authority: CN
Inventors: 孙德兴
Original assignee: Institute of Acoustics CAS
Current assignee: Institute of Acoustics CAS
Priority date: 1988-04-16
Filing date: 1988-04-16
Publication date: 1988-12-21

Abstract

The utility model discloses a sensor for measuring the air pressure, comprising a casing, a U-shaped tube and a liquid level detecting system. The U-shaped tube is provided with a transparent window, and the two sides of the transparent window are provided with photoelectric components. When the power is on, the utility model sends out an electrical signal. The signal can show the air pressure value through the process to the signal. The photoelectric air pressure sensor can do the long-range transmission, and the display of the electrical signal is combined with a computer. The monitoring and the automatic control at any time can be achieved. The utility model can carry out the air pressure monitoring and the dynamic air pressure measurement in the occasion with adverse environment and the occasion where the personnel can not enter.

Description

Photoelectric air pressure sensor

The utility model relates to a kind of sensor of measuring air pressure.

Measure atmospheric pressure, dual mode is arranged at present, a kind of is the U-shaped pipe barometer of interior water-filling silver, another kind is the pressure resistance type barometer, and the former is by naked-eye observation, can't with computer networking, and resolution is low (has only one millimeter, only be equivalent to 1.32 ‰ standard atmospheric pressures), the following 130pa that is limited to of latter's measurement range can provide electric signal, but temperature influence is bigger, must carry out temperature compensation, this barometrical production technology (especially sintering process and packaging technology) complexity, thereby cost height simultaneously.

The purpose of this utility model is that a kind of novel baroceptor will be provided, and it can avoid the influence of ambient temperature effectively, and exports high-resolution electric signal, can adapt to the dynamic air pressure monitoring again, and easily manufactured, with low cost.

The purpose of this utility model is to realize like this, on baroceptor U-shaped tube wall, leave the transparency window of slit, and make this window be positioned at the appropriate location that to observe U-shaped pipe liquid level, send photosignal by device in the photoelectricity liquid level recording geometry of transparency window both sides, thereby demonstrate the position of liquid level.Like this, because the liquid level change that air pressure change causes, liquid level change has caused the variation of output potential signal, through this signal is handled, promptly is expressed as atmospheric pressure value.Photoelectric subassembly shows liquid level position, and represent that with electric signal the principle of atmospheric pressure value is such: the infrared light that sends when infrared light source chip, when seeing through the intersegmental crack be full of certain medium when liquids and gases (transparent or opaque), it will exert an influence to the propagation of infrared light, because the difference of medium, its effect are also different.At the interface place of gas-liquid two-phase, this tittle will have a sudden change, and this tittle is converted to electric signal output, can realize like this, just having finished the purpose that shows air pressure with electric signal to represent the electric weight output of air pressure change with the variation of liquid level position.Chip because of photoelectric subassembly is very little again, as a point.Numerous chips equidistant line spread in accordance with regulations can satisfy desired highest resolution and maximum dynamic air pressure scope.

Simultaneously, this utility model has also increased the oblique incidence angle of light source, thereby makes Signal Processing more convenient.

The utility model is electric signal output because of changing naked-eye observation, thus can with computer networking, and can accomplish to monitor at any time.If be used for meteorological observation, can realize that each station delivers to zone center at any time with atmospheric pressure and handle; If be used for commercial production, can realize robotization control.Also owing to can transmit at a distance and electric signal shows, thereby realized to the Pressure monitoring under rugged surroundings and the inaccessiable poisonous environment of personnel, inflammable, the explosive environments and to the measurement at any time of dynamic air pressure.

The utility model is selected the liquid of little proportion for use as required, charges into the U-shaped pipe, when the proportion of liquid more hour, it is also just big more that it measures sensitivity.Because sensor has adopted the infrared electro assembly, strong interference immunity, so signal stabilization is reliable, response speed is fast, has avoided false wrong report.

Concrete structure of the present utility model is provided by following embodiment and accompanying drawing thereof:

Fig. 1 is the barometric pressure sensor structural drawing.

Fig. 2, Fig. 3 are dynamic air pressure sensor example structure figure.

Fig. 4 is bulk container and pipeline pressure reduction (poor with ambient pressure) sensor example structure figure.

Be illustrated respectively below:

Sensor shown in Figure 1 comprise a housing 6., be equipped with on the housing U-shaped pipe 2. fill in it with liquid 7., 4. the photoelectric subassembly housing of liquid level detection system be in U-shaped tube wall slit transparency window both sides 1..

U type pipe is made by metal or nonmetal rigid material, material can be transparent or nontransparent, when selecting non-transparent material for use, the transparency window that needs on its tube wall, to leave slit 1., this glazing, organic glass or transparent resin, plastics are manufactured; When selecting transparent material for use, then need the tube wall part blacking beyond the transparency window, with the interference of preventing stray light, 3. the A end closure of U-shaped pipe is vacuum chamber; 5. the B end opening is the pressure chamber that communicates with the external world, but needs stifled things such as filter paper to breathe freely, and falls into dust protection.

4. the photoelectric subassembly housing is gone up, and photoelectric subassembly is housed, wherein a ₁, a ₂, a ₃A _nBe the infrared light supply chip, b ₁, b ₂, b ₃B _nThe corresponding photodetector chips of infrared light detects the liquid level of U-shaped pipe A end with this, and a ₁', a ₂', a ₃' ... a _n' with b ₁', b ₂', b ₃' ... bn ' then is used for controlling the liquid level of B end.This liquid level position, two ends poor is the h value.If U-shaped tube cavity diameter is even, only get final product with one group of photoelectric subassembly, h value at this moment begins two times of decline (or rising) positions from zero point.

Liquid in the U-shaped pipe 7., can select organic or inorganic for use, its selection standard is that proportion is low, fusing point is low, boiling point is low, good fluidity, non-volatile, nontoxic, difficultly burn, not quick-fried, water-fast liquid all can, but, different stressing can be arranged for different application conditions.

Fig. 2, shown in Figure 3 be the dynamic air pressure sensor, be to be used for measuring by taking offence of producing of wind speed V pressing two example block diagram of △ P, because of △ P=KV ², K is a coefficient of combination, can be designed the dynamic pickup of different structure by user's difference requirement (as dynamic range and resolution).

Among Fig. 2: the air hole that 6. sensor housing is gone up (15), can discharge the pressure that moves generation behind the loudspeaker shell (11), the deformable body (14) of sensor U-shaped pipe, because it is little to make the big end of an end, thereby liquid level position is changed significantly the measuring accuracy height; Elastic film (13) can be manufactured by metal, rubber, latex etc., behind the internal-filling liquid body, under external force, very easily distortion; Diaphragm (12) is manufactured with light material, becomes one with (11), abuts against on the outstanding position of elastic film (13); The flexible fastening ring 10., has good elasticity, make (11) can only be along the direction displacement of wind speed V, the wherein long limit has determined the limit of the institute's wind speed V that surveys generation pressure reduction (dynamic pressure), 10. diameter also is in order to improve measuring accuracy greater than the diameter of (12), and these can be decided as requested.

Not existing together of Fig. 3 and Fig. 2 is that what to be born blast is not horn housing, but one fan-shaped light laminated (19), the end of fixed bar (17) has axle (18) to become hinge-coupled with thin slice (19).(19) the other end is diaphragm (12) fixedly, under the effect of wind speed V, (12) is acted on the elastic film (13), thereby can measure the difference force that wind speed produces.

The component names of sensor shown in Figure 4, label, material and function are with preceding identical, different is the liquid level position Q height in original state zero point to a certain moment, in fact, and because of U-shaped bore uniformity, only with one group of photoelectric subassembly, its real liquid level should be h=2Q.

Claims

1, a kind of sensor that is used to measure air pressure, by housing 6., 2. U-shaped pipe that liquid is housed form with liquid level detection system, it is characterized in that having on the U-shaped pipe transparency window of slit, liquid level detection system is contained in the both sides of transparency window.

2, by the described sensor of claim 1, the material that it is characterized in that the U-shaped pipe is metal or glass or rigidity plastics, is used for the blind end of the U-shaped container of dynamic air pressure sensor, adopts elastic membrane (13) to make.

3, by the described sensor of claim 1, it is characterized in that the transparency window on the said U-shaped pipe: for the U-shaped pipe of non-transparent material, its transparency window is to form with the transparent material sealing after opening slit on the tube wall of U-shaped pipe (1); (2) for the U-shaped pipe of transparent material, its transparency window then is partly to be coated with pitch-dark at staying slit U-shaped tube wall in addition to form.

4, by the described sensor of claim 1, it is characterized in that said liquid level detection system is made of photoelectric subassembly.

5, by claim 1 and 2 described sensors, it is characterized in that elasticity is equipped with the loudspeaker housing that light rigid materials is made on the said housing that is used for dynamic pickup, the small end of this loudspeaker housing presses closer on the elastic film of U-shaped duct occlusion end (13).

6, by claim 1 and 2 described sensors, it is characterized in that the said housing that is used for dynamic pickup, the fanning strip connecting rod (19) that light rigid materials is made also is housed, and, the small end of fanning strip is against on the elastic film (13) of U-shaped duct occlusion end by linkage.