CN203178021U - Pressure measuring system based on compensated-type micromanometer - Google Patents
Pressure measuring system based on compensated-type micromanometer Download PDFInfo
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- CN203178021U CN203178021U CN 201320148910 CN201320148910U CN203178021U CN 203178021 U CN203178021 U CN 203178021U CN 201320148910 CN201320148910 CN 201320148910 CN 201320148910 U CN201320148910 U CN 201320148910U CN 203178021 U CN203178021 U CN 203178021U
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Abstract
The utility model discloses a pressure measuring system based on a compensated-type micromanometer. The system comprises the compensated-type micromanometer, an image acquisition apparatus and a display apparatus, wherein the compensated-type micromanometer possesses a water box, an observation cylinder which is provided with a water level head and a reflecting mirror used to acquire reflection images of the water level head and an inner liquid level of the observation cylinder; the image acquisition apparatus is arranged at the position of the reflecting mirror so as to collect the reflection images from the reflecting mirror; the display apparatus is used to display the reflection images. According to the utility model, the image acquisition apparatus and the display apparatus are additionally arranged so as to observe a zero point liquid level. When the liquid level is at the ''zero point'' position, a distance between a head point of the water level head and an image point of a virtual image on the liquid level only has an error within a millimeter. Compared to the current identification based on human eyes, by using the system of the utility model, the human-induced error is greatly reduced; precision of the zero point can be effectively increased, which is good for accurate measurement.
Description
Technical field
The utility model relates to the pressure survey field, particularly relates to a kind of pressure-measuring system based on compensate-type micropressure meter.
Background technology
Compensate-type micropressure meter is mainly used in transmission, calibration and the test of noncorrosive gases slight pressure value, and it can measure malleation, negative pressure and the differential pressure of small gas.Compensate-type micropressure meter is based on the pressure measurement principle of U-tube manometer, and it is poor to form liquid-column height under pressure, and the change in displacement by container makes liquid level reach the liquid level equilibrium position again.Tested pressure P (handkerchief) can obtain according to following formula:
In the formula, h is instrument readout (millimeter); ρ is the density (kilograms per cubic meter) of liquid medium under the detected temperatures; ρ ' is atmospheric density under the testing environment (kilograms per cubic meter); G is detection site acceleration of gravity (rice/square second).
Fig. 1 shows the structural representation of existing compensate-type micropressure meter.Compensate-type micropressure meter generally comprises following components: fine setting part, level observation part, mirror portion and housing parts.
The water casket 106 that the trimming part branch comprises long bolt 104, is fixed on the fine tuning dish 101 on the long bolt 104 and moved upward or downward by long bolt 104 drives.Water casket 106 is provided with static pressure and connects and chew 105, connects at static pressure and chews 105 the accurate piece of indication (obviously not illustrating among the figure) is housed, and the accurate piece of indication is mobile in the middle of degree plate 103 and letter stencil 114, thus the displacement height of indication water outlet casket 106.
Level observation part comprises observation tube 115, and level 112 is housed in observation tube 115, is used for observation by dynamic pressure tube 110 liquid level variation in the back observation tube 115 that are stressed.
Mirror portion, comprise catoptron (obviously not illustrating among the figure), the head point of the level in the mirror surface reflection observation tube 115 112 and the image of liquid level, the head point of level 112 and the shadow point of its inverted image expression compensate-type micropressure meter reading that joins is adjusted to its " zero point " liquid level.
Housing parts comprises supporting the housing 102 of long bolt 104 air level 108 and set screw 113 being housed on the housing 102, is used for regulating the vertical of the long bolt 104 of microbarograph and dynamic pressure tube 110.
Wherein, water casket 106 is connected sebific duct 107 and links to each other with observation tube 115 usefulness, and after water casket 106 moved up, water casket 106 produced difference with liquid level between the observation tube 115, the impressed pressure source to observe pressurize in tins 115 after, liquid level reaches balance again.Compensate-type micropressure meter has higher accuracy and long-time stability preferably, is very suitable for being used in the transmission disjunction mark standard of minute-pressure section pressure magnitude.
But existing compensate-type micropressure meter when definite " zero point " liquid level, in the tube 115 of observation observation with the naked eye on the head point of levels 112 and its liquid level the shadow point of the virtual image " join ", personal error is bigger, is difficult to guarantee its accuracy.In addition, by aforementioned formula (1) as can be known, tested pressure P is that the density p according to atmospheric density ρ ' and liquid medium calculates, because the Media density temperature influence is very big, compensate-type micropressure meter is responsive especially to temperature variation.Atmospheric pressure and humidity change simultaneously also has certain influence to atmospheric density ρ '.If do not consider the influence of temperature, air pressure, humidity when test, the test result error is bigger.
The utility model content
The purpose of this utility model is one of above-mentioned defective that exists at prior art, provides a kind of error the little pressure-measuring system based on compensate-type micropressure meter.
To achieve these goals, the utility model provides a kind of pressure-measuring system based on compensate-type micropressure meter, comprise compensate-type micropressure meter, described compensate-type micropressure meter has the water casket, is provided with the observation tube of level head and is used for obtaining level head and the catoptron of observing the reflected image of liquid level in the tube; Described pressure-measuring system also comprises: image collecting device is arranged on described catoptron place, to gather the described reflected image from described catoptron; And display device, be used for showing described reflected image.
In one embodiment, described image collecting device can be industrial camera or digital camera head.
In one embodiment, described pressure-measuring system can also comprise the image processing apparatus that described reflected image is amplified processing; Wherein, described display device shows the described reflected image of handling through amplifying.
In one embodiment, described pressure-measuring system can also comprise: the environmental information harvester is used for the working environment information of the described compensate-type micropressure meter of collection in real time; And data processing equipment, according to the described working environment information of described environmental information harvester and the survey measurements calculating pressure measured value of described compensate-type micropressure meter.In one embodiment, described environmental information harvester can comprise: the temperature sensor of surveying work environment temperature; The humidity sensor of surveying work ambient humidity; And the baroceptor of surveying work ambient atmosphere pressure.
In one embodiment, described temperature sensor can comprise that being arranged on described observation tube place measures first temperature sensor of observing fluid temperature in the tube.Preferably, described temperature sensor can also comprise second temperature sensor that is arranged on fluid temperature in the described water casket place measurement water casket.
In one embodiment, described pressure-measuring system can also comprise output unit, is used for the described working environment information of output and described pressure measuring value.
In one embodiment, described display device can also be used for showing described working environment information and described pressure measuring value.
The utility model has following beneficial effect at least:
1) by setting up image collecting device and display device observation liquid level at zero point, can on display device, watch level head and the reflected image of observing liquid level in the tube easily, than directly observation with the naked eye, the utility model is easier determines the liquid level at zero point more exactly.
2) by setting up image processing apparatus, reflected image is amplified, make at definite zero point during liquid level, distance between the head point of level head and the shadow point of the virtual image on the liquid level only has the error of millimeter magnitude, identify by human eye than existing, greatly having reduced the people is the error that causes, can effectively improve the precision at zero point, is conducive to accurate measurement.
3) by increasing the environmental information harvester, according to the survey measurements calculating pressure measured value of temperature, humidity, pressure information and the compensate-type micropressure meter of real-time collection, the measuring accuracy and the accuracy that have effectively improved compensate-type micropressure meter.
4) than prior art, operation of the present utility model is simpler.And Information Monitoring and measurement result can directly be exported, and be very convenient.
Description of drawings
Fig. 1 shows the structural representation of existing compensate-type micropressure meter.
Fig. 2 shows the device connection diagram of the pressure-measuring system of an embodiment of the utility model.
Fig. 3 shows the device connection diagram of the pressure-measuring system of another embodiment of the utility model.
Embodiment
For the purpose, technical scheme and the advantage that make the utility model embodiment is clearer, below in conjunction with accompanying drawing specific embodiment is described in detail.
Fig. 2 shows the pressure-measuring system based on compensate-type micropressure meter of an embodiment of the utility model, comprises the compensate-type micropressure meter (not shown), image collecting device 201, image processing apparatus 202 and display device 203.Compensate-type micropressure meter in the utility model can be identical with compensate-type micropressure meter of the prior art, comprises fine setting partly, level observation part, mirror portion and housing parts.Image collecting device 201 can be arranged on the catoptron place of compensate-type micropressure meter, gathers the reflected image from catoptron.Image collecting device 201 can be industrial camera, also can be digital camera head.Image processing apparatus 202 is presented on the display device 203 after this reflected image is amplified processing.Image processing apparatus 202 can be existing image processing system.Display device 203 can be LCDs or LED display.Industrial camera can be gathered the reflected image from liquid levels in the level of catoptron 112 and the observation tube 115 in real time, reflected image through amplify handle after, be presented on the display screen.At needs compensate-type micropressure meter is carried out liquid level when zeroing, on display screen, to carrying out naked-eye observation through the reflected image that amplifies, judge whether the head point of level 112 and the shadow point of the virtual image on the liquid level join, thereby determine whether to be in the liquid level at zero point.By this operation, can so that zero point liquid level the error of millimeter magnitude is only arranged, this compares with complete distinguishing by human eye in the prior art, accuracy improves greatly.
In a unshowned embodiment, also can not comprise the image processing apparatus 202 among Fig. 2.Image collecting device 201 is gathered the reflected image from catoptron, and this reflected image directly is presented on the display device 203.In the observation of catoptron place, observe the restriction that be not subjected to observation angle and observation space at display screen than with the naked eye, make things convenient for the user to confirm the liquid level information at zero point of compensate-type micropressure meter.
Pressure-measuring system of the present utility model can also comprise the environmental information harvester, is used for gathering in real time the working environment information of compensate-type micropressure meter.In the embodiment shown in fig. 3, the environmental information harvester comprises first temperature sensor 204, second temperature sensor 205, the humidity sensor 206 of surveying work ambient humidity and the baroceptor 207 of surveying work ambient atmosphere pressure of surveying work environment temperature.First temperature sensor 204 can be arranged on observation tube 115 places, is used for measuring fluid temperature in the observation tube 115.Second temperature sensor 206 can be arranged on water casket 106 places, is used for measuring fluid temperature in the water casket 106.In other embodiment, first temperature sensor 204 or second temperature sensor 205 can only be set also.
In the embodiment shown in fig. 3, pressure-measuring system also can also comprise data processing equipment 208, according to the working environment information of environmental information harvester and the survey measurements calculating pressure measured value of compensate-type micropressure meter.Data processing equipment 208 can be provided by computing machine, also can be single-chip microcomputer.The pressure measuring value that can show working environment information and calculating in display device 203.In addition, also can also comprise output unit 209, be used for the pressure measuring value of output services environmental information and calculating.
Be example with embodiment shown in Figure 3 below, describe the method for the pressure-measuring system gaging pressure based on compensate-type micropressure meter of the present utility model in detail.
At first, compensate-type micropressure meter is initially returned to zero.Open image collecting device 201 and gather the reflected image of liquid levels in levels 112 and the observation tube 115, after image processing apparatus 202 amplifies, show in display device 203.The shadow point of the head point that the image that shows on the display device 203 comprises level 112 and its virtual image that forms at liquid level by the distance between observation head point and the shadow point, judges whether the sharp and shadow point of the head of level 112 joins.If both do not join, needing increases or reduces the water yield, allots fine tuning dish 101 and setting nut 111 then.When the head point of observing level 112 from display device 203 was tangent with its inverted image, the liquid levels in the observation this moment tube 115 were the liquid level at zero point.When calibration operation begins, with dynamic pressure tube 110 by external pressure source with joined by measuring pressure, under the pressure effect that external pressure source provides, liquid levels will rise or descend in the observation tube 115.Move, and then cause liquid level decline or rising in the observation tube 115 downward or upward by regulating long bolt 104 drive water caskets 106.Liquid level is regulated fine tuning dish 101 and setting nut 111 roughly near the liquid level at zero point in the observation tube 115 when pressure equilibrium, makes that liquid levels come back to the liquid level at zero point in the observation tube 115, reads the readout h of liquid level variation.Current temperature value t1, t2, humidity value rh and atmospheric pressure value p according to first temperature sensor 204, second temperature sensor 205, humidity sensor 206 and baroceptor 207 are gathered respectively determine fluid density ρ and atmospheric density ρ '.Wherein, fluid density ρ can search at the constant table under the different temperatures according to different medium and draw the mean value of the desirable t1 of temperature and t2.The available following formula of atmospheric density ρ ' calculates:
T=(t1+t2 wherein)/2.With the fluid density ρ under the Current Temperatures and according to atmospheric density ρ ' and substitution formula (1) that formula (2) obtains, can obtain pressure measurements comparatively accurately.
The above only is preferred implementation of the present utility model; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (9)
1. the pressure-measuring system based on compensate-type micropressure meter comprises compensate-type micropressure meter, and described compensate-type micropressure meter has the water casket, is provided with the observation tube of level head and is used for obtaining level head and the catoptron of observing the reflected image of liquid level in the tube; It is characterized in that, also comprise:
Image collecting device is arranged on described catoptron place, to gather the described reflected image from described catoptron; And
Display device is used for showing described reflected image.
2. pressure-measuring system according to claim 1 is characterized in that, described image collecting device is industrial camera or digital camera head.
3. pressure-measuring system according to claim 1 is characterized in that, also comprises the image processing apparatus that described reflected image is amplified processing; Wherein, described display device shows the described reflected image of handling through amplifying.
4. pressure-measuring system according to claim 1 is characterized in that, also comprises:
The environmental information harvester is used for the working environment information of the described compensate-type micropressure meter of collection in real time; With
Data processing equipment is according to the described working environment information of described environmental information harvester and the survey measurements calculating pressure measured value of described compensate-type micropressure meter.
5. pressure-measuring system according to claim 4 is characterized in that, described environmental information harvester comprises:
The temperature sensor of surveying work environment temperature;
The humidity sensor of surveying work ambient humidity; And
The baroceptor of surveying work ambient atmosphere pressure.
6. pressure-measuring system according to claim 5 is characterized in that, described temperature sensor comprises that being arranged on described observation tube place measures first temperature sensor of observing fluid temperature in the tube.
7. pressure-measuring system according to claim 6 is characterized in that, described temperature sensor also comprises second temperature sensor that is arranged on fluid temperature in the described water casket place measurement water casket.
8. pressure-measuring system according to claim 4 is characterized in that, also comprises output unit, is used for the described working environment information of output and described pressure measuring value.
9. pressure-measuring system according to claim 4 is characterized in that, described display device also is used for showing described working environment information and described pressure measuring value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320148910 CN203178021U (en) | 2013-03-28 | 2013-03-28 | Pressure measuring system based on compensated-type micromanometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320148910 CN203178021U (en) | 2013-03-28 | 2013-03-28 | Pressure measuring system based on compensated-type micromanometer |
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| Publication Number | Publication Date |
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| CN203178021U true CN203178021U (en) | 2013-09-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320148910 Expired - Fee Related CN203178021U (en) | 2013-03-28 | 2013-03-28 | Pressure measuring system based on compensated-type micromanometer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112197898A (en) * | 2020-11-02 | 2021-01-08 | 新疆维吾尔自治区计量测试研究院 | Compensation micro-pressure meter |
| CN114544078A (en) * | 2022-03-02 | 2022-05-27 | 黑龙江永创科技有限公司 | Self-calibration platform for calibrating compensation type micro-manometer and calibration method |
-
2013
- 2013-03-28 CN CN 201320148910 patent/CN203178021U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112197898A (en) * | 2020-11-02 | 2021-01-08 | 新疆维吾尔自治区计量测试研究院 | Compensation micro-pressure meter |
| CN114544078A (en) * | 2022-03-02 | 2022-05-27 | 黑龙江永创科技有限公司 | Self-calibration platform for calibrating compensation type micro-manometer and calibration method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130904 Termination date: 20210328 |