CN1016732B - Pressure sensor of resistance-frequency type - Google Patents
Pressure sensor of resistance-frequency typeInfo
- Publication number
- CN1016732B CN1016732B CN 89102462 CN89102462A CN1016732B CN 1016732 B CN1016732 B CN 1016732B CN 89102462 CN89102462 CN 89102462 CN 89102462 A CN89102462 A CN 89102462A CN 1016732 B CN1016732 B CN 1016732B
- Authority
- CN
- China
- Prior art keywords
- resistance
- present
- pressure
- frequency
- integrator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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Abstract
The present invention relates to an R/f type pressure sensor which belongs to the field of instruments, meters and sensors. The present invention is mainly composed of a pressure sensitive element, an R/f converter and a shell body, wherein the R/f converter is composed of a measuring bridge, a differential amplifier, an integrator, a zero detector, a timer and a two-way electronic switch. The present invention has the advantages of strong capability of interference resistance, convenient remote transmission of signals, convenient direct digital display and microcomputer processing operation and high accuracy and resolution. The present invention can be applied to the dynamic and the static pressure measurement of gas and liquid, and the present invention is especially suitable for measurement and control systems of multi-point measurement, centralized detection and centralized control.
Description
The present invention is a kind of high precision, high resolution resistance frequency type pressure transducer, and it belongs to instrument and meter and sensor field.
Traditional resistive pressure sensor is not easy to long Distance Transmission owing to the analog quantity antijamming capability that output signal mostly is the millivolt level greatly is very poor; Lasting accuracy to supply voltage requires height, and the fluctuation of supply voltage directly has influence on measurement result; Precision and resolution are low, and linearity and stability are also relatively poor.Pressure transducer with frequency output, what come out in recent years both at home and abroad has various resonance type pressure sensors, as type vibration wire, vibration cylinder type, diaphragm-vibrating type, piezo-electric resonance type etc.This class pressure transducer has the common feature of frequency output transducer: precision height, resolving power height, antijamming capability are strong, and its shortcoming is complex structure, technological requirement height, and the pressure-frequency characteristic linearity is relatively poor.
China's patent 88213319.5 has proposed a kind of by pressure transducer, operational amplifier, voltage-frequency converter, " the digital pressure gauge of intermediate range " that amplification amplifier etc. are formed, it can convert the pressure signal of non electrical quantity to voltage signal, converts pulse duration frequency signal again to realize long-distance transmissions.But because the output frequency of its voltage-frequency converter will be subjected to the influence of factors such as operational amplifier enlargement factor and supply voltage, thereby advantages of higher stability and anti-interference can not be arranged.
The purpose of this invention is to provide a kind of both simple in structurely, have high precision and high-resolution pressure transducer again.
The present invention proposes a kind of novel pressure sensor of resistance-frequency type, the resistance variations that it can cause pressure is directly converted to frequency output.
Fig. 1 is the pressure sensor of resistance-frequency type structural representation, and as shown in the figure, this sensor mainly is made up of pressure-sensing device (1), resistance-frequency transducer (2) and housing (3) three parts.Paper tinsel formula foil gauge is pasted on elastic component one side, constitutes pressure-sensing device, and the resistance-frequency transducer is assembled on the miniature printed circuit board by electronic component, and the outside is a metal shell.Sensor is connected with pressure vessel or pipeline by threaded connector, and the resistance-frequency transducer is connected with pressure-sensing device.
The present invention has been owing to adopted the resistance-frequency transducer, thereby improved the performance of pressure transducer.Fig. 2 is resistance-frequency converter principle figure.As shown in Figure 2, the resistance-frequency transducer is made up of measuring bridge, differential amplifier (4), integrator (5), null detector (6), timer (7) and bidirectional electronic switch (8).Measuring bridge (is established R by foil gauge
2For measuring foil gauge) and resistance R
1, R
3, R
4Form, power by the 6V power supply.The output of electric bridge is connected with differential amplifier (4) input end, the output terminal of differential amplifier (4) is connected with integrator (5), the output terminal of integrator is connected with null detector (6), the output of null detector (6) is connected with the input of timer (7), the output of timer (7) is connected with bidirectional electronic switch (8), and this bidirectional electronic switch (8) is connected with measuring bridge.
The pulse height of output frequency signal of the present invention is 8～10V, in amplification and transmission course, do not drifted about substantially and noise effect, long-distance transmissions also can be eliminated interference by the regenerative amplification link of signal, pressure-frequency bias properties analysis according to actual measurement, it is non-linear, lag behind, repeatability, drift error is all less than 0.1%, its actual measuring accuracy is better than 0.3%, and resolution is better than 10
-4FS.That this sensor has is simple in structure, precision and resolution height, and antijamming capability is strong and be convenient to the advantage of remote transmission signal.It can be widely used in the dynamic and static pressure survey of gas, liquid, is specially adapted to multimetering, centralized detecting, central controlled TT﹠C system, is convenient to form the intelligent measuring instrument with microcomputer.
Fig. 3 is one embodiment of the present of invention circuit diagrams.Below in conjunction with embodiments of the invention invention is further described.As shown in the figure, measuring bridge is by resistance R
1, R
2, R
3, R
4(establish R
2For measuring foil gauge) form, the power supply of 6V power supply, when electric bridge was uneven, the voltage that a reflection of its output pressure changes was exported to differential amplifier and is amplified.Differential amplifier adopts ADS21 type high accuracy data amplifier, or is made up of 3 741 type operational amplifiers, and the signal after the amplification is given the integrator integration.Integrator is by high speed operation amplifier LM357(or LM318, F507) to form, its output is detected by null detector.Null detector adopts high speed voltage comparator (LM393 or LM319, LM710), when the integrator zero crossing, trigger action timer of null detector output, the monostable timer that is made of the LM555 chip is exported timing pip immediately and is removed to control bidirectional electronic switch, bidirectional electronic switch adopts CMOS chip CD4066 or CD4016, and its switching makes bridge output voltage change polarity.Resistance R in the circuit
0And R
tAdjust decision, R in the present embodiment by centre frequency and frequency deviation requirement
0Be 20K resistance, R
tBe 10K resistance.Entire circuit is by the power supply of ± 12V power supply, and what obtain at timer output end is the pulse signal of a frequency with change in pressure.
Claims (1)
1, a kind of pressure sensor of resistance-frequency type, it mainly is made of pressure-sensing device (1), housing (3) and transducer, it is characterized in that: converter using resistance-frequency transducer (2), resistance-frequency transducer (2) is connected with pressure-sensing device (1), and pressure-sensing device (1) is a paper tinsel formula foil gauge; The resistance-frequency transducer is by measuring bridge, differential amplifier (4), and integrator (5), null detector (6), timer (7) and bidirectional electronic switch (8) constitute, and the output of measuring bridge is connected with differential amplifier (4) input end; The output terminal of differential amplifier is connected with integrator (5); The output terminal of integrator (5) is connected with the input of null detector (6), and the output terminal of null detector (6) is connected with the input of timer (7); The output terminal of timer (7) is connected with bidirectional electronic switch (8); Bidirectional electronic switch (8) is connected with measuring bridge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89102462 CN1016732B (en) | 1989-10-19 | 1989-10-19 | Pressure sensor of resistance-frequency type |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89102462 CN1016732B (en) | 1989-10-19 | 1989-10-19 | Pressure sensor of resistance-frequency type |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1042605A CN1042605A (en) | 1990-05-30 |
| CN1016732B true CN1016732B (en) | 1992-05-20 |
Family
ID=4854735
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89102462 Expired CN1016732B (en) | 1989-10-19 | 1989-10-19 | Pressure sensor of resistance-frequency type |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1016732B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5024727B2 (en) | 2007-03-26 | 2012-09-12 | 日立工機株式会社 | Driving machine |
-
1989
- 1989-10-19 CN CN 89102462 patent/CN1016732B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN1042605A (en) | 1990-05-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C13 | Decision | ||
| GR02 | Examined patent application | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |