CN1106537A - Pressure measuring device - Google Patents
Pressure measuring device Download PDFInfo
- Publication number
- CN1106537A CN1106537A CN 94101230 CN94101230A CN1106537A CN 1106537 A CN1106537 A CN 1106537A CN 94101230 CN94101230 CN 94101230 CN 94101230 A CN94101230 A CN 94101230A CN 1106537 A CN1106537 A CN 1106537A
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- pressure
- measuring cell
- housing
- electrically connected
- sensing device
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- Measuring Fluid Pressure (AREA)
Abstract
The pressure meter is composed of shell, pressure sensing device generating signal reflecting pressure value, oscillator with output frequency variable with the signal, processing unit generating digital signal according to frequency, and display indicating pressure reading. It features less elements, low power and elimination of iinterference.
Description
The present invention relates to a kind of measuring cell, refer to a kind of measuring cell of fluid pressure especially.
Traditional measuring cell as shown in Figure 1, wherein this converter (transducer) is to use four piezoresistances (piezoresistor) to be electrically connected into Wheatstone bridge (Wheatstone bridge), as shown in Figure 2.Its principle is to utilize the film of converter to bear hydrodynamic pressure, during piezoresistance pressurized on its film, resistance 11 increases (or minimizing) with the resistance of resistance 13, resistance 12 reduces (or increasing) with the resistance of resistance 14 simultaneously, and produce a voltage difference at end points 15 and 16 of end points, cause the output of an aanalogvoltage signal.This analog signal enters analog/digital converter (A/D converter) 22 after amplifier 21 amplifies signal, it converts analog signal to digital signal.This pressure-dependent digital signal leads to a suitable electronic-controlled installation, i.e. a microcontroller circuit (CPU) 23.This CPU23 is controlling the operation of driver (driver) 24, and this driver 24 promptly converts this digital signal to be presented on the display (display) 25 pressure reading.
When reaching the maximum pressure detected value, " can hear signal device " (audible signal device) 28 will send the sound in order to remind.
In addition, this manometric power supply is provided by battery, and the control of power supply is finished by 26 of power control circuits (power control circuit), this power control circuit one end is electrically connected in battery, and it is operated by CPU23, and utilize internal transmission bus (bus) 27, power supply is sent to each device.
Known measuring cell is all " simulation is to numeral " formula circuit, the output that it utilizes piezoelectric transducer device to get relative voltage by hydrodynamic pressure, and promptly analog signal utilizes A/D converter that analog signal is converted to digital signal again.The not only much more circuit part of this kind mode, cost of idleness, and signal to convert the digital signal time error to by analog signal bigger, this is traditional manometric shortcoming.
The object of the present invention is to provide: " numeral is to numeral " formula measuring cell, need not use A/D converter, direct reference frequency modulation technique converts the variation of hydrodynamic pressure the variation of oscillation frequency to by containing pressure-sensing device at interior oscillator circuit, obtains the signal of digital form.
The present invention includes: a measuring cell housing: a pressure-sensing device, it is located in this housing, reacting a certain hydrodynamic pressure, and produces a signal; One oscillatory circuit, it is located in this housing, and is electrically connected in this pressure-sensing device, it according to this signal to change its oscillation frequency; One treating apparatus, it is located in this housing, and the gas that is electrically connected is connected to this oscillatory circuit, and it produces digital signal according to the oscillation frequency of this change; One display device, it is located in this housing, and is electrically connected in this treating apparatus, and it demonstrates pressure reading according to this digital signal; One switch, it is located in this housing, and an end is electrically connected in this treating apparatus, and the other end can be in order to be electrically connected in a power supply.
Certainly, pressure-sensing device of the present invention is a Silicon pressure sensor (silicon pressure sensor), promptly one or one the series connection piezoresistance, or be a piezoelectric crystal transducer (piezoelectric crystal transducer), or be a capacitive pressure sensing/converter (capactitive pressuresensor/transducer).Utilize the variation of piezoelectric electro resistance, or the variation of piezoelectric crystal nature oscillation frequency, or the variation of capacitor's capacity, to change the frequency of oscillatory circuit.
Certainly, oscillatory circuit of the present invention is an oscillator or waveform generator.Wherein this oscillator system is made up of pressure-sensing device and active/passive element.Its active component can be transistor, field-effect transistor (FET), operational amplifier (OP), comparer, logical integrated circuit phase inverter (logic IC inverter), or Shi Mitemen (Schmitt gate), the timing IC " NE 555/556 " or the function generator of more vairable " ICL 8038 " etc.
Certainly, treating apparatus of the present invention is a micro computer integrated circuit (microcomputer IC), that is CPU (central processing unit) (CPU), it measures the frequency/period output of oscillatory circuit, and convert relative force value to, and in display device, promptly LCD (LCD) goes up and shows pressure reading.
As above the present invention of Gou Chenging not only omits many devices, reduces cost, and can obtain pressure reading more accurately.
The present invention can be with following diagram and detailed description and is obtained preferable understanding:
Fig. 1: be known measuring cell calcspar;
Fig. 2: be known converter synoptic diagram;
Fig. 3: the piezoresistance that is Silicon pressure sensing apparatus of the present invention is formed synoptic diagram;
Fig. 4: the enforcement illustration that is typical oscillatory circuit of the present invention;
Fig. 5: be measuring cell calcspar of the present invention.
The present invention system places oscillation circuit as shown in Figure 4 pressure-sensing device.It utilizes piezoresistance or piezoelectric crystal or capacitive character pressure sensor to bear hydrodynamic pressure and makes the oscillation frequency change.
With piezoresistance as pressure-sensing device, it is connected into piezoresistance as shown in Figure 3, dotted portion is the film that bears hydrodynamic pressure, (or (film shape can be made as circular or square the pressurized direction to go out paper in order to go into paper, resistance in the film can be one to four series connection or a plurality of series connection, and it is decided on required Standard resistance range.When film is caved inward by hydrodynamic pressure, piezoresistance pressurized and being out of shape, if be concatenated into shown in Fig. 3 (a) and (b), its resistance reduces, if be concatenated into Fig. 3 (c), (d) shown in, its resistance increases.Generally be that piezoresistance is concatenated into Fig. 3 (a), shape (b), because of the corresponding curve of its resistance of piezoresistance, more linear when low pressure values with pressure.
Shown in Fig. 4 (a), when producing change in resistance when Silicon pressure sensor 30 pressurizeds, the time constant RC value of oscillation circuit also changes thereupon, RC value one changes, the output frequency of oscillation circuit also changes, so, also have one with the different digital signals generations that produce different frequency of pressure.
Simultaneously, if pressure-sensing device is the piezoelectric crystal 31 shown in Fig. 4 (b), it places oscillation circuit, and during these piezoelectric crystal 31 pressurizeds, former constant natural oscillation frequency promptly changes, and obtains a digital signal.
The used pressure-sensing device of Fig. 4 (c) is a capacitive character pressure sensor 32, and the change that it utilizes appearance value behind the electric capacity pressurized changes its time constant RC value, the output frequency of oscillation circuit is changed, and produce a digital signal.
Oscillatory circuit of the present invention can use Wei grace bridge oscillators (Wien bridge Oscillator), RC phase shift oscillator (RC phase shift Oscillator), astable multivibrator (astable multivibrator), the sine-wave producer (sine wave generator) that shaping circuit is arranged, digital signal compositor (digital signal synthesizer), or other can change the oscillator of its output frequency because of the impedance variation of pressure-sensing device.
Fig. 5 is a measuring cell calcspar of the present invention, and the digital signal that this oscillatory circuit 35 is produced enters treating apparatus, and promptly among micro computer IC and the CPU36, this CPU 36 can be by frequency or cycle, measure the frequency output of this oscillatory circuit 35.Through its inner operation program software, convert this frequency output to pressure reading, again to be presented on the LCD (LCD) 37.
The present invention is better than traditional manometric place, is directly to convert the pressure of suffered fluid to frequency output that i.e. digital form signal becomes pressure reading to be presented on the LCD cycle or the frequency inverted of this signal by CPU again.Employed A/D converter and perimeter circuit and part when this invention can be saved traditional measuring cell and needed to convert digital signal to because of the analog signal that pressurized produced, and a digital circuit completely.It not only consumes less power and uses less part, and can exempt noise to disturb and the more infallible pressure reading of supply.
The present invention according to as above disclosing for the those skilled in the art in this area, can make various modifications to its specific embodiment, but all not break away from the determined protection domain of appended claims.
Claims (10)
1, a kind of measuring cell, it comprises:
One measuring cell housing:
One pressure-sensing device, it is located in this housing, reacting a certain hydrodynamic pressure, and produces an electric signal;
One oscillatory circuit, it is located in this housing, and is electrically connected in this pressure-sensing device, and it changes its oscillation frequency according to described electric signal;
One treating apparatus, it is located in this housing, and is electrically connected in this oscillatory circuit, and it produces digital signal according to the oscillation frequency of described change;
One display device, it is located in this housing, and is electrically connected in this treating apparatus, and it demonstrates pressure reading according to this digital signal; And
One switch, it is located in this housing, and an end is electrically connected in this treating apparatus, and the other end can be in order to be electrically connected in a power supply.
2, measuring cell as claimed in claim 1 is characterized in that, wherein this pressure-sensing device is a Silicon pressure sensor, or is a piezoelectric crystal transducer, or is a capacitive pressure sensing/converter.
3, measuring cell as claimed in claim 2 is characterized in that, wherein this Silicon pressure sensor is one or a piezoresistance of connecting.
4, measuring cell as claimed in claim 2 is characterized in that, wherein this piezoelectric crystal transducer is the piezoelectric crystal of a soft soldering on a suitable oscillating plate.
5, measuring cell as claimed in claim 1 is characterized in that, wherein this signal is the variation of resistance, or is the variation of crystal oscillation frequency, or is the variation of capacitor's capacity.
6, measuring cell as claimed in claim 1 is characterized in that, wherein this oscillatory circuit is an oscillator or a waveform generator.
7, measuring cell as claimed in claim 6 is characterized in that, wherein this oscillator system is made up of pressure-sensing device and active/passive element.
8, measuring cell as claimed in claim 7 is characterized in that, wherein this active component system can be: transistor, field effect transistor, operational amplifier, comparer, logical integrated circuit phase inverter or Shi Mitemen, the timing IC " NE 555/556 " or the function generator of more vairable " ICL8038 " etc.
9, measuring cell as claimed in claim 1 is characterized in that, wherein this treating apparatus is a micro computer integrated circuit, and it converts the frequency output of oscillatory circuit to manifest on the display device numeral.
10, measuring cell as claimed in claim 1 is characterized in that, wherein this display device is a LCD or light emitting diode indicator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94101230 CN1106537A (en) | 1994-02-07 | 1994-02-07 | Pressure measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94101230 CN1106537A (en) | 1994-02-07 | 1994-02-07 | Pressure measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1106537A true CN1106537A (en) | 1995-08-09 |
Family
ID=5030059
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94101230 Pending CN1106537A (en) | 1994-02-07 | 1994-02-07 | Pressure measuring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1106537A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101688814B (en) * | 2007-07-10 | 2012-02-08 | 罗伯特.博世有限公司 | Connection unit for a pressure measuring cell |
| CN102384810A (en) * | 2011-09-19 | 2012-03-21 | 广东天富电气集团有限公司 | Pressure transmitter |
| CN103364130A (en) * | 2012-03-27 | 2013-10-23 | 罗伯特·博世有限公司 | Sensor unit |
| CN113261961A (en) * | 2021-03-23 | 2021-08-17 | 微传智能科技（上海）有限公司 | Female pelvic floor muscle pressure detection system |
| WO2022198728A1 (en) * | 2021-03-23 | 2022-09-29 | 微传智能科技（上海）有限公司 | Female pelvic floor muscle pressure measurement method and system |
-
1994
- 1994-02-07 CN CN 94101230 patent/CN1106537A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101688814B (en) * | 2007-07-10 | 2012-02-08 | 罗伯特.博世有限公司 | Connection unit for a pressure measuring cell |
| CN102384810A (en) * | 2011-09-19 | 2012-03-21 | 广东天富电气集团有限公司 | Pressure transmitter |
| CN103364130A (en) * | 2012-03-27 | 2013-10-23 | 罗伯特·博世有限公司 | Sensor unit |
| CN103364130B (en) * | 2012-03-27 | 2016-08-17 | 罗伯特·博世有限公司 | Sensor unit |
| CN113261961A (en) * | 2021-03-23 | 2021-08-17 | 微传智能科技（上海）有限公司 | Female pelvic floor muscle pressure detection system |
| WO2022198728A1 (en) * | 2021-03-23 | 2022-09-29 | 微传智能科技（上海）有限公司 | Female pelvic floor muscle pressure measurement method and system |
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |