CN109259744A - Internal pressure monitor in high precision - Google Patents
Internal pressure monitor in high precision Download PDFInfo
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- CN109259744A CN109259744A CN201811163291.0A CN201811163291A CN109259744A CN 109259744 A CN109259744 A CN 109259744A CN 201811163291 A CN201811163291 A CN 201811163291A CN 109259744 A CN109259744 A CN 109259744A
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- 238000012545 processing Methods 0.000 claims abstract description 26
- 230000003321 amplification Effects 0.000 claims abstract description 12
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 12
- 230000005611 electricity Effects 0.000 claims description 5
- 230000009466 transformation Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 6
- 239000004065 semiconductor Substances 0.000 abstract description 5
- 230000005284 excitation Effects 0.000 abstract description 3
- 239000003814 drug Substances 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 5
- 230000035945 sensitivity Effects 0.000 description 5
- 230000001105 regulatory effect Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000835 fiber Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 230000036772 blood pressure Effects 0.000 description 1
- 210000001124 body fluid Anatomy 0.000 description 1
- 239000010839 body fluid Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000007917 intracranial administration Methods 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/021—Measuring pressure in heart or blood vessels
- A61B5/02141—Details of apparatus construction, e.g. pump units or housings therefor, cuff pressurising systems, arrangements of fluid conduits or circuits
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/03—Detecting, measuring or recording fluid pressure within the body other than blood pressure, e.g. cerebral pressure; Measuring pressure in body tissues or organs
- A61B5/031—Intracranial pressure
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/03—Detecting, measuring or recording fluid pressure within the body other than blood pressure, e.g. cerebral pressure; Measuring pressure in body tissues or organs
- A61B5/033—Uterine pressure
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/20—Measuring for diagnostic purposes; Identification of persons for measuring urological functions restricted to the evaluation of the urinary system
- A61B5/202—Assessing bladder functions, e.g. incontinence assessment
- A61B5/205—Determining bladder or urethral pressure
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
- A61B5/7203—Signal processing specially adapted for physiological signals or for diagnostic purposes for noise prevention, reduction or removal
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
- A61B5/7225—Details of analog processing, e.g. isolation amplifier, gain or sensitivity adjustment, filtering, baseline or drift compensation
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2562/00—Details of sensors; Constructional details of sensor housings or probes; Accessories for sensors
- A61B2562/02—Details of sensors specially adapted for in-vivo measurements
- A61B2562/0247—Pressure sensors
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Molecular Biology (AREA)
- Animal Behavior & Ethology (AREA)
- Veterinary Medicine (AREA)
- Biophysics (AREA)
- Pathology (AREA)
- Public Health (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Medical Informatics (AREA)
- General Health & Medical Sciences (AREA)
- Surgery (AREA)
- Physics & Mathematics (AREA)
- Physiology (AREA)
- Signal Processing (AREA)
- Cardiology (AREA)
- Hematology (AREA)
- Artificial Intelligence (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Psychiatry (AREA)
- Vascular Medicine (AREA)
- Neurosurgery (AREA)
- Urology & Nephrology (AREA)
- Power Engineering (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention discloses the internal pressure monitors of high-precision, are related to medicine and hygiene fields；Including preposition amplification and processing unit, the preposition amplification and processing unit include pressure sensor, preamplifier, analog-digital converter, DC voltage power supply and reference resistance Rf；The pressure sensor is piezoresistive bridge sensor, and the signal output end of pressure sensor is connected to the signal input part of the preamplifier；The signal output end of the preamplifier is connected to the signal input part of the analog-digital converter；The reference resistance RfIt connects with the pressure sensor, reference resistance RfPartial pressure for reference voltage as analog-digital converter；The direct current power source voltage gives pressure sensor and the reference resistance R simultaneouslyfSeries circuit and preamplifier power supply；Various errors and temperature drift can be eliminated under conditions of using conventional excitation power supply and semiconductor material pressure sensor using technical solution of the present invention, realize high-acruracy survey.
Description
" technical field "
The present invention relates to medicine and hygiene fields, more particularly to a kind of internal pressure monitor of high-precision.
" background technique "
The intracorporal blood of life, tissue and body fluid etc. have certain pressure, such as blood pressure, intracranial pressure, intraspinal tube pressure, wing
Guang pressure, uterine pressure etc..Internal pressure monitoring is divided into noninvasive and invasive two ways.Invasive mode also known as directly measures
Method is to obtain pressure signal using pressure sensor by establishing direct channel with measuring point.Invasive mode is more quasi- because of it
Really reliably clinically generally regarded as being goldstandard.
Sensor used in the direct method of measurement can be divided into fibre optical sensor and piezoresistive bridge sensor.Fibre optical sensor,
Although measurement is accurate, it manufactures complexity, expensive, inconvenient for use, and drainage cannot be taken into account while monitoring pressure, is filled
The treatment function such as note.Piezoresistive bridge sensor is clinically mainly used at present, and because spatial volume and cost are limited, pressure drag bridge
The material of formula sensor is nearly all semiconductor material.
The piezoresistive bridge sensor of semiconductor material have maximum a problem be exactly have because of variation of ambient temperature it is very bright
Aobvious temperature drift.In addition, constituting other electronic components of entire circuit, there is also have temperature drift because of variation of ambient temperature.
It is explained as follows.
It is U in driving voltage, resistance-strain amount caused by pressure is Δ R, and arm resistance is for piezoresistive bridge sensor
Under conditions of R, according to pressure drag electric bridge formula, output signal voltage VoutFor
As it can be seen that make output signal voltage VoutIt is linearly proportional with resistance-strain amount Δ R, then require excitation electricity
It presses U and arm resistance R all invariable or both of which ratios constant is constant.
It, the regulated power supply configured with high-precision and low excursion with temperature if wanting driving voltage invariable.It is such
Regulated power supply design is more complex, and cost is not also low, and precision is also not easy to be made too high.
If wanting arm resistance invariable, it is required that the arm resistance of pressure sensor is high-precision and high stability
, this is just more difficult.Changes will occur for each arm resistance of the piezoresistive bridge sensor of semiconductor material, each bridge arm electricity
Resistance with variation degree it is all inconsistent, eventually led to obviously temperature drift.
If wanting the ratios constant of driving voltage and arm resistance constant, constant-current source circuit can be used.But constant-current source is electric
Road must also have regulated power supply as benchmark.The design of the regulated power supply of high-precision and low excursion with temperature is more complex, and cost is not also low,
And precision is also not easy to be made too high.
" summary of the invention "
Based on the shortcomings of the prior art, the purpose of the present invention is to provide a kind of internal pressure monitor of high-precision,
The monitor is under conditions of using conventional excitation power supply and conventional semiconductor material pressure sensor, it will be able to realize high
Precision measure.
To achieve the above object, the present invention adopts the following technical scheme that:
Internal pressure monitor in high precision, it is characterised in that including preposition amplification and processing unit, it is described it is preposition amplification and
Processing unit includes pressure sensor, preamplifier, analog-digital converter, DC voltage power supply and reference resistance Rf；
The pressure sensor is piezoresistive bridge sensor, and the signal output end of the piezoresistive bridge sensor is connected to institute
The signal input part of preamplifier is stated, the pressure sensor is used to the pressure signal monitored being converted to electric signal, institute
The signal output end for stating preamplifier is connected to the signal input part of the analog-digital converter, and the preamplifier is used for will
The electric signal amplification of pressure sensor output；
The reference resistance RfIt connects with the pressure sensor, the reference resistance RfPartial pressure be used for as modulus turn
The reference voltage of parallel operation is connected with two reference voltage input terminals of the analog-digital converter；
The direct current power source voltage connects the pressure sensor and the reference resistance RfSeries loop both ends and
The power input of preamplifier, the direct current power source voltage give the pressure sensor and the reference resistance R simultaneouslyf's
Series circuit and preamplifier power supply.
Further, the reference resistance RfThe voltage at both ends is connected to the modulus after zooming in or out and turns
Two reference voltage input terminals of parallel operation.
Further, the reference resistance RfIt is connected on the negative incentive end of the pressure sensor, the reference resistance Rf
One end ground connection, other end connect the negative incentive end of pressure sensor.
Further, the preamplifier further includes a proportion divider circuit, and the proportion divider circuit is through impedance
The common-mode voltage of common-mode voltage after transformation driving as the preamplifier, preamplifier is equal or close to the pressure
The common-mode voltage of force snesor.
Further, the reference resistance RfImpedance value be less than or equal to the pressure sensor equivalent impedance 5%.
Further, the pressure sensor is piezoresistive bridge sensor one build-out resistor of series connection.
It further, further include central processing unit, key operation unit, input/output interface and display unit；It is described
Central processing unit has multiple output ends, input terminal and output input；The output end and key of the analog-digital converter
Operating unit connects an input terminal for being connected respectively to the central processing unit, and the display unit is connected to the centre
Manage an output end of device；The input and output interfaces are connected to an output input of the central processing unit.
Further, the preamplifier and analog-digital converter are integrated chip.
Further, the central processing unit be one be integrated with the preamplifier, the analog-digital converter and
The special chip of the DC voltage power supply.
Further, the special chip is mixed-signal processor.
Further, the DC voltage power supply is integrated into the central processing unit or the preamplifier or institute
It states in analog-digital converter.
The invention has the advantages that giving pressure sensor and preamplifier to supply simultaneously using the same voltage source
Electricity can eliminate deviation caused by mains fluctuations；Avoid voltage regulation factor bring large error.By in preceding storing
Set scale bleeder circuit eliminates the common-mode voltage of preamplifier close to the common-mode voltage of pressure sensor inside big device
Offset errors caused by sensor common-mode voltage；By by reference resistance RfPartial pressure as analog-digital converter reference voltage,
Avoid arm resistance variation and caused by sensitivity variations and mains voltage variations and caused by sensitivity variations.With reference to electricity
Hinder RfLesser value is taken, ensures that the interchangeability for pressure sensor in this way.Body pressure monitor provided by the present invention makes
It can be realized as high-acruracy survey with conventional electronic component.
" Detailed description of the invention "
Fig. 1 is the overall structure block diagram of high-precision pressure monitor provided in an embodiment of the present invention.
Fig. 2 is the structural block diagram of preposition amplification and processing unit provided in an embodiment of the present invention.
Fig. 3 is the circuit diagram of preposition amplification and processing unit provided in an embodiment of the present invention.
" specific embodiment "
In order to which technical solution of the present invention is more clearly understood, the present invention is made below in conjunction with attached drawing and specific embodiment
It further illustrates:
As shown in Fig. 1~2, a kind of internal pressure monitor of high-precision, including preposition amplification and processing unit, central processing
Device, key operation unit, input/output interface and display unit；The preposition amplification and processing unit include pressure sensing
Device, preamplifier, analog-digital converter, DC voltage power supply and reference resistance Rf；
The central processing unit has multiple output ends, input terminal and output input；The analog-digital converter it is defeated
Outlet and key operation unit connection are connected respectively to an input terminal of the central processing unit, the display unit connection
To an output end of the central processing unit；The output that the input and output interfaces are connected to the central processing unit is defeated
Enter end.
The pressure sensor is piezoresistive bridge sensor one build-out resistor of series connection；The piezoresistive bridge sensor it is defeated
Outlet is connected to the signal input part of the preamplifier, and the pressure sensor is used to convert the pressure signal monitored
For electric signal；The signal output end of the preamplifier is connected to the signal input part of the analog-digital converter, described preposition
The electric signal that amplifier is used to export pressure sensor amplifies；
The reference resistance RfIt is connected on the negative incentive end of the pressure sensor, reference resistance RfOne end ground connection, in addition
The negative incentive end of one end connection pressure sensor；The reference resistance RfPartial pressure can through zooming in or out or directly
For the reference voltage as analog-digital converter, it is connected with two input terminals of the reference voltage of the analog-digital converter；With reference to
Resistance RfValue will be much smaller than pressure sensor equivalent input impedance, generally preferably below 5%.Under these conditions, when
When replacement uses the pressure sensor of another input impedance, overall sensitivity is considered as remaining unchanged.It ensures that in this way
For the interchangeability of pressure sensor.
The direct current power source voltage connects the pressure sensor and the reference resistance RfSeries loop both ends and
The power input of preamplifier, the direct current power source voltage give the pressure sensor and the reference resistance R simultaneouslyf's
Series circuit and preamplifier power supply.
Because being powered using the same voltage source while to pressure sensor and preamplifier, power supply can be eliminated
Deviation caused by voltage fluctuation.There is no voltage regulation factor bring large errors.
As shown in figure 3, the central processing unit used in the present embodiment is actually to be integrated with preamplifier, analog-to-digital conversion
The special chip ASIC of device and DC voltage power supply etc..Pressure sensor is piezoresistive bridge sensor one build-out resistor of series connection.
The positive analog input pin AINP of the positive output end connection ASIC of piezoresistive bridge sensor, negative output terminal connect ASIC
Negative sense analog input pin AINN.Reference resistance RfIt is connected on the negative incentive end of piezoresistive bridge sensor, reference resistance RfOne end
Ground connection, other end connect the negative incentive end of piezoresistive bridge sensor.
It is in the same direction to input with operational amplifier A1 after positive one electromagnetic interface filter of analog input pin AINP connection of ASIC
End connection, A1 are used to amplify the positive output end of piezoresistive bridge sensor；One EMI of negative sense analog input pin AINN connection of ASIC
It is connect after filter with the noninverting input of operational amplifier A2, A2 is used to amplify the negative output terminal of piezoresistive bridge sensor；Through
The positive output signal and negative output signal of the piezoresistive bridge sensor of amplification are connected respectively to the input in the same direction of operational amplifier A3
End carries out second with negative input and amplifies, and second of amplified signal is output to the signal input part of analog-digital converter,
Signal and reference resistance R in analog-digital converter by amplifying secondfVoltage-contrast after output digit signals.
When supply voltage becomes smaller, the output signal of piezoresistive bridge sensor just becomes smaller；And simultaneously, because supply voltage becomes
It is small to cause to flow through reference resistance RfElectric current can become smaller, so reference resistance RfOn voltage also become smaller.Final ADC exports knot
Fruit is constant.Vice versa.In this way eliminate mains voltage variations and caused by sensitivity variations.
When temperature change makes the arm resistance of electric bridge become larger, according to pressure drag electric bridge formula, output signal just becomes smaller；And
Meanwhile because arm resistance, which becomes larger, leads to flow through reference resistance RfElectric current can become smaller, so reference resistance RfOn voltage also become
It is small.Final ADC output result is constant.Vice versa.In this way eliminate arm resistance variation and caused by sensitivity variations.
Other parts in ASIC are unrelated with this patent, are not described.It can be realized by routine techniques.
The embedded software for needing to run in ASIC is unrelated with this patent, is not described.It can be realized by routine techniques.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Those of ordinary skill in the art in the technical scope disclosed by the present invention, are equal according to the technical solution of invention and design
Replacement changes, and should be covered by the scope of protection of the present invention.
Claims (11)
1. the internal pressure monitor of high-precision, which is characterized in that including preposition amplification and processing unit, the preposition amplification and place
Managing unit includes pressure sensor, preamplifier, analog-digital converter, DC voltage power supply and reference resistance Rf；
The pressure sensor is piezoresistive bridge sensor；The signal output end of the piezoresistive bridge sensor be connected to it is described before
Set the signal input part of amplifier；
The signal output end of the preamplifier is connected to the signal input part of the analog-digital converter；
The reference resistance RfIt connects with the pressure sensor, the reference resistance RfPartial pressure be used for be used as analog-digital converter
Reference voltage, be connected with the reference voltage input terminal of the analog-digital converter；
The direct current power source voltage connects the pressure sensor and the reference resistance RfSeries loop both ends and preceding storing
The power input of big device, the direct current power source voltage give the pressure sensor and the reference resistance R simultaneouslyfSeries electrical
Road and preamplifier power supply.
2. the internal pressure monitor of high-precision as described in claim 1, it is characterised in that: the reference resistance RfThe electricity at both ends
Pressure, is connected to two reference voltage input terminals of the analog-digital converter after zooming in or out.
3. the internal pressure monitor of high-precision as described in claim 1, it is characterised in that: the reference resistance RfIt is connected on institute
State the negative incentive end of pressure sensor, the reference resistance RfOne end ground connection, other end connect the negative sense of pressure sensor
Motivate end.
4. the internal pressure monitor of high-precision as described in claim 1, it is characterised in that: the preamplifier further includes one
A proportion divider circuit, common-mode voltage of the proportion divider circuit after impedance transformation driving as the preamplifier,
The common-mode voltage of preamplifier is equal or close to the common-mode voltage of the pressure sensor.
5. the internal pressure monitor of high-precision as described in claim 1, it is characterised in that: the reference resistance RfImpedance value
Less than or equal to the 1% of the equivalent impedance of the pressure sensor.
6. the internal pressure monitor of high-precision as described in claim 1, it is characterised in that: the pressure sensor is pressure drag bridge
One build-out resistor of formula sensor series.
7. the internal pressure monitor of high-precision as described in claim 1~6 any one, it is characterised in that: further include center
Processor, key operation unit, input/output interface and display unit；The central processing unit has multiple output ends, defeated
Enter end and output input；Output end and the key operation unit connection of the analog-digital converter are connected respectively in described
One input terminal of central processor, the display unit are connected to an output end of the central processing unit；The output is defeated
Incoming interface is connected to an output input of the central processing unit.
8. the internal pressure monitor of high-precision as described in claim 1~6, it is characterised in that: the preamplifier and mould
Number converter is integrated chip.
9. the internal pressure monitor of high-precision as claimed in claim 7, it is characterised in that: the central processing unit is a collection
At the special chip of the preamplifier, the analog-digital converter and the DC voltage power supply.
10. the internal pressure monitor of high-precision as claimed in claim 9, it is characterised in that: the special chip is mixing letter
Number processor.
11. the internal pressure monitor of high-precision as claimed in claim 7, it is characterised in that: the DC voltage power supply is integrated
Into the central processing unit or the preamplifier or the analog-digital converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811163291.0A CN109259744B (en) | 2018-09-30 | 2018-09-30 | High-precision in-vivo pressure monitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811163291.0A CN109259744B (en) | 2018-09-30 | 2018-09-30 | High-precision in-vivo pressure monitor |
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| Publication Number | Publication Date |
|---|---|
| CN109259744A true CN109259744A (en) | 2019-01-25 |
| CN109259744B CN109259744B (en) | 2023-09-19 |
Family
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811163291.0A Active CN109259744B (en) | 2018-09-30 | 2018-09-30 | High-precision in-vivo pressure monitor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112014004A (en) * | 2019-05-29 | 2020-12-01 | 硅微结构股份有限公司 | Voltage zero setting pressure sensor preamplifier |
| CN113624397A (en) * | 2021-08-16 | 2021-11-09 | 苏州司南传感科技有限公司 | Silicon piezoresistive pressure sensor calibration compensation method |
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| US4085620A (en) * | 1975-09-30 | 1978-04-25 | Tokyo Shibaura Electric Co., Ltd. | Pressure-electric transducers |
| US5668320A (en) * | 1995-06-19 | 1997-09-16 | Cardiometrics, Inc. | Piezoresistive pressure transducer circuitry accommodating transducer variability |
| EP1457767A1 (en) * | 2003-02-21 | 2004-09-15 | Haldex Brake Products GmbH | Measuring a pressure with a bridge and a reduced voltage for the A/D-converter |
| JP2010085190A (en) * | 2008-09-30 | 2010-04-15 | Denso Corp | Sensor apparatus and self-diagnosis method of sensor apparatus |
| US7747415B1 (en) * | 2005-12-22 | 2010-06-29 | Microstrain, Inc. | Sensor powered event logger |
| CN103323153A (en) * | 2013-06-27 | 2013-09-25 | 无锡信大气象传感网科技有限公司 | Piezoresistive pressure transmitter |
| US20150313478A1 (en) * | 2014-04-04 | 2015-11-05 | St. Jude Medical Systems Ab | Intravascular Pressure and Flow Data Diagnostic Systems, Devices, and Methods |
| CN204964077U (en) * | 2015-08-17 | 2016-01-13 | 宁波东海仪表水道有限公司 | Pressure drag formula pressure sensor pressure detection circuit |
| CN106322679A (en) * | 2016-08-31 | 2017-01-11 | 广东美的制冷设备有限公司 | Control method for outdoor fan of air conditioner |
| CN206504809U (en) * | 2017-02-20 | 2017-09-19 | 淄博飞雁先行测控技术有限公司 | Two-wire system pick-up output circuit based on power voltage supply type pressure sensor |
| CN108604149A (en) * | 2016-02-06 | 2018-09-28 | 深圳纽迪瑞科技开发有限公司 | The production method of pressure sensor, electronic equipment and the pressure sensor |
-
2018
- 2018-09-30 CN CN201811163291.0A patent/CN109259744B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4085620A (en) * | 1975-09-30 | 1978-04-25 | Tokyo Shibaura Electric Co., Ltd. | Pressure-electric transducers |
| US5668320A (en) * | 1995-06-19 | 1997-09-16 | Cardiometrics, Inc. | Piezoresistive pressure transducer circuitry accommodating transducer variability |
| EP1457767A1 (en) * | 2003-02-21 | 2004-09-15 | Haldex Brake Products GmbH | Measuring a pressure with a bridge and a reduced voltage for the A/D-converter |
| US7747415B1 (en) * | 2005-12-22 | 2010-06-29 | Microstrain, Inc. | Sensor powered event logger |
| JP2010085190A (en) * | 2008-09-30 | 2010-04-15 | Denso Corp | Sensor apparatus and self-diagnosis method of sensor apparatus |
| CN103323153A (en) * | 2013-06-27 | 2013-09-25 | 无锡信大气象传感网科技有限公司 | Piezoresistive pressure transmitter |
| US20150313478A1 (en) * | 2014-04-04 | 2015-11-05 | St. Jude Medical Systems Ab | Intravascular Pressure and Flow Data Diagnostic Systems, Devices, and Methods |
| CN204964077U (en) * | 2015-08-17 | 2016-01-13 | 宁波东海仪表水道有限公司 | Pressure drag formula pressure sensor pressure detection circuit |
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| CN106322679A (en) * | 2016-08-31 | 2017-01-11 | 广东美的制冷设备有限公司 | Control method for outdoor fan of air conditioner |
| CN206504809U (en) * | 2017-02-20 | 2017-09-19 | 淄博飞雁先行测控技术有限公司 | Two-wire system pick-up output circuit based on power voltage supply type pressure sensor |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112014004A (en) * | 2019-05-29 | 2020-12-01 | 硅微结构股份有限公司 | Voltage zero setting pressure sensor preamplifier |
| CN112014004B (en) * | 2019-05-29 | 2024-05-14 | 测量专业股份有限公司 | Preamplifier of voltage zero-setting pressure sensor |
| CN113624397A (en) * | 2021-08-16 | 2021-11-09 | 苏州司南传感科技有限公司 | Silicon piezoresistive pressure sensor calibration compensation method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109259744B (en) | 2023-09-19 |
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Application publication date: 20190125 Assignee: ROYAL FORNIA MEDICAL EQUIPMENT Co.,Ltd. Assignor: ZHUHAI YATELAN LIFE ENGINEERING TECHNOLOGY Co.,Ltd. Contract record no.: X2024980003289 Denomination of invention: High precision internal pressure monitoring instrument Granted publication date: 20230919 License type: Common License Record date: 20240322 |