EP3391001A1 - Drucksensor und verfahren zum bedienen eines drucksensors - Google Patents
Drucksensor und verfahren zum bedienen eines drucksensorsInfo
- Publication number
- EP3391001A1 EP3391001A1 EP16795097.1A EP16795097A EP3391001A1 EP 3391001 A1 EP3391001 A1 EP 3391001A1 EP 16795097 A EP16795097 A EP 16795097A EP 3391001 A1 EP3391001 A1 EP 3391001A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure
- pressure sensor
- electrical signal
- optical excitation
- measuring
- 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.)
- Ceased
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/0001—Transmitting or indicating the displacement of elastically deformable gauges by electric, electro-mechanical, magnetic or electro-magnetic means
- G01L9/0008—Transmitting or indicating the displacement of elastically deformable gauges by electric, electro-mechanical, magnetic or electro-magnetic means using vibrations
- G01L9/0019—Transmitting or indicating the displacement of elastically deformable gauges by electric, electro-mechanical, magnetic or electro-magnetic means using vibrations of a semiconductive element
- G01L9/002—Optical excitation or measuring
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/0041—Transmitting or indicating the displacement of flexible diaphragms
- G01L9/0051—Transmitting or indicating the displacement of flexible diaphragms using variations in ohmic resistance
- G01L9/0052—Transmitting or indicating the displacement of flexible diaphragms using variations in ohmic resistance of piezoresistive elements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/14—Housings
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/0041—Transmitting or indicating the displacement of flexible diaphragms
- G01L9/0042—Constructional details associated with semiconductive diaphragm sensors, e.g. etching, or constructional details of non-semiconductive diaphragms
Definitions
- the invention relates to a pressure sensor for determining a pressure measurement and a method for operating such a pressure sensor.
- Pressure sensors are used to detect pressures and are often used in industrial metrology, for example for level measurement or flow measurement. Depending on the application, different types of pressure sensors are used. Thus, a pressure sensor, for example, as an absolute pressure sensor, as
- Relative pressure sensor or be designed as a differential pressure sensor. In principle, however, all pressure sensors have the same structure and typically include a housing in which a pressure sensor element is arranged. In pressure measurement technology, semiconductor pressure sensor elements, for example silicon-based, are popular.
- the semiconductor pressure sensor elements in this case have a measuring diaphragm which typically has four in its edge region
- the measuring diaphragm is pressurized on its first side with a first pressure and on its second side with a second pressure, so that the two pressures cause a deflection of the measuring diaphragm.
- the pressure-dependent deflection of the measuring diaphragm is via the integrated
- Relative pressure sensor an absolute pressure sensor or a differential pressure sensor
- the measuring membrane is applied to the corresponding two pressures.
- the pressure sensor is designed as an absolute pressure sensor
- one of the two sides of the measuring diaphragm is exposed to a vacuum and the other side of the measuring diaphragm is supplied with a measured media pressure.
- the absolute pressure sensor thus measures the absolute pressure, ie the medium pressure to be measured in comparison to the vacuum as a reference pressure.
- the pressure sensor is designed as a relative pressure sensor
- one of the two sides of the measuring diaphragm is exposed to an atmospheric air pressure as the reference pressure and the other side of the measuring diaphragm becomes a measuring one
- the relative pressure sensor thus measures a relative pressure, ie the medium pressure to be measured in comparison to the atmospheric air pressure.
- the pressure sensor is designed as a differential pressure sensor
- one of the two sides of the measuring diaphragm is supplied with a first medium pressure to be measured and a second medium pressure to be measured is supplied to the other side of the measuring diaphragm.
- a differential pressure ie the difference between the two media pressures.
- the object is achieved by a pressure sensor and a method for operating such a pressure sensor.
- the object is achieved by a pressure sensor for
- Pressure sensor element comprises a semiconductor material and a measuring membrane, wherein on a first side of the measuring membrane, a first pressure and on a second side of the measuring membrane, a second pressure is applied, so that the measuring membrane a
- the measuring membrane has at least one integrated resistance element and the control / evaluation unit using the integrated resistive element determines an electrical signal for Druckmessdorfnbeées, wherein the illuminant is an optical excitation of the pressure sensor element and the control / evaluation unit based on a due optical excitation caused change in the electrical signal determines the first and / or second pressure inherent static pressure value and performs a correction or compensation of the pressure measured variable with the aid of the static pressure value.
- the effect called photoconductivity is exploited to obtain information about a static pressure.
- the static pressure is inherent in at least one of the two sides of the measuring membrane applied media pressure.
- photoconductive effect is an effect attributed to the internal photoelectric effect, in which the increase in the electrical conductivity of semiconductor materials occurs due to the formation of unbonded electron-hole pairs upon irradiation, Understood.
- the pressure sensor element which comprises at least one semiconductor material and a measuring diaphragm
- an electrical signal for example a bridge voltage signal
- the static pressure value can thus be determined.
- a pressure measured variable determined by the pressure sensor is corrected or compensated.
- An advantageous embodiment of the pressure sensor according to the invention provides that the optical excitation comprises a plurality of individual optical pulses.
- a further advantageous embodiment of the pressure sensor according to the invention provides that the measuring diaphragm has further integrated resistance elements and in each case one light-emitting means is provided for each further resistance element.
- a further advantageous embodiment of the pressure sensor according to the invention provides that the lighting means is a light emitting diode.
- a further advantageous embodiment of the pressure sensor according to the invention provides that the optical excitation occurs cyclically and wherein during two cycles, the control / evaluation unit the last determined static pressure value for correction or
- the object is achieved by a method for operating a pressure sensor, which is designed in particular according to one of the preceding embodiments, wherein the pressure sensor comprises a pressure sensor element, which comprises a semiconductor material and a measuring diaphragm to the first side on a first pressure and a second side is applied a second pressure, the method comprising the following steps:
- Detecting the change of the electrical signal several individual electrical signal values are detected.
- the embodiment provides that the change in the electrical signal is determined by averaging the detected individual electrical signal values.
- a further advantageous embodiment of the method according to the invention provides that the optical excitation is carried out cyclically during the measuring operation.
- a last advantageous embodiment of the method according to the invention provides that the correction or compensation is performed via a look-up table and / or a mathematical equation.
- FIG. 1 shows a schematic representation of the pressure sensor according to the invention
- FIG. 2 shows a schematic block diagram of the pressure sensor according to the invention
- FIG. 3 shows a test setup which was used to investigate the effect
- FIG. 4 shows an experimentally determined first measurement curve or measurement curves
- FIG. 5 shows a second measurement curve or measurement curves determined experimentally on the basis of the experimental setup
- FIG. 7 shows a third measuring curve or measuring curves experimentally determined on the basis of the experimental setup
- FIG. 8 shows an exemplary correction function which can be used for the correction or compensation of the pressure measurement variable of a pressure sensor
- FIG. 9 shows a schematic representation of the method steps of the method according to the invention.
- FIG. 1 shows a schematic representation of the pressure sensor 1 according to the invention.
- This comprises a housing 2, a pressure sensor element 3 arranged in the housing 2 and a lighting means 4 likewise arranged in the housing.
- the introduced into the housing 2 pressure sensor element 3 comprises a semiconductor material, preferably silicon on.
- a measuring diaphragm 5 for example.
- the measuring diaphragm 5 at a first side pi, eg. An atmospheric pressure, and at a second side a second pressure p 2 , for example.
- a to be measured Media pressure which is a static pressure inherent fed.
- the measuring membrane again comprises four resistance elements 6, which are generated, for example, by doping the semiconductor material.
- the resistance elements 6 integrated in the measuring diaphragm 5 in this manner are typically arranged in the edge region of the measuring diaphragm 5 in order to detect the pressure-dependent deflection of the measuring diaphragm 5 in the form of a resistance change.
- the pressure sensor 1 can determine or output a pressure measured variable.
- Fig. 1 thus shows a relative pressure sensor.
- the invention is equally applicable to an absolute pressure or differential pressure sensor.
- FIG. 2 shows a schematic block diagram of the pressure sensor 1 according to the invention, which additionally comprises a control / evaluation unit 8 in addition to the light source 4 with a corresponding light source drive unit 7, the resistance elements 6.
- Resistance elements 6 are connected to a Wheatstone bridge 9 and the control / evaluation unit 8 is typically used to detect an electrical signal 10 representing the resistance values, for example the bridge voltage signal U B. On the basis of the detected electrical signal 10, in the case shown the
- Fig. 3 shows a test setup which was used to study the effect.
- Experimental set-up comprises a first assembly 1 1 and a second assembly 12, which are connected to each other via a hydraulic chamber assembly 13.
- the first module 1 1 has a light emitting diode 4 (short: LED) on a transistor Outline carrier type 8 (short: TO-8) and the second module a pressure sensor element, which is also located on a TO-8 carrier.
- the hydraulic chamber assembly 13 has a filler neck 14 for filling the hydraulic chamber assembly 13 with a diaphragm seal fluid or a silicone oil.
- the pressure sensor element is electrically connected to a sensor electronics, which in particular comprises a control / evaluation unit. About the sensor electronics, the electrical signal, which due to the change in resistance of the
- Resistance elements 6 of the Wheatstone bridge 9 results, converted into a pressure measurement.
- FIG. 4 shows a multiplicity of first measurement curves determined experimentally on the basis of the experimental setup described above.
- both the LED and the pressure sensor element via the hydraulic chamber composite was simultaneously subjected to the static pressure.
- the pressure sensor element was optically excited by the LED.
- the optical excitation was carried out by a variety of optical
- the change or deviation of the electrical signal was detected by averaging the detected multiple individual signal values, wherein the variation or deviation represents the difference of the optical signal with optical excitation and the electrical signal without optical excitation.
- the pressure sensor element showed both a
- FIG. 5 shows a multiplicity of second measurement curves determined experimentally on the basis of the experimental setup described above.
- the pressure sensor element was replaced by a photodiode as a receiver in the experimental setup described and both the LED and the photodiode were exposed to the static pressure, wherein the hydraulic chamber assembly was not filled with the diaphragm seal fluid.
- the linearity deviations are due to the fact that the effect is superimposed on both the photodiode and the LED.
- the amplifier circuit shown in Fig. 6 (a) was used, which images a photon current of 0 to 15 ⁇ to an output of 0 to 15V.
- FIG. 6 (b) shows a photon current of 0 to 15 ⁇ to an output of 0 to 15V.
- FIG. 7 shows a multiplicity of third measurement curves determined experimentally on the basis of the experimental setup.
- the pressure sensor element was again replaced by a photodiode as a receiver in the experimental setup described and both the LED as well as the photodiode were exposed to the static pressure, the hydraulic chamber assembly once filled with the diaphragm seal fluid and once was unfilled. From Fig. 7 it can be seen that a temperature-dependent
- the photoelectric effect can also be used to estimate the static pressure in a pressure sensor, so that the measurement error of a pressure sensor can be reduced with the aid of a mathematical model.
- a correction function as shown by way of example in FIG. 8, can be used.
- control / evaluation unit 8 is designed to carry out the method according to the invention shown schematically in FIG. 9 and described below according to the following method steps:
- Light source for example.
- the optical excitation can be effected by a single or selectively via a plurality of light sources, preferably in each case a light source for a resistance element. It has proved to be advantageous if the lighting means is pulsed, i. the respective optical excitation is carried out by a plurality of individual optical pulses, which follow one another directly. Furthermore, it has proven to be advantageous if the optical excitation is performed cyclically during the measuring operation.
- Resistive elements 6 is carried out, an electrical signal 10 is preferably detected by each of the resistive elements 6.
- the optical excitation is generated by a plurality of individual pulses, it is advantageous to change the electrical signal by a
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102015121859.3A DE102015121859A1 (de) | 2015-12-15 | 2015-12-15 | Drucksensor und Verfahren zum Bedienen eines Drucksensors |
PCT/EP2016/077716 WO2017102210A1 (de) | 2015-12-15 | 2016-11-15 | Drucksensor und verfahren zum bedienen eines drucksensors |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3391001A1 true EP3391001A1 (de) | 2018-10-24 |
Family
ID=57288456
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16795097.1A Ceased EP3391001A1 (de) | 2015-12-15 | 2016-11-15 | Drucksensor und verfahren zum bedienen eines drucksensors |
Country Status (5)
Country | Link |
---|---|
US (1) | US20180372571A1 (de) |
EP (1) | EP3391001A1 (de) |
CN (1) | CN108474703B (de) |
DE (1) | DE102015121859A1 (de) |
WO (1) | WO2017102210A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102015112408A1 (de) * | 2015-07-29 | 2017-02-02 | Endress + Hauser Gmbh + Co. Kg | Drucksensor und Verfahren zum Überwachen eines Drucksensors |
RU2730890C1 (ru) * | 2019-06-13 | 2020-08-26 | Федеральное Государственное Унитарное Предприятие "Всероссийский Научно-Исследовательский Институт Автоматики Им.Н.Л.Духова" (Фгуп "Внииа") | Датчик давления с интегральным преобразователем температуры пониженного энергопотребления |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3714829A (en) * | 1970-06-29 | 1973-02-06 | Beckman Instruments Inc | Pressure measuring system |
JPS5595373A (en) * | 1979-01-11 | 1980-07-19 | Nissan Motor Co Ltd | Semiconductor pressure sensor |
CH667736A5 (de) * | 1984-10-15 | 1988-10-31 | Huba Control Ag | Auf druck ansprechender geber. |
EP0419021A3 (en) * | 1989-08-30 | 1991-10-09 | Schlumberger Industries Limited | Sensors with vibrating elements |
US5559358A (en) * | 1993-05-25 | 1996-09-24 | Honeywell Inc. | Opto-electro-mechanical device or filter, process for making, and sensors made therefrom |
GB2427910B (en) * | 2005-07-02 | 2008-03-12 | Sensor Highway Ltd | Fiber optic temperature and pressure sensor and system incorporating same |
DE102006062552B4 (de) * | 2006-12-29 | 2009-12-24 | Bartels Mikrotechnik Gmbh | Verfahren und Vorrichtung zur Durchflussmessung |
CN201210101Y (zh) * | 2007-12-25 | 2009-03-18 | 上海自动化仪表股份有限公司 | 带oled显示的压力变送器 |
JP5400708B2 (ja) * | 2010-05-27 | 2014-01-29 | オムロン株式会社 | 音響センサ、音響トランスデューサ、該音響トランスデューサを利用したマイクロフォン、および音響トランスデューサの製造方法 |
FR2977319B1 (fr) * | 2011-07-01 | 2014-03-14 | Commissariat Energie Atomique | Dispositif de mesure de pression a sensiblite optimisee |
WO2013129444A1 (ja) * | 2012-02-27 | 2013-09-06 | 株式会社フジクラ | 圧力センサモジュール及び蓋体 |
-
2015
- 2015-12-15 DE DE102015121859.3A patent/DE102015121859A1/de not_active Withdrawn
-
2016
- 2016-11-15 EP EP16795097.1A patent/EP3391001A1/de not_active Ceased
- 2016-11-15 CN CN201680073747.7A patent/CN108474703B/zh active Active
- 2016-11-15 WO PCT/EP2016/077716 patent/WO2017102210A1/de unknown
- 2016-11-15 US US16/061,598 patent/US20180372571A1/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
WO2017102210A1 (de) | 2017-06-22 |
CN108474703A (zh) | 2018-08-31 |
US20180372571A1 (en) | 2018-12-27 |
DE102015121859A1 (de) | 2017-06-22 |
CN108474703B (zh) | 2021-03-09 |
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