WO2014068693A1 - Dispositif de mesure de vitesse de vent - Google Patents

Dispositif de mesure de vitesse de vent Download PDF

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Publication number
WO2014068693A1
WO2014068693A1 PCT/JP2012/078132 JP2012078132W WO2014068693A1 WO 2014068693 A1 WO2014068693 A1 WO 2014068693A1 JP 2012078132 W JP2012078132 W JP 2012078132W WO 2014068693 A1 WO2014068693 A1 WO 2014068693A1
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WO
WIPO (PCT)
Prior art keywords
wind speed
atmospheric pressure
anemometer
sensor
calculation unit
Prior art date
Application number
PCT/JP2012/078132
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English (en)
Japanese (ja)
Inventor
茂 出茂
Original Assignee
日本カノマックス株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 日本カノマックス株式会社 filed Critical 日本カノマックス株式会社
Priority to JP2014544113A priority Critical patent/JP6200896B2/ja
Priority to PCT/JP2012/078132 priority patent/WO2014068693A1/fr
Publication of WO2014068693A1 publication Critical patent/WO2014068693A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
    • G01P5/10—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring thermal variables
    • G01P5/12—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring thermal variables using variation of resistance of a heated conductor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P21/00—Testing or calibrating of apparatus or devices covered by the preceding groups
    • G01P21/02—Testing or calibrating of apparatus or devices covered by the preceding groups of speedometers
    • G01P21/025—Testing or calibrating of apparatus or devices covered by the preceding groups of speedometers for measuring speed of fluids; for measuring speed of bodies relative to fluids

Definitions

  • the present invention relates to an anemometer that measures a wind speed by heating a thermal wind speed sensor.
  • Patent Document 1 discloses an anemometer using a platinum wire as a thermal wind speed sensor.
  • This anemometer connects a platinum wire to one end of a Wheatstone bridge, energizes the platinum wire, heats it to a predetermined temperature, and supplies a constant current to the bridge circuit to keep the platinum wire at a constant high temperature, or current feedback. Control is performed so that the difference between the platinum wire and the ambient temperature is constant. And when changing from a steady state according to the wind speed of the wind which passes a platinum wire, the electric current etc. which flow through a bridge circuit are measured, and a wind speed is measured.
  • Such an anemometer is normally calibrated in advance so that an accurate wind speed value is obtained under the condition that the atmospheric pressure is 1 atm.
  • the atmospheric pressure affects the measured value of the wind speed, and if the atmospheric pressure is higher than 1 atm, the measured value is larger than the actual value, and if it is lower than 1 atm, the measured value is actual. Will be displayed smaller. Therefore, when it is necessary to accurately measure the wind speed, it is necessary to measure and correct the atmospheric pressure at that location.
  • the user checks the atmospheric pressure at the time of measurement, and after the wind speed measurement, the user performs a correction calculation based on the atmospheric pressure to obtain the wind speed value.
  • An anemometer is also used in which the wind speed value is automatically corrected by inputting the atmospheric pressure value separately measured by the user when the power is turned on.
  • the wind speed value is automatically corrected by inputting the atmospheric pressure value separately measured by the user when the power is turned on.
  • the user needs to measure and input the atmospheric pressure separately, which takes time and effort.
  • the present invention has been made in view of the problems of the conventional anemometer that measures the wind speed because the amount of heat dissipation varies depending on the wind speed, and it is necessary for the user to measure or input the atmospheric pressure.
  • the technical problem is to provide an anemometer that can automatically correct the wind speed value.
  • a current is applied to generate heat, a thermal wind speed sensor in which the amount of heat dissipation changes depending on the wind speed, an atmospheric pressure sensor that measures atmospheric pressure, A wind speed calculation unit that calculates a wind speed around the thermal wind speed sensor based on a heat dissipation amount from the thermal wind speed sensor, and a wind speed value measured by the wind speed calculation unit is measured by the atmospheric pressure sensor. And a wind speed correction calculation unit that corrects based on the atmospheric pressure.
  • the wind speed calculation unit outputs a wind speed value U calibrated with the wind speed as a standard pressure P 0
  • the wind speed correction calculation unit uses the wind speed value measured by the wind speed calculation unit as U and the atmospheric pressure as the wind speed value.
  • U m U ⁇ P 0 / P m
  • the corrected wind speed value U m may be output.
  • the thermal wind speed sensor is inserted at one end of a bridge circuit, and the wind speed calculation unit inputs a voltage difference between two midpoints of the bridge circuit and feeds back so that the temperature difference is constant. It is also possible to measure the wind speed based on the feedback amount of the feedback amplifier.
  • the thermal anemometer may be held in a measurement unit, and a main body including the atmospheric pressure sensor, the wind speed calculation unit, and a wind speed correction calculation unit may be separated from the measurement unit.
  • the anemometer has a cross-sectional area value in a region where the anemometer's thermal anemometer is disposed, assuming that the anemometer is at a temperature of 273 ° K and the atmospheric pressure is 1 atm.
  • Input the air velocity value by multiplying the cross-sectional area to obtain the air flow value, and convert it to the air flow value in the standard state using the atmospheric pressure measured by the atmospheric pressure sensor and the temperature measured by the air temperature sensor.
  • an air volume calculation unit is a cross-sectional area value in a region where the anemometer's thermal anemometer is disposed, assuming that the anemometer is at a temperature of 273 ° K and the atmospheric pressure is 1 atm.
  • the atmospheric pressure sensor may be held in the anemometer case.
  • the case may have an opening for guiding the air pressure outside the case to the atmospheric pressure sensor in the case.
  • the case may have a lid, and a gap provided between the case and the lid may be an opening.
  • the opening of the case corresponds to the shape of the atmospheric pressure sensor, and the atmospheric pressure sensor is mounted so as to prevent the opening, and the detection portion of the atmospheric pressure sensor is exposed to the outside of the case. You may arrange so that.
  • the measurement accuracy of the wind speed can be greatly improved by correcting the wind speed measurement value measured by the conventional method with the atmospheric pressure.
  • the anemometer of the present invention can accurately measure the wind speed even when it is used at a high altitude or even when the atmospheric pressure varies. Therefore, the present invention is extremely useful for a high-precision anemometer.
  • FIG. 1 is a front view, a side view, and a front view showing a probe of a thermal anemometer according to a first embodiment of the present invention.
  • FIG. 2 is a block diagram of the thermal anemometer according to this embodiment.
  • FIG. 3 is a flowchart showing the operation of the thermal anemometer according to this embodiment.
  • FIG. 4 is a block diagram of a thermal anemometer according to the second embodiment of the present invention.
  • FIG. 5 is a block diagram of a thermal anemometer according to the third embodiment of the present invention.
  • FIG. 6 is a side view showing a modification of the thermal anemometer according to the first to third embodiments of the present invention.
  • FIG. 1 (a) is a front view of a thermal anemometer according to the first embodiment of the present invention
  • FIG. 1 (b) is a side view thereof
  • FIG. 1 (c) is a front view of a probe.
  • the thermal anemometer of the present embodiment is a handy device as shown in the figure
  • a probe 11 shown in FIG. 1C is detachably attached to the upper part of the thermal anemometer main body 10.
  • the main body 10 includes a case 12 and a back cover 13 for exchanging batteries and the like.
  • a display unit 14 made of liquid crystal is provided on the front surface of the main body 10, and an operation panel 15 for various settings is provided below.
  • a substrate 16 on which an electronic circuit is mounted is provided inside the main body 10 as shown by a one-dot chain line in FIG.
  • FIG. 2 is a block diagram showing the configuration of the thermal anemometer according to this embodiment.
  • a bridge circuit 22 is constituted by resistors R1 and R2, a platinum wire 21 and a temperature sensitive resistor R3 having the same temperature coefficient as the platinum wire 21, and two midpoints of the bridge circuit 22 are feedback amplifiers for feedback. 23.
  • the bridge circuit 22 is kept in balance by feeding back the output to the bridge circuit 22.
  • one end of the bridge circuit 22 is grounded by a resistor R4, and one end of the resistor R4 is connected to the input end of the amplifier 24.
  • the output of the amplifier 24 is supplied to an A / D converter 25.
  • the A / D converter 25 sequentially converts analog signals into digital signals.
  • the thermal anemometer has an atmospheric pressure sensor 26 for measuring atmospheric pressure.
  • the atmospheric pressure sensor 26 uses an atmospheric pressure sensor using MEMS technology that measures a change in atmospheric pressure as a change in piezoresistance.
  • the atmospheric pressure sensor 26 is preferably a sensor having temperature compensation therein.
  • the atmospheric pressure sensor 26 is provided on the substrate 16 in the main body 10 shown in FIG.
  • the case 12 of the main body 10 has an opening 12a formed at an arbitrary portion. Accordingly, the pressure inside the case 12 is also the atmospheric pressure at that time, and the atmospheric pressure sensor 26 can measure the atmospheric pressure without being influenced by the external wind speed and without being influenced by the change in the air temperature. .
  • the output of the A / D converter 25 and the output from the atmospheric pressure sensor 26 are given to the CPU 27.
  • the CPU 27 executes wind speed measurement and correction calculation based on atmospheric pressure, and is connected to a program described later, a memory 28 for storing wind speed and atmospheric pressure, and an operation unit 29.
  • the output of the CPU 27 is given to the display unit 14 shown in FIG.
  • the display unit 14 displays wind speed and the like.
  • the CPU 27 multiplies a coefficient based on the output of the atmospheric pressure sensor 26 and the wind speed calculation unit 31 that converts the output from the A / D converter into the wind speed value by a conversion formula set by a predetermined processing procedure.
  • the thermal anemometer When a current is supplied to the bridge circuit 22 comprising the platinum wire 21 and the resistors R1, R2 and the temperature sensitive resistor R3, the platinum wire 21 is heated to have a resistance value corresponding to the temperature. Then, the voltage at the middle point of the bridge circuit 22 is input to a pair of input terminals of the feedback amplifier 23 and fed back from the feedback amplifier 23 to the bridge circuit 22 to heat the platinum wire 21 and bring the bridge into an equilibrium state. In this way, the wind speed U passing through the platinum wire 21 in accordance with the voltage change at both ends of the bridge circuit 22 can be measured by a known King equation.
  • a temperature sensing element R3 having the same temperature coefficient as that of the platinum wire 21 is incorporated in one side of the bridge circuit 22 so that the heat dissipation amount, that is, the temperature T of the platinum wire 21 and the wind the difference between the temperature T a (T-T a) is always set to be constant. It is assumed that this wind speed value U has been calibrated in advance so as to be an accurate value at the standard atmospheric pressure P 0 (usually 1 atmospheric pressure).
  • step S11 the atmospheric pressure data measured by the atmospheric pressure sensor 26 is taken in step S11, and the atmospheric pressure is calculated by calculation.
  • the data is stored in the memory 28 and displayed on the display unit 14 (step S12).
  • step S13 the wind speed is calculated based on the above-described equation (1)
  • step S14 the correction calculation corresponding to the atmospheric pressure is performed based on equation (2).
  • the correction value is held in the memory 28 in step S15 and displayed on the display unit 14 in step S16.
  • step S17 it is checked whether or not the time set in the timer T1 has expired.
  • step S18 the process proceeds to step S18 to check whether the timer T2 is up.
  • the relationship between the timers T1 and T2 is T1 ⁇ T2. If the timer T2 has not expired, the process returns to step S13 to repeat the wind speed measurement and the correction calculation process. In this way, the wind speed value can be corrected at each timing of the timer T1 and stored in the memory 28 as data.
  • step S18 If the timer T2 is up in step S18, the process returns to step S11 to perform the atmospheric pressure calculation process.
  • the atmospheric pressure value does not change abruptly, and therefore the atmospheric pressure measurement period and the wind speed measurement period are made different. In this way, the amount of data held in the memory 28 can be reduced and data can be held for a long time.
  • the wind speed value U before correction is determined by heat dissipation, and it is convenient to use it when evaluating a phenomenon depending on the air density. For example, it is effective for measuring the effect of a drying process or a cooling process of food or the like.
  • the wind speed value U before correction may be displayed alone or may be displayed simultaneously with the corrected wind speed value U m .
  • a constant temperature difference type thermal anemometer in which the difference between the temperature of the platinum wire and the ambient temperature is constant is described.
  • the temperature of the platinum wire is set to a constant high temperature
  • the ambient temperature Regardless of the invention, the present invention can also be applied to a constant-temperature thermal anemometer in which the temperature of the platinum wire is a constant high temperature.
  • a heat dissipation type anemometer widely used with a bridge circuit including a platinum wire and a temperature sensitive resistor is described as an example, but the present invention is also applicable to various types of thermal anemometers. Can be applied. Some thermal anemometers use thin wire sensors using platinum, tungsten, and platinum iridium as sensors, and those using these thin film sensors. Further, the present invention can be applied to a semiconductor sensor using a temperature sensor and a heater as a sensor element, a MEMS type sensor, and a sensor using a thermistor or a diode.
  • the measurement circuit is not limited to the one using a bridge circuit, but can be applied to one that directly measures the heat dissipation amount of each sensor element described above. In any of these sensor elements and detection circuits, when the wind speed is measured based on the heat dissipation amount, the wind speed value can be measured using the King equation.
  • the present embodiment describes a handy type anemometer, it is not limited to a handy type anemometer.
  • the corrected wind speed value is displayed on the display unit, the corrected wind speed value data may be output to the outside.
  • the probe is directly connected to the main body of the thermal anemometer.
  • the block indicated by the alternate long and short dash line in FIG. 4 including the probe and its peripheral circuit is measured.
  • 40 is connected to the main body 50 via interfaces (IF) 41 and 51.
  • IF interfaces
  • only the measurement unit 40 is arranged in a measurement region separated from the main body unit 50.
  • the measurement unit 40 may be connected to the main body unit 50 with a long wired wire, or the IFs 41 and 51 may be wireless IFs and connected without contact. Good. Even in such a case, the atmospheric pressure in the measurement environment can be accurately measured by the atmospheric pressure sensor in the main body 50, and the wind speed value corrected with the atmospheric pressure can be calculated.
  • the wind speed value (m / s) is multiplied by the cross-sectional area of the measurement part, assuming that the wind speed is the same at all positions of the cross-section of the measurement part. Can obtain the air volume (m 3 / s).
  • the standard state that is, the temperature is 273 ° K. so that the air flow value can always be calculated and compared under the same conditions.
  • the normal correction for converting to the air flow value when the atmospheric pressure is 1 atm is performed and displayed as the normal correction value.
  • the anemometer of the third embodiment includes a wind temperature sensor 42 in the measurement unit 40, and outputs from the wind temperature sensor 42 and output from the amplifier 24 via a multiplexer (MPX) 43.
  • MPX multiplexer
  • the CPU 27 has an air volume calculation unit 34 that performs normal correction using the temperature value from the air temperature sensor 42.
  • Other configurations are almost the same as those of the second embodiment.
  • the cross-sectional area of the duct or wind tunnel in which the measuring unit 40 of the anemometer is arranged is input from the operation unit 29.
  • the air volume calculation part 34 shall calculate the normal air volume converted into 1 atmosphere at 273 degrees K based on following Formula.
  • the air volume obtained by multiplying the measured wind speed value U m by the cross-sectional area of the duct is Q 1
  • the standard state is 273 ° K (T 0 )
  • the standard pressure P 0 is 1013 hPa (1 atmosphere)
  • the measurement unit 40 If the absolute temperature at the time of measurement is T m and the atmospheric pressure at that time is P m (hPa), the normal air volume Q n is expressed by the following equation.
  • Q n Q 1 ⁇ P m ⁇ T 0 / (P 0 ⁇ T m ) (3)
  • the anemometer of this embodiment inputs the cross-sectional area of the duct in advance, and displays or outputs the calculated wind speed value, the wind speed value U m corrected based on the wind speed value, and the normal air volume Q n. it can. By performing the normal correction in this way, it is possible to easily compare and evaluate daily changes in air volume even when the usage environment changes. Further, the wind speed value converted to the standard state of 273 ° K and 1 atm may be output without multiplying the corrected wind speed value U m by the cross-sectional area.
  • the opening 12a is provided in a part of the case 12 as shown in FIG. 1B.
  • the side view of FIG. 26 may be connected by a tube 12c so that the atmospheric pressure sensor 26 can reliably detect the external atmospheric pressure.
  • an opening 12 d that matches the shape of the atmospheric pressure sensor 26 is provided in a part of the case 12, the atmospheric pressure sensor 26 is fitted into the opening 12 d, and the detection surface of the atmospheric pressure sensor 26 is placed on the detection surface of the case 12. You may comprise so that it may be exposed outside. Further, as shown in FIG.
  • a slight gap 13a is provided between the back cover 13 and the case 12 which are detachably attached to the back surface of the case 12, and the atmospheric pressure is reduced to the case using the gap 13a. 12 may be guided to the atmospheric pressure sensor 26 in the inside.
  • the present invention can accurately measure the wind speed value regardless of the atmospheric pressure, it is useful as an anemometer for various uses such as industrial use.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Measuring Fluid Pressure (AREA)
  • Indicating Or Recording The Presence, Absence, Or Direction Of Movement (AREA)

Abstract

L'invention porte sur un dispositif de mesure de vitesse de vent thermique, dans lequel dispositif un capteur de vitesse de vent thermique est utilisé, et dans lequel la quantité de dissipation de chaleur varie, en fonction de la vitesse de vent, quand un capteur de vitesse de vent thermique est alimenté par un courant électrique et chauffé, et une vitesse de vent peut être mesurée sur la base de la variation de la quantité de dissipation de chaleur. Ce dispositif de mesure de vitesse de vent a un capteur de pression atmosphérique (26) pour mesurer une pression atmosphérique monté à l'intérieur d'un boîtier (12) du corps principal (10) du dispositif de mesure de vitesse de vent. Des valeurs de vitesse de vent mesurées par le dispositif de mesure de vitesse de vent thermique sont corrigées, affichées, et maintenues sur la base de la pression atmosphérique. Il est ainsi possible d'obtenir des valeurs de vitesse de vent précises qui ont été corrigées sur la base de la pression atmosphérique dans l'emplacement mesuré.
PCT/JP2012/078132 2012-10-31 2012-10-31 Dispositif de mesure de vitesse de vent WO2014068693A1 (fr)

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JP2014544113A JP6200896B2 (ja) 2012-10-31 2012-10-31 風速計
PCT/JP2012/078132 WO2014068693A1 (fr) 2012-10-31 2012-10-31 Dispositif de mesure de vitesse de vent

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PCT/JP2012/078132 WO2014068693A1 (fr) 2012-10-31 2012-10-31 Dispositif de mesure de vitesse de vent

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104991087A (zh) * 2015-06-19 2015-10-21 东南大学 一种具有片上自标定功能的mems热式风速传感器

Citations (4)

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Publication number Priority date Publication date Assignee Title
US4070908A (en) * 1976-09-28 1978-01-31 The Boeing Company Anemometer compensator linearizer
JPH03186767A (ja) * 1989-12-18 1991-08-14 Toyo Netsu Kogyo Kk 気流計測装置
JPH04332867A (ja) * 1991-05-07 1992-11-19 Nippon Kagaku Kogyo Kk 熱線風速計
JP2001221667A (ja) * 2000-02-07 2001-08-17 Ngk Spark Plug Co Ltd ダクト用風量計

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3193241B2 (ja) * 1994-08-22 2001-07-30 株式会社半導体エネルギー研究所 計測装置
JP2004309202A (ja) * 2003-04-03 2004-11-04 Kona Sapporo Kk 風速、風量センサ
FR2912220B1 (fr) * 2007-02-01 2009-04-24 Airbus France Sas Dispositif et procede de mesure de vitesse et de direction d'ecoulement de fluide gazeux
JP5113894B2 (ja) * 2010-09-27 2013-01-09 株式会社コスモ計器 流量計測方法及びそれを使った流量計測装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4070908A (en) * 1976-09-28 1978-01-31 The Boeing Company Anemometer compensator linearizer
JPH03186767A (ja) * 1989-12-18 1991-08-14 Toyo Netsu Kogyo Kk 気流計測装置
JPH04332867A (ja) * 1991-05-07 1992-11-19 Nippon Kagaku Kogyo Kk 熱線風速計
JP2001221667A (ja) * 2000-02-07 2001-08-17 Ngk Spark Plug Co Ltd ダクト用風量計

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104991087A (zh) * 2015-06-19 2015-10-21 东南大学 一种具有片上自标定功能的mems热式风速传感器
CN104991087B (zh) * 2015-06-19 2017-10-27 东南大学 一种具有片上自标定功能的mems热式风速传感器

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JPWO2014068693A1 (ja) 2016-09-08

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