CN108548631A - One kind can excited gas pressure vessel pressure measurement method - Google Patents
One kind can excited gas pressure vessel pressure measurement method Download PDFInfo
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- CN108548631A CN108548631A CN201810342122.7A CN201810342122A CN108548631A CN 108548631 A CN108548631 A CN 108548631A CN 201810342122 A CN201810342122 A CN 201810342122A CN 108548631 A CN108548631 A CN 108548631A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
- G01L11/04—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00 by acoustic means
- G01L11/06—Ultrasonic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
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Abstract
The invention discloses one kind can excited gas (diatomic or polyatomic molecule gas, such as：Natural gas, carbon dioxide, chlorine) pressure vessel pressure measurement method, placement frequency is respectively f in gas pressure vessel1And f2Two pairs of ultrasonic probes and thermocouple, two pairs of ultrasonic probes obtain two selected frequency point f respectively1And f2Upper acoustical absorptivity α (f1)、α(f2) and velocity of sound c (f1)、c(f2) measured value, be used for synthetic gas sound relaxation frequency fm；The current gas temperatures obtained by thermocouple measurement obtain the gas reference sound relaxation frequency f under current gas temperatures in 1 standard atmospheric pressure (i.e. 1atm=101.325kPa) with lookup table mode0；By synthetic sound relaxation frequency fmWith reference sound relaxation frequency f0Obtain gas container pressure.The present invention has many advantages, such as that on-line checking, non-destructive testing, quick response, micro-low power consumption, composition is simple, work long hours stable and high certainty of measurement.
Description
Technical field
The present invention relates to pressure in gas pressure vessel to monitor field, and in particular to one kind can excited gas pressure vessel pressure
Strong measurement method.
Background technology
One important thermal parameter of gas pressure vessel is pressure (being also known as pressure in commercial measurement).On the one hand many
Technological requirement can just attain the results expected at a certain pressure, then need the exact numerical for obtaining chamber pressure；On the other hand
In order to improve production efficiency, many chemical reactions need to carry out under high pressure, and the pressure being monitored and controlled in gas pressure vessel is
An important link in entire production process；Third, production, some operation errors in transportational process or generation are violent, different
Normal chemical reaction can cause pressure in container to increase rapidly, to prevent the damage of pressure vessel and the generation of accident, should in real time,
Effectively monitor the pressure status in container.Different according to sensitive components and transfer principle, traditional pressure detection method is usual
Four classes, i.e. liquid manometer, flexible type pressure gauge, electrical distance transmitting formula manometer and physical property type pressure sensor can be divided into.Gas
Pressure vessel has the development trends such as high parameter, large scale, long-term operation.However, traditional gas pressure vessel pressure is surveyed
The shortcomings that amount method is detected there are of high cost, realization complexity, response time longer and unsuitable gas on-site.Therefore, one is studied
Kind low cost, the gas pressure vessel pressure detection method for forming non-invasive that is simple, can monitoring in real time are of great significance.
For sound wave when that can propagate in excited gas (diatomic or polyatomic molecule gas), the translation energy of gas molecule is in sound
It can increase first when compression, increased part translation energy may enter intramolecule by the inelastic collision between gas molecule
Vibration mode brings it about energy level excitation.This part sound excitation can hot relaxation process then occur when sound expands and be lost,
And then it influences acoustic propagation characteristic and sound relaxation with frequency change is caused to absorb.Vibration mode temperature change is opposite in relaxation process
It is referred to as the vibration relaxation time in the phase lag times of translation temperature or sound wave variation.Relaxation time is can excited gas molecule
Internal and external degree of freedom energy transfer rat macroscopic view embody, and molecule internal and external degree of freedom energy transfer rat by ambient temperature,
The factors such as pressure and gas molecule vibration frequency, quality, geometry, ingredient composition codetermine.Work as the relaxation time
When much larger than acoustics amount transformation period (i.e. the inverse of acoustic frequency), and when being much smaller than acoustics amount transformation period in the relaxation time,
Energy exchange does not occur between internal and external degree of freedom, does not have relaxation and absorbs generation；Only when the two is close, internal and external degree of freedom
Between energy exchange has occurred, just will produce relaxation absorption.This cause can excited gas will appear " bell " with peak point
Sound absorption is composed.Frequency corresponding to the peak point of sound absorption spectrum is known as sound relaxation frequency.Applicant is by the discovery sound that studies for a long period of time
Relaxation frequency is by molecule internal and external degree of freedom thermal capacitance, acoustics amount transformation period and the matching degree in molecular vibration relaxation time, external rings
Border temperature and pressure are codetermined.Sound relaxation frequency is proportional to environment temperature, and sound relaxation frequency has an inverted linear proportionality to main relaxation mistake
In the relaxation time of journey, pressure increases so that molecular collision rate increase causes relaxation time to reduce, so that sound relaxation frequency
Linearly it is proportional to environmental stress.In addition, can synthetic sound relaxation frequency by acoustical absorptivity on two frequency points and velocity of sound measured value.
So the pressure information in gas container can be obtained by the sounding magnitude on two frequency points.Specifically, sound absorption spectrum peak point
Corresponding sound relaxation frequency fmCan be by constituting three elements of main relaxation process effective heat capacity --- the sum of translation and rotation thermal capacitanceVibration coupling thermal capacitanceRelaxation time τ codetermines, i.e.,：
Wherein, R=8.31Jmol-1K-1It is molar gas constant, the sum of translation and rotation thermal capacitanceIt is only dependent upon gas point
Son geometry and, vibration coupling thermal capacitance unrelated with environment temperature and pressureIt is respectively to vibrate thermal capacitance in gas to pass through V-V
Energy transfer, which couples to be formed, is proportional to temperature and unrelated with pressure, and τ was proportional to temperature and had an inverted linear proportionality to pressure the relaxation time.It can
See, on the one hand, for the gas of certain ingredients, fmIt is proportional to environment temperature；On the other hand, for certain ingredients can excited gas
Body, when one timing of environment temperature, sound relaxation frequency can linearly increase with the increase of pressure.
Ultrasonic probe have low cost and low-power consumption, fast transient response, be easily installed and safeguard, pop one's head in it is durable, can be into
Row non-invasive measurement is suitable for flammable explosive gas environmental advantages so that it is widely used in metallurgy, ship, machinery, food, stone
The ultrasonic inspections of the various industries such as oil, automobile, medical treatment, chemistry, bioengineering, environmental project, ranging, thickness measuring, leak detection, medical treatment at
As diagnosis and process control etc..
The present invention propose it is a kind of be different from traditional trepanning impulse formula based on ultrasonic relaxation frequency non-intrusion type gas pressure
The pressure measurement method of container.This method has on-line checking, non-destructive testing, quick response, micro-low power consumption, composition simple, long
The advantages that time service stabilization and high certainty of measurement.The present invention is suitable for storage can excited gas (diatomic or polyatom point
Sub- gas) pressure of pressure vessel monitors measurement in real time.For example, natural gas, which is one kind, can excite mixed gas, main component
It is methane, also contains other gases such as a small amount of ethane, butane, pentane, carbon dioxide, nitrogen, oxygen, vapor.In natural gas
The content (molar fraction) of energy ingredient methane would generally be distributed in the difference in the place of production between 70% -98%.This patent can
Real-time monitoring suitable for natural gas pressure vessel pressure measures.
Invention content
To solve deficiency in the prior art, the present invention provide one kind can excited gas pressure vessel pressure measurement method,
Solving traditional gas pressure vessel pressure measurement method, there are of high cost, realization is complicated, the response time is longer and unsuitable
The problem of gas on-site detects.
In order to realize that above-mentioned target, the present invention adopt the following technical scheme that：One kind can the survey of excited gas pressure vessel pressure
Amount method, it is characterised in that：
1) placement frequency is respectively f in gas pressure vessel1And f2Two pairs of ultrasonic probes and thermocouple, two pairs are super
It is f that sonic probe, which is respectively used to measurement frequency,1And f2When gas in acoustical absorptivity and the velocity of sound, thermocouple is for measuring gas temperature
Angle value；
2) two selected frequency point f are obtained respectively using two pairs of ultrasonic probes1And f2Upper acoustical absorptivity α (f1)、α(f2)
With velocity of sound c (f1)、c(f2) measured value；
3) two frequency point sounding magnitude synthetic sound relaxation frequencies are utilized, by the sound relaxation frequency f of formula (4) synthetic gasmFor：
4) gas in gas pressure vessel is measured in advance depresses the sound relaxation frequency value under different temperatures in 1 normal atmosphere
As required reference value of tabling look-up；The current gas temperatures obtained by thermocouple measurement in step 1), are worked as by lookup table mode
Gas reference sound relaxation frequency f at preceding temperature in 1 standard atmospheric pressure0；
5) the sound relaxation frequency f by being synthesized in step 3)mThe reference sound relaxation frequency f to table look-up with step 4)0, meter
Calculation obtains gas container pressure P=fm/f0。
One kind above-mentioned can excited gas pressure vessel pressure measurement method, it is characterized in that：The step 2), specific steps
Including：
(1) exponential damping law, i.e. p (x)=p are obeyed in the variation of acoustic pressure0e-αx, wherein α is acoustical absorptivity or sound
It is napier/rice to press absorption coefficient, unit；X is propagation distance, i.e., the distance between each pair of probe；p0To send the sound of sonic probe
Pressure, p (x) are acoustic pressures when sound wave reaches reception sonic probe after distance x is propagated；Probe transducers telecommunications is sent by record
Number peak A0It is followed by the probe transducers electrical signal peak A (x) that quiets down with by distance x propagation, utilizes formula α=ln (A0/A
(x))/x=ln (p0/ p (x)) two selected frequency point f can be calculated in/x1And f2Upper acoustical absorptivity α (f1)、α(f2)；
(2) velocity of sound c is measured using time difference method, using propagation time t of the timer record sound wave between receiving and dispatching sonic probe,
Two selected frequency point f are calculated using formula c=x/t1And f2Upper acoustic propagation velocity c (f1) and c (f2)。
One kind above-mentioned can excited gas pressure vessel pressure measurement method, it is characterized in that：The step 3) utilizes two frequencies
Point sounding magnitude synthetic sound relaxation frequency, specific steps include：
(1) theoretical according to Kneser classics information bodies vibration relaxation, it is expressed as with the sound absorption spectrum μ (f) of acoustic frequency variation：
Wherein, f is acoustic frequency, and λ is that sound wave is long, fmIt is sound relaxation frequency, μmIt is the amplitude of sound absorption spectrum maximum value, α (f)
It is acoustical absorptivity with frequency change；
(2) two pairs of ultrasonic probes are in two selected frequency point f1And f2After measuring acoustical absorptivity and the velocity of sound respectively, calculate
To two selected frequency point f1And f2Sound absorption spectrum μ (f1)、μ(f2) be：
μ(f1)=α (f1)c(f1)/f1,μ(f2)=α (f2)c(f2)/f2 (2)
(3) available by formula (1) and (2)：
Two equatioies in simultaneous formula (3) can obtain the sound relaxation frequency f of gasm：
One kind above-mentioned can excited gas pressure vessel pressure measurement method, it is characterized in that：The advance measurement gas pressure
It is to utilize that gas depresses the sound relaxation frequency value under different temperatures as required reference value of tabling look-up in 1 normal atmosphere in force container
Step 1) -3) two pairs of frequencies being placed in gas pressure vessel of method be respectively f1And f2Ultrasonic probe and thermocouple
It is measured.
One kind above-mentioned can excited gas pressure vessel pressure measurement method, it is characterized in that：The gas pressure vessel is deposited
Storage can excited gas, including diatomic or polyatomic molecule gas.
One kind above-mentioned can excited gas pressure vessel pressure measurement method, it is characterized in that：The sound relaxation frequency is sound
Acoustic frequency corresponding to absorption spectra peak point utilizes the sound relaxation frequency for obtaining and being calculated with reference to sound relaxation frequency harmony measured value of tabling look-up
Rate synthetic gas pressure.
The advantageous effect that the present invention is reached：The present invention can excited gas relaxation frequency acquisition gas by acoustic method measurement
The technological means of body chamber pressure gives a kind of gas pressure that is inexpensive, forming non-invasive that is simple, can monitoring in real time
Chamber pressure detection method, the present invention are different from the pressure measurement method of traditional trepanning impulse formula, this method have on-line checking,
Non-destructive testing, quick response, micro-low power consumption, composition is simple, works long hours and stablizes and the advantages that high certainty of measurement, be applicable in
In storage can excited gas (diatomic or polyatomic molecule gas, such as：Natural gas, carbon dioxide, chlorine) pressure vessel
Pressure monitors measurement in real time.
Description of the drawings
Fig. 1 is present system design diagram；
Fig. 2 is flow chart of the method for the present invention；
Fig. 3 is 2%N2- 98%CH4The song of sound relaxation frequency value when 1 normal atmosphere is depressed, and temperature is 270K~350K
Line.
Specific implementation mode
The invention will be further described below in conjunction with the accompanying drawings.Following embodiment is only used for clearly illustrating the present invention
Technical solution, and not intended to limit the protection scope of the present invention.
As illustrated in fig. 1 and 2, a kind of gas pressure vessel pressure measurement method, includes the following steps：
1) placement frequency is respectively f in gas pressure vessel1And f2Two pairs of ultrasonic probes and a thermocouple, two
It is f to be respectively used to measurement frequency to ultrasonic probe1And f2When gas in acoustical absorptivity and acoustic velocity value, that is, obtain sounding magnitude,
For synthetic sound relaxation frequency；Thermocouple is for measuring gas temperature angle value；f1And f2According to gaseous species and surveyed pressure range into
The specific setting of row.For example, for containing CH4、CO2、Cl2Etc. single or mixed gas can be excited, if surveyed pressure range exists
When 0.01-50atm, f1And f2It can be selected between 20kHz-200kHz；If for surveyed pressure range in 50atm-250atm
When, f1And f2It can be selected between 200kHz-1000KHz.
2) two frequency point f in gas1And f2The measurement of upper acoustical absorptivity and the velocity of sound：
Exponential damping law, i.e. p (x)=p are obeyed in the variation of acoustic pressure0e-αx, wherein α is that acoustical absorptivity or acoustic pressure are inhaled
Coefficient is received, unit is napier/rice；X is propagation distance, i.e., the distance between each pair of probe, p0To send the acoustic pressure of sonic probe, p
(x) be sound wave reached after distance x is propagated receive sonic probe when acoustic pressure；Probe transducers electric signal peak is sent by record
Value A0It is followed by the probe transducers electrical signal peak A (x) that quiets down with by distance x propagation, utilizes formula α=ln (A0/ A (x))/x=
ln(p0/ p (x)) two selected frequency point f can be calculated in/x1And f2Upper acoustical absorptivity α (f1)、α(f2)。
Time difference method measurement can be used in velocity of sound c, using a monolithic processor controlled timer record sound wave in transmitting-receiving sonic probe
Between propagation time t, two selected frequency point f can be calculated using formula c=x/t1And f2Upper acoustic propagation velocity c (f1)
With c (f2)。
3) two frequency point sounding magnitude synthetic sound relaxation frequencies are utilized：It is theoretical according to Kneser classics information bodies vibration relaxation,
It can be expressed as with the sound absorption spectrum μ (f) of acoustic frequency variation：
Wherein, f is acoustic frequency, and λ is that sound wave is long, fmIt is sound relaxation frequency, μmIt is the amplitude of sound absorption spectrum maximum value, α (f)
It is acoustical absorptivity with frequency change；
Two pairs of ultrasonic probes are in two selected frequency point f1And f2After measuring acoustical absorptivity and the velocity of sound respectively, it is calculated
Two selected frequency point f1And f2Sound absorption spectrum μ (f1)、μ(f2) be：
μ(f1)=α (f1)c(f1)/f1,μ(f2)=α (f2)c(f2)/f2 (2)
It is available by formula (1) and (2)：
Two equatioies in simultaneous formula (3) can obtain：
Formula (4) shows using two frequency point sounding magnitudes, i.e., two selected frequency point f1And f2Upper acoustical absorptivity α (f1)、
α(f2) and acoustic propagation velocity c (f1) and c (f2) synthesis obtain sound relaxation frequency fm。
4) environment temperature can also influence the size of gas sound relaxation frequency, first pass through step 1) -3 in advance) method obtain gas
Gas depresses the reference sound relaxation frequency value under different temperatures in 1 normal atmosphere in body pressure vessel cavity；By the side of tabling look-up
Formula obtains the gas reference sound under the current gas temperatures obtained by thermocouple measurement in step 1) in 1 standard atmospheric pressure and relaxes
Henan frequency f0, the reference value as gas cavity pressure measurement under Current Temperatures.
5) be linearly proportional to the property of environmental stress using sound relaxation frequency, pass through 1) -4) in sound relaxation frequency is calculated
Rate fmWith the gas sound relaxation frequency f of the current gas temperatures tabled look-up in 1 standard atmospheric pressure0, and then synthesize and obtain gas
Body chamber pressure P=fm/f0.The selected two frequency bins f of sound relaxation frequency algorithm that this patent uses1And f2As long as relaxing in sound
Henan, which absorbs significant frequency domain, can accurately synthesize pressure values.
Embodiment：
Assuming that stored in gas pressure vessel is 98%CH4- 2%N2Natural gas, the frequency difference of two pairs of ultrasonic probes
For f1=40kHz and f2=125kHz.
Example 1 (positive pressure environment, it is assumed that be 10atm)：
1) under current pressure environment, two pairs of ultrasonic probes measure two frequency bins f respectively1=40kHz and f2=125kHz；
2) acoustical absorptivity α (f are obtained1)=0.191m-1、α(f2)=1.846m-1With velocity of sound c (f1)=443.7m/s, c
(f2)=443.8m/s；
3) it can be calculated using two frequency point sounding magnitude composition algorithms of sound relaxation frequency：
4) it is 295K by thermocouple measurement gas temperature T；Fig. 3 is 2%N2- 98%CH4In 1 standard atmospheric pressure (1atm
=101.325kPa) under, the curve of sound relaxation frequency value, is known by lookup table mode as temperature T when temperature is 270K~350K
For 295K when, sound relaxation frequency f0=1.190 × 105Hz；
5) f by obtainingmAnd f0Gas container pressure P=f can be calculatedm/f0≈10atm≈10atm。
Example 2 (positive pressure environment, different with 1 chamber pressure of embodiment, it is assumed that be 5atm)：
1) under current pressure environment, two pairs of ultrasonic probes measure two frequency bins f respectively1=40kHz and f2=125kHz
2) acoustical absorptivity α (f are obtained1)=0.3806m-1、α(f2)=3.573m-1With velocity of sound c (f1)=443.8m/s, c
(f2)=443.9m/s；
3) it can be calculated using two frequency point sounding magnitude composition algorithms of sound relaxation frequency
4) it is 295K by thermocouple measurement gas temperature T；Known when temperature T is 295K by lookup table mode by Fig. 3,
Sound relaxation frequency f0=1.190 × 105Hz；
5) f by obtainingmAnd f0Gas container pressure P=f can be calculatedm/f0≈5atm。
Example 3 (subnormal ambient, it is assumed that be 0.1atm)：
1) under current pressure environment, two pairs of ultrasonic probes measure two frequency bins f respectively1=40kHz and f2=125kHz
2) acoustical absorptivity α (f are obtained1)=1.555m-1、α(f2)=1.678m-1With velocity of sound c (f1)=447.9m/s, c
(f2)=448.2m/s；
3) it can be calculated using two frequency point sounding magnitude composition algorithms of sound relaxation frequency
4) it is 295K by thermocouple measurement gas temperature T, is known when temperature T is 295K by lookup table mode by Fig. 3,
Sound relaxation frequency f0=1.190 × 105Hz；
5) f by obtainingmAnd f0Gas container pressure P=f can be calculatedm/f0≈0.1atm.
Pressure measurement method proposed by the present invention is different from the pressure measurement method of traditional trepanning impulse formula, and this method has
On-line checking, non-destructive testing, quick response, micro-low power consumption, composition is simple, work long hours stable and measurement accuracy height etc.
Advantage.The present invention be suitable for storage can excited gas (diatomic or polyatomic molecule gas, such as：Natural gas, carbon dioxide,
Chlorine) pressure of pressure vessel monitors measurement in real time.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
Claims (6)
1. one kind can excited gas pressure vessel pressure measurement method, it is characterised in that：
1) placement frequency is respectively f in gas pressure vessel1And f2Two pairs of ultrasonic probes and thermocouple, two pairs ultrasound visit
It is f that head, which is respectively used to measurement frequency,1And f2When gas in acoustical absorptivity and the velocity of sound, thermocouple is for measuring gas temperature angle value；
2) two selected frequency point f are obtained respectively using two pairs of ultrasonic probes1And f2Upper acoustical absorptivity α (f1)、α(f2) and the velocity of sound
c(f1)、c(f2) measured value；
3) two frequency point sounding magnitude synthetic sound relaxation frequencies are utilized, by the sound relaxation frequency f of formula (4) synthetic gasmFor：
4) gas in gas pressure vessel is measured in advance depresses the sound relaxation frequency value conduct under different temperatures in 1 normal atmosphere
It tables look-up required reference value；The current gas temperatures obtained by thermocouple measurement in step 1) obtain current temperature by lookup table mode
Gas reference sound relaxation frequency f under degree in 1 standard atmospheric pressure0；
5) the sound relaxation frequency f by being synthesized in step 3)mThe reference sound relaxation frequency f to table look-up with step 4)0, calculate
To gas container pressure P=fm/f0。
2. one kind according to claim 1 can excited gas pressure vessel pressure measurement method, it is characterized in that：The step
2), specific steps include：
(1) exponential damping law, i.e. p (x)=p are obeyed in the variation of acoustic pressure0e-αx, wherein α is that acoustical absorptivity or acoustic pressure absorb
Coefficient, unit are napier/rice；X is propagation distance, i.e., the distance between each pair of probe；p0To send the acoustic pressure of sonic probe, p (x)
It is acoustic pressure when sound wave reaches reception sonic probe after distance x is propagated；Probe transducers electrical signal peak is sent by record
A0It is followed by the probe transducers electrical signal peak A (x) that quiets down with by distance x propagation, utilizes formula α=ln (A0/ A (x))/x=ln
(p0/ p (x)) two selected frequency point f can be calculated in/x1And f2Upper acoustical absorptivity α (f1)、α(f2)；
(2) velocity of sound c is measured using time difference method, using propagation time t of the timer record sound wave between receiving and dispatching sonic probe, is utilized
Two selected frequency point f are calculated in formula c=x/t1And f2Upper acoustic propagation velocity c (f1) and c (f2)。
3. one kind according to claim 1 can excited gas pressure vessel pressure measurement method, it is characterized in that：The step
3) using two frequency point sounding magnitude synthetic sound relaxation frequencies, specific steps include：
(1) theoretical according to Kneser classics information bodies vibration relaxation, it is expressed as with the sound absorption spectrum μ (f) of acoustic frequency variation：
Wherein, f is acoustic frequency, and λ is that sound wave is long, fmIt is sound relaxation frequency, μmBe sound absorption spectrum maximum value amplitude, α (f) be with
The acoustical absorptivity of frequency variation；
(2) two pairs of ultrasonic probes are in two selected frequency point f1And f2After measuring acoustical absorptivity and the velocity of sound respectively, it is calculated two
A selected frequency point f1And f2Sound absorption spectrum μ (f1)、μ(f2) be：
μ(f1)=α (f1)c(f1)/f1,μ(f2)=α (f2)c(f2)/f2 (2)
(3) available by formula (1) and (2)：
Two equatioies in simultaneous formula (3) can obtain the sound relaxation frequency f of gasm：
4. one kind according to claim 1 can excited gas pressure vessel pressure measurement method, it is characterized in that：It is described advance
It measures the sound relaxation frequency value that gas is depressed in 1 normal atmosphere under different temperatures in gas pressure vessel and is used as required ginseng of tabling look-up
It is to utilize step 1) -3 to examine value) two pairs of frequencies being placed in gas pressure vessel of method be respectively f1And f2Ultrasonic probe
And measured by thermocouple.
5. one kind according to claim 1 can excited gas pressure vessel pressure measurement method, it is characterized in that：The gas
Pressure vessel storage can excited gas, including diatomic or polyatomic molecule gas.
6. one kind according to claim 1 can excited gas pressure vessel pressure measurement method, it is characterized in that：The sound is speeded
Henan frequency is the acoustic frequency corresponding to sound absorption spectrum peak point, is calculated with reference to sound relaxation frequency harmony measured value using tabling look-up to obtain
Sound relaxation frequency synthesis gas pressure intensity.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110987286A (en) * | 2019-12-18 | 2020-04-10 | 吉林大学 | Ultrasonic air pressure detection device, method and system for low oxygen chamber |
| CN112254870A (en) * | 2020-09-30 | 2021-01-22 | 武汉德塞仪器仪表科技有限公司 | High-precision gas micro-differential pressure gauge |
| CN114002317A (en) * | 2021-10-22 | 2022-02-01 | 张克声 | Acoustic measurement method for molecular vibration frequency of diatomic gas |
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