Method of and apparatus for measuring the molecular weight of a gas
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01N-029/02
G01N-009/00
G01N-029/036
출원번호
US-0989232
(2011-11-28)
등록번호
US-9459191
(2016-10-04)
우선권정보
EP-10192972 (2010-11-29)
국제출원번호
PCT/EP2011/071208
(2011-11-28)
§371/§102 date
20130913
(20130913)
국제공개번호
WO2012/072596
(2012-06-07)
발명자
/ 주소
Downie, Neil Alexander
출원인 / 주소
Air Products and Chemicals, Inc.
대리인 / 주소
Zelson, Larry S.
인용정보
피인용 횟수 :
0인용 특허 :
36
초록▼
There is provided a meter for measuring the molecular weight of a gas, the meter comprising a housing having an inlet and an interior for receiving said gas to be measured, a sensor assembly comprising a high-frequency planar piezoelectric crystal oscillator located within said housing so that, in u
There is provided a meter for measuring the molecular weight of a gas, the meter comprising a housing having an inlet and an interior for receiving said gas to be measured, a sensor assembly comprising a high-frequency planar piezoelectric crystal oscillator located within said housing so that, in use, the piezoelectric crystal oscillator is in contact with said gas, said sensor assembly being arranged: to drive the piezoelectric crystal oscillator such that the piezoelectric crystal oscillator resonates at a single resonant frequency; to measure said single resonant frequency of said piezoelectric crystal oscillator to determine the density of gas; and to determine from the density, determined or pre-determined pressure of the gas and determined or pre-determined temperature of the gas, the molecular weight of the gas.
대표청구항▼
1. A method of measuring the molecular weight of a gas, the method comprising: a) driving single high-frequency planar piezoelectric crystal oscillator in contact with the gas utilizing a drive circuit, such that the piezoelectric crystal oscillator resonates at a single resonant frequency despite c
1. A method of measuring the molecular weight of a gas, the method comprising: a) driving single high-frequency planar piezoelectric crystal oscillator in contact with the gas utilizing a drive circuit, such that the piezoelectric crystal oscillator resonates at a single resonant frequency despite changes in the Q factor of the piezoelectric oscillator; andb) measuring said single resonant frequency of said piezoelectric crystal to determine the density of gas; andc) determining the molecular weight of the gas from the density, a determined or pre-determined pressure of the gas, and a determined or pre-determined temperature of the gas based on a change in frequency being linearly proportional to a change in density. 2. A method according to claim 1, further comprising measuring the pressure of the gas. 3. A method according to claim 2, wherein the pressure of the gas is measured using an electronic pressure sensor. 4. A method according to claim 1, wherein the pre-determined pressure of the gas is the fixed output pressure of a gas regulator located upstream of said oscillator. 5. A method according to claim 1, wherein the pre-determined pressure of the gas is atmospheric pressure. 6. A method according to claim 1, further comprising measuring the temperature of the gas with a temperature sensor. 7. A meter for measuring the molecular weight of a gas, the meter comprising a housing having an inlet and an interior for receiving said gas to be measured, a sensor assembly comprising a single high-frequency planar piezoelectric crystal oscillator located within said housing so that, in use, the single piezoelectric crystal oscillator is in contact with said gas, said sensor assembly being arranged: to drive the piezoelectric crystal oscillator such that the piezoelectric crystal oscillator resonates at a single resonant frequency despite changes in the Q factor of the piezoelectric oscillator;to measure said single resonant frequency of said piezoelectric crystal oscillator to determine the density of gas; andto determine from the density, a determined or pre-determined pressure of the gas, and a determined or pre-determined temperature of the gas based on a change in frequency being linearly proportional to a change in density, the molecular weight of the gas. 8. A meter according to claim 7, wherein the sensor assembly comprises a drive circuit comprising a Darlington pair arranged in a feedback configuration from a common emitter amplifier. 9. A meter according to claim 7, further comprising a pressure sensor for measuring the pressure of the gas. 10. A meter according to claim 9, wherein said pressure sensor is an electronic pressure sensor. 11. A meter according to claim 7, wherein the meter is located downstream of a fixed pressure regulator, wherein the pressure of the gas has a predetermined value based on the output of said fixed pressure regulator. 12. A meter according to claim 7, further comprising a restricted orifice upstream of said inlet and an outlet to atmosphere downstream of said inlet, wherein said pre-determined pressure of gas is atmospheric pressure. 13. A meter according to claim 7, wherein the sensor assembly further comprises a temperature sensor. 14. A method or meter according to claim 7, wherein said piezoelectric crystal oscillator comprises at least two planar tines. 15. A meter according to claim 7, wherein said piezoelectric crystal oscillator has a resonant frequency of 32 kHz or greater. 16. A computer program product executable by a programmable processing apparatus, comprising one or more software portions for performing the steps of claim 1. 17. A computer usable storage medium having a computer program product according to claim 16 stored thereon. 18. A method according to claim 1, wherein said piezoelectric crystal oscillator comprises at least two planar tines. 19. A method according to claim 1, wherein said piezoelectric crystal oscillator has a resonant frequency of 32 kHz or greater.
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