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21. 发明专利

JPH0562832B2 失效
公开(公告)号：JPH0562832B2
公开(公告)日：1993-09-09
申请号：JP6187685
申请日：1985-03-28
申请人： TOKYO GAS CO LTD
发明人： UEHARA KYOJI , TANAKA HIROAKI , UEKI TAKASHI , TAI HIDEO
IPC分类号： G01N21/39 , H01S3/00 , H01S3/08 , H01S3/101 , H01S3/105 , H01S3/106 , H01S3/139 , H01S5/0683 , H01S5/14 , H01S5/40

22. 发明专利

JPH0526804A MULTIPLE GA DETECTING DEVICE 失效
公开(公告)号：JPH0526804A
公开(公告)日：1993-02-02
申请号：JP20759991
申请日：1991-07-24
申请人： TOKYO GAS CO LTD
发明人： TAI HIDEO , YAMAMOTO KAZUNARI
IPC分类号： G01N21/39
摘要： PURPOSE:To simultaneously stabilize the oscillation wavelengths of the plurality of semiconductor laser elements of a gas detector which simultaneously detects various kinds of gases by using the semiconductor laser elements. CONSTITUTION:After the laser light of a semiconductor laser element 20a modulated to a frequency f1 and the laser light of another semiconductor laser element 20b modulated to another frequency f2 are mixed through a beam splitter 23 and passed through a reference cell 22 in which a plurality of kinds of reference gases are enclosed, the mixed laser light is received by means of a photoreceptor 24. A wavelength controller 21a for methane stabilizes the oscillation wavelength of the laser light corresponding to the frequency f1 and a wavelength controller 21b for acetylene stabilizes the oscillation wavelength of the laser light corresponding to the frequency f2.

23. 发明专利

JPH0510875A GAS DETECTION DEVICE 失效
公开(公告)号：JPH0510875A
公开(公告)日：1993-01-19
申请号：JP18689191
申请日：1991-07-01
申请人： TOKYO GAS CO LTD
发明人： YAMAMOTO KAZUNARI , TAI HIDEO
IPC分类号： G01N21/35 , G01N21/3504 , G01N21/359 , H01S3/00
摘要： PURPOSE:To enable a constituent of a plurality of kinds of mixed gases to be detected by one gas detection device. CONSTITUTION:Temperature is controlled based on a voltage which is obtained by converting a temperature of a semiconductor laser element 20 which oscillates a laser beam where a wavelength changes according to temperature by a thermocouple 37. Then, the temperature of the semiconductor laser element 20 is controlled based on a voltage corresponding to a wavelength which can be selected according to an absorption wavelength of a gas within a cell 21, thus enabling a laser beam with a plurality of different wavelengths to be oscillated by using the semiconductor laser element 20 and constituents of the mixed gas to be detected.

24. 发明专利

JPS63316486A THERMOELECTRIC AND PHOTOELECTRIC GENERATION DEVICE 失效
公开(公告)号：JPS63316486A
公开(公告)日：1988-12-23
申请号：JP15275387
申请日：1987-06-19
申请人： TOKYO GAS CO LTD
发明人： YAMAMOTO YOHEI , TAI HIDEO
IPC分类号： F23D14/16 , H01L31/04 , H01L31/042
摘要： PURPOSE:To upgrade the conversion efficiency from thermal energy to radiation energy and improve its generation efficiency of electricity by lowering the temperature of a combustion exhaust gas and reducing the principal part of sensible heat difference to radiation energy on the upstream side having a low temperature heat receiving body when the combustion exhaust gas passes the inside of a radiator. CONSTITUTION:The radiator 3 made of a porus solid is centered in the thermoelectric and photoelectric generation part and a combustion chamber 19, a vacuum space (or air preheating space) 20, a photoelectric conversion element 5, a reflecting mirror 21, a cooling water path 22 are formed at the periphery of the radiator. The reflection mirror 21 allows a radiation energy having wavelengths which are not absorbed in the photoelectric conversion element 5 to return to the side of the radiator 3 and its radiator 3 is heated and then, heat retaining energy is produced. In other words, when the exhaust gas passes through the radiator 3, the temperature of its exhaust gas is lowered and also the principal part of sensible heat difference is reduced to the upstream side having a low temperature heat receiving body as radiation energy. As a result, the conversion efficiency from partial energy corresponding to the above reduced one to radiation energy is upgraded and the generation efficiency of electricity is improved.

25. 发明专利

JPS61178622A OPTICAL FIBER SPECTROPHOTOMETRY 失效
公开(公告)号：JPS61178622A
公开(公告)日：1986-08-11
申请号：JP1872485
申请日：1985-02-04
申请人： TOKYO GAS CO LTD
发明人： TANAKA HIROAKI , UEKI TAKASHI , TAI HIDEO , YOSHINO TOSHIHIKO
IPC分类号： G01J3/02 , G01J3/42 , G01N21/27 , G01N21/55 , G01N21/552
摘要： PURPOSE:To perform the spectral diffraction of a gaseous molecule, by a small apparatus constituted so that the specific wavelength component of light incident to an optical fiber is attenuated by the absorption of an evanescent wave by a gaseous molecule. CONSTITUTION:A detection part 21a is provided to a part of the optical fiber 21 connected to a white light source 20 and a spectroscope 22 for analyzing the spectrum of light passing through the detection part 21a and a signal processing circuit 23 for processing the output of said spectroscope 22 are mounted to said fiber 21. when white light of the white light source 20 having light intensity almost uniform over a wide wavelength region is sent to the optical fiber 21, an evanescent wave appears in the open air at the detection part 21a and partially absorbed with gas present at an observation point B. As a result, the spectral characteristics of optical output detected by the spectroscope has a min. value at a wavelength, for example, lambda1. The concn. of gas can be detected according to a differential method of the absorbed light component and that of a wavelength not absorbed with the gas by the circuit.

26. 发明专利

JPH1172411A GAS DETECTING DEVICE AND METHOD THEREFOR 失效
公开(公告)号：JPH1172411A
公开(公告)日：1999-03-16
申请号：JP23215697
申请日：1997-08-28
申请人： TOKYO GAS CO LTD
发明人： TAI HIDEO , IZEKI KOYA , KOTSUBO HIRONORI , OKITA YUJI , KOMORI MITSUNORI
IPC分类号： G01M3/02 , G01M3/04 , G01M3/38
摘要： PROBLEM TO BE SOLVED: To efficiently perform an operation for gas leakage-inspection with high precision. SOLUTION: A gas detection system comprises; an LD spectral gas detecting device 1 which passes laser beams through vapor to be measured and detects a specified gas in the vapor based upon a change of strength of these passed laser beams; a mover position measuring device 5 measuring a present position; a mobile GIS 21 displaying a position where a specified gas is detected by the LD spectral gas detecting device 1 based upon an output of the mover position measuring device 5; and a vehicle 22 mounting the LD spectral gas detecting device 1, the position measuring device 5 and the mobile GIS 21.

27. 发明专利

JPH10300619A GAS LEAKAGE DETECTOR 失效
公开(公告)号：JPH10300619A
公开(公告)日：1998-11-13
申请号：JP10851797
申请日：1997-04-25
申请人： ANRITSU CORP , TOKYO GAS CO LTD
发明人： KIMURA KIYOSHI , KONDO KAZUKI , TAI HIDEO , KOMORI MITSUNORI
IPC分类号： G01M3/02 , G01M3/04 , G01M3/38
摘要： PROBLEM TO BE SOLVED: To acquire stably leaked gas and detect always stably a gas leakage with high precision without any overlook and erroneous detection. SOLUTION: Measuring means, position detecting means and data recording means are mounted in a measurement vehicle. Further, a light-emitting part 6 and a light-receiving part 7 and a gas introducing mechanism 8 are disposed in the outside part 5a of the measurement vehicle. The gas introducing mechanism 8 is formed to be in a box-like configuration enclosing an optical path of laser beams transmitted between the light-emitting part 6 and light-receiving part 7 and has a lower opening 27. Further, it is constituted by a gas introducing part 25 having a discharge hole 30 provided along the optical path and a skirt part 26 which is attached to the gas introducing part 25 so as to cover the lower opening 27 and bring it close to or in contact with the ground and has a fetching hole 32. A blower 31 and a filter 33 are disposed inside of the gas introducing part 25. Thereby, dust and dirt in gas fetched from the fetching hole 32 are removed, and it flows toward the optical path to introduce selectively leaked gas, thereby to prevent an overlook and an erroneous detection.

28. 发明专利

JPH10267839A APPARATUS FOR MEASURING CONCENTRATION OF GAS 失效
公开(公告)号：JPH10267839A
公开(公告)日：1998-10-09
申请号：JP7774797
申请日：1997-03-28
申请人： ANRITSU CORP , TOKYO GAS CO LTD
发明人： KIMURA KIYOSHI , TAI HIDEO
IPC分类号： G01N21/01 , G01N21/39
摘要： PROBLEM TO BE SOLVED: To eliminate influences of a returning light, etc., restrict a change in photodetecting signals and improve measurement resolution and stability, by modulating a laser light modulated with a predetermined frequency further with a frequency of a considerably larger multiple of the predetermined frequency, etc., in a light-absorption type gas concentration measurement apparatus using a semiconductor laser. SOLUTION: The gas concentration-measuring apparatus comprises, for instance, a semiconductor laser module including a temperature control Peltier element 4 for a semiconductor laser 3, an aspheric lens 2 and optical isolators 23, 24, etc., and an optical measuring part so constituted as minutely vibrates a detector and a light source part in a direction of an optical axis. The laser 3 is driven by a current stabilization circuit 14 with a current of a sum of a basic wave modulation current of a frequency Fm, a double-wave suppressed current and a suppressed current of, e.g. 50-500 times the Fm which suppresses a photodetection level change, thereby emitting light. In the constitution, a returning light to the laser 3 is greatly reduced, etc., so that an oscillation wavelength to absorption lines of a gas to be measured is precisely stabilized.

29. 发明专利

JPH0755949A DETECTING METHOD OF JOINT OF PIPELINE BY ACOUSTIC WAVE 失效
公开(公告)号：JPH0755949A
公开(公告)日：1995-03-03
申请号：JP20309293
申请日：1993-08-17
申请人： TOKYO GAS CO LTD
发明人： TAI HIDEO , SUZUKI KIWAMU , SATOU SOUBUN
IPC分类号： G01N29/09 , G01V1/00 , G01N29/16
摘要： PURPOSE:To enable detection of the existence and position of a joint by detecting a reflected wave appearing between a pulse-shaped acoustic wave transmitted from the other end side of a pipeline and a reflected wave from an open or closed end. CONSTITUTION:A longitudinal straight pipe part 7, for instance, of a supply pipe 1 is disconnected from a meter cock and a detecting part (an acoustic wave transmitting part 9, a receiving part 10) 11 is fitted to the upper end of the straight pipe part 7. The transmitting part 9 is constructed of a speaker converting a signal from a pulse generating means 12 into an audio signal, and an output signal of a microphone constructing the receiving part 10 is inputted to a signal processing means (CPU, etc.) 14 through a preprocessing means (an amplifier, an A/D converter, etc.) 13. A signal obtained by the processing means 14 is outputted to an output means 15. Two detection outputs of a transmitted pulse-shaped acoustic wave and a reflected wave from an open end of the pipeline 1 obtain high levels and a detection output having a low level appears between the two. This is a reflected wave from a joint. This wave can be discriminated distinctly and the presence of the joint can be detected. The position of the joint can be calculated from an acoustic wave pass time and a sound velocity.

30. 发明专利

JPH05142146A GAS MEASURING INSTRUMENT 失效
公开(公告)号：JPH05142146A
公开(公告)日：1993-06-08
申请号：JP33138291
申请日：1991-11-20
申请人： TOKYO GAS CO LTD
发明人： TAI HIDEO
IPC分类号： A61B5/08 , A61B5/083 , G01N21/35 , G01N21/3504 , G01N21/39
摘要： PURPOSE:To enable a gas measuring instrument which measures the ratio of concentration between two kinds of gases by using a semiconductor laser to accurately measure the ratio of concentration in a short time with a simple constitution without using any cooling mechanism. CONSTITUTION:After two laser beams modulated with different frequencies are mixed with each other through a beam splitter 23 and passed through a reference cell 22 in which CO2 and CO2 which is the isotope of CO2 are enclosed, the mixed laser beam are received by means of a photodetector 24 and the oscillating wavelengths of the laser beams corresponding to the absorption wavelength of the reference gases are respectively stabilized in a wavelength controllers 21a for CO2 and 21b for CO2. Then, after the mixed laser beams are transmitted through a gas containing the two kinds of gases to be measured for the ratio of concentration in a cell 25 for measurement, the laser beams are received by means of a photometer 26 and the concentrations of the CO2 and CO2 are respectively detected by means of a CO2 detector 27a and CO detector 27b. Thereafter a divider find the ratio of concentration between by dividing the concentration of CO2 by the sum of the concentrations of CO2 and CO2.

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