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1. 发明专利

JPH109562A METHOD FOR DIAGNOSING COMBUSTION STATE 失效
公开(公告)号：JPH109562A
公开(公告)日：1998-01-16
申请号：JP16614196
申请日：1996-06-26
申请人： NIPPON FURNACE KOGYO KK , TOKYO GAS CO LTD
发明人： HASEGAWA TOSHIAKI , TANAKA RYOICHI , HOSHINO TOSHIBUMI , MOCHIDA SUSUMU , KATSUSHIMA HIROKAZU , TAMURA MASAYUKI , TAI HIDEO
IPC分类号： F23N5/18 , F23N5/08 , F23N5/26
摘要： PROBLEM TO BE SOLVED: To diagnose a combustion state by judging at which level a high temperature air combustion is realized and quantitatively detecting oxygen concentration and temperature of oxidizer immediately before a combustion reaction in a furnace in relation of the high temperature air combustion. SOLUTION: CH radical emitting light intensity and C2 radical emitting light intensity are measured. Then, oxygen concentration and temperature of combustion air of oxidizer complicately changing in a furnace immediately before a combustion reaction of hydrocarbon fuel, fuel containing hydrocarbon, or fuel added with the hydrocarbon fuel or hydrocarbon as a marker are estimated from their ratio. Whether the combustion arises high temperature air combustion with extremely low velocity oxidizing exothermic reaction or not can be diagnosed from the ratio of the intensities or at which level the high temperature air combustion is can be diagnosed.

2. 发明专利

CA2038980A1 GAS DETECTION DEVICE 未知
公开(公告)号：CA2038980A1
公开(公告)日：1991-09-28
申请号：CA2038980
申请日：1991-03-25
申请人： TOKYO GAS CO LTD
发明人： UEHARA KIYOJI , TANAKA HIROAKI , MATSUURA MASAYUKI , TAI HIDEO
IPC分类号： G01N21/39 , G02B3/00 , G01N21/25
摘要： The present invention relates to a gas detection device which comprises a laser which generates a laser beam of wave length and intensity corresponding to a drive current and the temperature, and a laser drive circuit which modulates the drive power source of the laser at a specified amplitude centered around a specified temperature and a specified current value with a means of stabilizing the wavelength by which the central wavelength of the laser beam generated by the laser is stabilized at a specific position on a special gas absorption line. The device also comprises a beam detection apparatus which detects the intensity of the laser beam after the laser beam passes through the measuring object gas atmosphere, and a measuring means which performs a quantitative measurement of a specific gas based on the output of the beam detection apparatus.

3. 发明专利

DE69407068D1 未知
公开(公告)号：DE69407068D1
公开(公告)日：1998-01-15
申请号：DE69407068
申请日：1994-02-02
申请人： TOKYO GAS CO LTD
发明人： ITO TAKANORI , TAI HIDEO
IPC分类号： G01S15/10 , G01B17/00 , G01S7/52 , G01S7/526
摘要： A calibration pipe (10) having a predetermined length is connected to an end of a pipe (28) to be measured. A sound emitter (4) and a sound receiver (5) are connected to a base end of the calibration pipe. The sound emitter emits a sound into the calibration pipe and the pipe to be measured, and the sound receiver receives a sound reflected from a discontinuous portion of the pipe. A calculator is provided for calculating a period of time from emitting of the sound to receiving of the reflected sound. The length of the pipe is calculated based on speed of the sound in the calibration pipe.

4. 发明专利

DE3676530D1 未知
公开(公告)号：DE3676530D1
公开(公告)日：1991-02-07
申请号：DE3676530
申请日：1986-03-25
申请人： TOKYO GAS CO LTD
发明人： UEHARA KIYOJI , UEKI TAKASHI , TANAKA HIROAKI , 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 , G01N21/25
摘要： There is disclosed a dual-wavelength laser apparatus including a laser emitting a laser beam consisting of two wavelength components, a methane cell for controlling and equalizing gains of the two wavelength components, a cavity length modulator including a piezoelectric element for periodically modulating the cavity length of the laser, and a feedback circuit for controlling the modulation center such that the sum of outputs of the two modulated wavelength components is kept substantially constant. The feedback circuit includes a detector for detecting a laser output, a lock-in amplifier for detecting and amplifying an output from the detector, an integrator for integrating an output from the lock-in amplifier, and a high-voltage amplifier for generating a bias voltage set by the integrator.

5. 发明专利

DE69407068T2 未知
公开(公告)号：DE69407068T2
公开(公告)日：1998-03-26
申请号：DE69407068
申请日：1994-02-02
申请人： TOKYO GAS CO LTD
发明人： ITO TAKANORI , TAI HIDEO
IPC分类号： G01S15/10 , G01B17/00 , G01S7/52 , G01S7/526
摘要： A calibration pipe (10) having a predetermined length is connected to an end of a pipe (28) to be measured. A sound emitter (4) and a sound receiver (5) are connected to a base end of the calibration pipe. The sound emitter emits a sound into the calibration pipe and the pipe to be measured, and the sound receiver receives a sound reflected from a discontinuous portion of the pipe. A calculator is provided for calculating a period of time from emitting of the sound to receiving of the reflected sound. The length of the pipe is calculated based on speed of the sound in the calibration pipe.

6. 发明专利

CA1261046A DUAL-WAVELENGTH LASER APPARATUS 未知
公开(公告)号：CA1261046A
公开(公告)日：1989-09-26
申请号：CA505030
申请日：1986-03-25
申请人： TOKYO GAS CO LTD
发明人： UEHARA KIYOJI , 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 , H01S3/10
摘要： A dual-wavelength laser apparatus includes a laser emitting a laser beam consisting of two wavelength components, a methane cell for controlling and equalizing gains of the two wavelength components, a cavity length modulator including a piezoelectric element for periodically modulating the cavity length of the laser, and a feedback circuit for controlling the modulation center such that the sum of outputs of the two modulated wavelength components is kept substantially constant. The feedback circuit includes a detector for detecting a laser output, a lock-in amplifier for detecting and amplifying an output from the detector, an integrator for integrating an output from the lock-in amplifier, and a high-voltage amplifier for generating a bias voltage set by the integrator.

7. 发明专利

JP2001183470A SYSTEM, METHOD, AND DEVICE FOR DETECTING BURIED STRUCTURE 失效
公开(公告)号：JP2001183470A
公开(公告)日：2001-07-06
申请号：JP37290699
申请日：1999-12-28
申请人： TOKYO GAS CO LTD , TOHOKU TECHNO ARCH CO LTD
发明人： INOMATA WATARU , SUYAMA KENJI , SATAKE YUKINOBU , KOMORI MITSUNORI , TAI HIDEO , FUJIWARA JUN , SATO MOTOYUKI
IPC分类号： G01V3/12 , F16L1/024 , G01S7/03 , G01S13/88
摘要： PROBLEM TO BE SOLVED: To provide a system, method, and device for detecting a buried structure for detecting the existence, position, shape, or material and the like of the underground buried structure. SOLUTION: A lifting device 5-1 is supported by legs 6-1, makes a lifting pole 7-1 telescopic, and vertically moves a transmitter 9 provided for the tip of the lifting pole 7-1 in a shaft 4-1. Similarly, a lifting device 5-2 is supported by legs 6-2, makes a lifting pole 7-2 telescopic, and vertically moves a receiver 11 provided for the tip of the lifting pole 7-2 in a shaft 4-2. A computer 3 controls the lifting speed and distance and the like. The transmitter 9 transmits radio wave and the receiver 11 receives the radio waves. The computer 3 takes the received radio wave, and determines the existence, position, shape, or material and the like of a buried pipe 13, based on a waveform of the radio wave.

8. 发明专利

JPH06230120A SOUND VELOCITY CALIBRATION DEVICE FOR ACOUSTIC PIPE LINE LENGTH MEASURING SYSTEM 失效
公开(公告)号：JPH06230120A
公开(公告)日：1994-08-19
申请号：JP3953293
申请日：1993-02-03
申请人： TOKYO GAS CO LTD
发明人： ITO TAKANORI , TAI HIDEO
IPC分类号： G01S15/10 , G01B17/00 , G01S7/52 , G01S7/526
摘要： PURPOSE:To directly and accurately measure a pipe line length without any measurement error due to gas temperature, gas component in the pipe line to be measured and unknown error factors, relating to an acoustic pipe line length measuring system. CONSTITUTION:A sound generating means 4 that sends pulse-like sound wave from one end of a to-be-measured pipe line 28 into it, a sound collector means 5 that, at one end of the to-be-measured pipe line 28, collector pulse-like sound waves reflected on the other end of the pipe line 28, and a sound wave length measuring equipment 3 that, based on the time period between the time when the pulse-like sound waves are sent and the one when they are collected and also based on a sound velocity value in the pipe length, measures the length of the pipe line 28, are provided. Between one end of the to-be-measured pipe line 28 and a measurement system, a detachable sound velocity calibration pipe 10, of a fixed length, that is entirely wound up in coil is provided, and by temporarily releasing a purge valve 14, the sound velocity calibration pipe 10 is filled with the gas in the to-be-measured pipe line 28, for obtaining the length of the pipe line.

9. 发明专利

JPH0548857B2 失效
公开(公告)号：JPH0548857B2
公开(公告)日：1993-07-22
申请号：JP23755785
申请日：1985-10-25
申请人： TOKYO GAS CO LTD
发明人： TAI HIDEO , UEKI TAKASHI , TANAKA HIROAKI
IPC分类号： G01N21/39 , G01N21/59

10. 发明专利

JPS62290190A TWO-WAVELENGTH OSCILLATION LASER DEVICE 失效
公开(公告)号：JPS62290190A
公开(公告)日：1987-12-17
申请号：JP13179386
申请日：1986-06-09
申请人： TOKYO GAS CO LTD
发明人： UEHARA KIYOJI , TANAKA HIROAKI , UEKI TAKASHI , TAI HIDEO
IPC分类号： H01S5/068 , H01S5/0687 , H01S5/40
摘要： PURPOSE:To obtain the two-wavelength oscillation laser of simple constitution and control by using a laser which generate laser beams having corresponding wavelengths and output to a drive current and generating the laser beams of two different wavelengths by use of two different drive currents and applying feedback to the drive currents so as to make a modulation frequency component of the laser beams zero. CONSTITUTION:When a semiconductor laser 1 is driven by a current I1 and I2 (I2 > I1) with a current 10 as center, laser beams of wavelengths lambda1 and lambda2 are generated from the semiconductor laser 1. The wavelength lambda2 component is absorbed by methane in a methane cell 3 and by selecting a methane pressure properly, it can be made nearly the same as an output of the wavelength lambda1 component. A part of the laser beam output is detected by an optical sensor 5 and a modulation frequency component of that is detected by a lock-in amplifier 6 and is integrated by an integrator 8. A current control circuit 9 modulates the drive current between I1 and l2 at an oscillation frequency of an oscillator 7. When the modulation frequency component becomes zero by a feedback effect, a bias current I0 of a laser drive circuit 10 is retained and the oscillation is continued.

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