公开(公告)号：US06823715B2

公开(公告)日：2004-11-30

申请号：US10391016

申请日：2003-03-19

申请人： Tatsu Kobayakawa ,  Hiroshi Yamada ,  Hideki Toda ,  Sachiko Saitou

发明人： Tatsu Kobayakawa ,  Hiroshi Yamada ,  Hideki Toda ,  Sachiko Saitou

IPC分类号： G01N2902

CPC分类号： G01N29/4427 ,  G01N29/032 ,  G01N29/48 ,  G01N2291/0212 ,  G01N2291/02809 ,  G01N2291/02836 ,  G01N2291/048 ,  G01N2291/102

摘要： A gas-concentration measuring apparatus for measuring the concentration variation of gas residing in a target region. The gas-concentration measuring apparatus comprises an ultrasound-transmitter adapted to transmit an ultrasound in response to an ultrasound-generating signal having a rate of voltage change equal to or greater than a slew rate of an operational amplifier, and further adapted to output the ultrasound-generating signal. An ultrasound-receiver adapted to receive the ultrasound wave passed through the gas residing in the target region, and further adapted to convert the received ultrasound into an electrical signal serving as a received ultrasound signal is provided. A gas-concentration determiner adapted to input the ultrasound-generating signal and the received ultrasound wave signal into the operational amplifier to generate an amplified transmitting-side chopping wave and an amplified receiving-side chopping wave is further provided. The gas-concentration determiner is further adapted to compare the transmitting-side and receiving-side chopping waves independently with corresponding given threshold voltages to detect a first pair of time points when the respective chopping waves become equal to or greater than the corresponding given threshold voltages or to detect a second pair of time points when the respective chopping waves become equal to or less than the corresponding given threshold voltages. The gas-concentration determiner is further adapted to determine the concentration variation in the gas based on the pair of time points.

摘要翻译： 一种用于测量驻留在目标区域中的气体的浓度变化的气体浓度测量装置。 气体浓度测量装置包括适于响应于具有等于或大于运算放大器的转换速率的电压变化率的超声波产生信号来发送超声的超声波发射器，并且还适于输出超声波 生成信号。 提供了适于接收通过驻留在目标区域中的气体的超声波的超声波接收器，并且还适于将接收的超声波转换为用作接收的超声信号的电信号。 一种适用于将超声波产生信号和接收到的超声波信号输入到运算放大器以产生放大的发射侧斩波和放大的接收侧斩波的气体浓度确定器。 气体浓度确定器还适于将发送侧和接收侧斩波独立地与对应的给定阈值电压进行比较，以检测当各个斩波等于或大于相应的给定阈值电压时的第一对时间点 或者当相应的斩波变得等于或小于相应的给定阈值电压时，检测第二对时间点。 气体浓度确定器还适于基于该对时间点确定气体中的浓度变化。

公开(公告)号：US07201034B2

公开(公告)日：2007-04-10

申请号：US10521746

申请日：2003-07-18

申请人： Tatsu Kobayakawa ,  Hideki Toda ,  Sachiko Saito

发明人： Tatsu Kobayakawa ,  Hideki Toda ,  Sachiko Saito

IPC分类号： G01N29/02 ,  G01N29/22 ,  G01N29/44

CPC分类号： G01N29/40 ,  G01N29/032 ,  G01N29/343 ,  G01N29/48 ,  G01N2291/0212 ,  G01N2291/02809 ,  G01N2291/02818 ,  G01N2291/02836

摘要： A gas concentration measurement instrument comprises: ultrasonic wave transmitting means for transmitting an ultrasonic wave according to an ultrasonic wave generation signal composed of a group of rectangular pulse waves; ultrasonic wave receiving means for converting the ultrasonic wave transmitted through the gas in the measurement region into an electric signal to use it as an ultrasonic wave reception signal; and gas concentration measuring means for measuring the signal output time when the ultrasonic wave generation signal is outputted, generating an envelope processing signal by subjecting the ultrasonic wave reception signal to an envelope extracting processing, measuring the threshold fall time when the envelope processing signal decreases below a predetermined threshold after exceeding the threshold, and measuring the difference between the threshold fall time and the signal output time as change in the gas concentration.

摘要翻译： 气体浓度测量仪器包括：超声波发射装置，用于根据由一组矩形脉冲波组成的超声波发生信号发送超声波; 超声波接收装置，用于将通过测量区域中的气体传输的超声波转换为电信号，以将其用作超声波接收信号; 以及气体浓度测量装置，用于在输出超声波产生信号时测量信号输出时间，通过对超声波接收信号进行包络提取处理产生包络处理信号，该包络提取处理测量包络处理信号下降时的阈值下降时间 超过阈值之后的预定阈值，并且测量阈值下降时间和信号输出时间之间的差作为气体浓度的变化。

公开(公告)号：US20050235734A1

公开(公告)日：2005-10-27

申请号：US10521746

申请日：2003-07-18

申请人： Tatsu Kobayakawa ,  Hideki Toda ,  Sachiko Saito

发明人： Tatsu Kobayakawa ,  Hideki Toda ,  Sachiko Saito

IPC分类号： G01N29/02 ,  G01N29/00 ,  G01N29/032 ,  G01N29/40 ,  G01N29/44 ,  G01N29/48

CPC分类号： G01N29/40 ,  G01N29/032 ,  G01N29/343 ,  G01N29/48 ,  G01N2291/0212 ,  G01N2291/02809 ,  G01N2291/02818 ,  G01N2291/02836

摘要： A gas concentration measurement instrument comprises: ultrasonic wave transmitting means for transmitting an ultrasonic wave according to an ultrasonic wave generation signal composed of a group of rectangular pulse waves; ultrasonic wave receiving means for converting the ultrasonic wave transmitted through the gas in the measurement region into an electric signal to use it as an ultrasonic wave reception signal; and gas concentration measuring means for measuring the signal output time when the ultrasonic wave generation signal is outputted, generating an envelope processing signal by subjecting the ultrasonic wave reception signal to an envelope extracting processing, measuring the threshold fall time when the envelope processing signal decreases below a predetermined threshold after exceeding the threshold, and measuring the difference between the threshold fall time and the signal output time as change in the gas concentration.

摘要翻译： 气体浓度测量仪器包括：超声波发射装置，用于根据由一组矩形脉冲波组成的超声波发生信号发送超声波; 超声波接收装置，用于将通过测量区域中的气体传输的超声波转换为电信号，以将其用作超声波接收信号; 以及气体浓度测量装置，用于在输出超声波产生信号时测量信号输出时间，通过对超声波接收信号进行包络提取处理产生包络处理信号，该包络提取处理测量包络处理信号下降时的阈值下降时间 超过阈值之后的预定阈值，并且测量阈值下降时间和信号输出时间之间的差作为气体浓度的变化。