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    • 1. 发明申请
    • APPARATUS AND METHOD FOR GENERATING LIGHT PULSES FROM LEDS IN OPTICAL ABSORPTION GAS SENSORS
    • 用于在光吸收式气体传感器中产生LED的光脉冲的装置和方法
    • WO2012059744A1
    • 2012-05-10
    • PCT/GB2011/052111
    • 2011-10-28
    • GAS SENSING SOLUTIONS LTD.MACGREGOR, Calum JohnGIBSON, Desmond Robert
    • MACGREGOR, Calum JohnGIBSON, Desmond Robert
    • G01N21/35G01N21/27
    • G01N21/61G01J11/00G01N21/274G01N21/3504G01N2201/0696G01N2201/1211G01N2201/127
    • An optical absorption gas sensor for detecting an analyte gas comprises a gas sample receiving chamber, at least one light emitting diode (LED) and a photodiode or other photosensor. A plurality of light pulses are generated by passing pulses of current through the at least one LED. The current through the at least one LED is measured a plurality of times during each pulse and taken into account when generating a compensated output signal. The transfer ratio between LED current and photodiode output signal is calculated a plurality of times during each pulse. An ADC measures the LED and photodiode currents alternately. The LED pulses are generated by inductor discharge flyback and the period of time for which current is supplied to the inductor prior to each pulse is selected so that the photodiode output current is at an optimal region within the input range of the ADC. At least the temperature of the at least one LED is measured and taken into account when generating the compensated output signal. Thus, rather than providing especially careful control of the LED pulses, the pulses are measured, enabling a simpler, lower power circuit which is tolerant of variations in temperature to be provided.
    • 用于检测分析气体的光吸收气体传感器包括气体样品接收室,至少一个发光二极管(LED)和光电二极管或其它光电传感器。 通过使电流的脉冲通过至少一个LED来产生多个光脉冲。 通过至少一个LED的电流在每个脉冲期间被测量多次,并且在产生补偿的输出信号时被考虑。 在每个脉冲期间多次计算LED电流和光电二极管输出信号之间的传输比。 ADC交替测量LED和光电二极管电流。 LED脉冲由电感放电回扫产生,并且选择在每个脉冲之前向电感器提供电流的时间段,使得光电二极管输出电流处于ADC的输入范围内的最佳区域。 当产生补偿的输出信号时,至少测量并考虑至少一个LED的温度。 因此,不是特别仔细地控制LED脉冲,而是测量脉冲,使得能够提供容忍温度变化的更简单的较低功率电路。
    • 2. 发明申请
    • TEMPERATURE CALIBRATION METHODS AND APPARATUS FOR OPTICAL ABSORPTION GAS SENSORS, AND OPTICAL ABSORPTION GAS SENSORS THEREBY CALIBRATED
    • 用于光吸收气体传感器的温度校准方法和装置,以及被校准的光吸收式气体传感器
    • WO2012059743A2
    • 2012-05-10
    • PCT/GB2011/052110
    • 2011-10-28
    • GAS SENSING SOLUTIONS LTD.MACGREGOR, Calum JohnGIBSON, Desmond Robert
    • MACGREGOR, Calum JohnGIBSON, Desmond Robert
    • G01N21/35G01N21/27G01N33/00
    • G01N21/27G01N21/274G01N21/3504G01N33/0006G01N2201/1211G01N2201/12723G01N2201/12753G01N2201/12792
    • An optical absorption gas sensor has an LED light source and a photodiode light detector, a temperature measuring device for measuring the LED temperature and a temperature measuring device for measuring the photodiode temperature. The sensor is calibrated by measuring the response of photodiode current at zero analyte gas concentration and at a reference analyte gas concentration. From these measurement, calibration data taking into account the effect of photodiode temperature on the sensitivity of the photodiode and, independently, the effect of changes in the spectrum of light output by the LED on the light detected by the photodiode with LED temperature can be obtained. Calibration data is written to memory in the gas sensor and in operation of the gas sensor, the output is compensated for both LED and photodiode temperature. The LED and photodiode can therefore be relatively far apart and operate at significantly different temperatures allowing greater freedom of optical pathway design. There is also disclosed an elongate waveguide for an optical absorption gas sensor formed from two opposed compound parabolic collectors.
    • 光吸收式气体传感器具有LED光源和光电二极管光检测器,用于测量LED温度的温度测量装置和用于测量光电二极管温度的温度测量装置。 通过测量零分析气体浓度和参考分析物气体浓度下的光电二极管电流的响应来校准传感器。 从这些测量中,考虑到光电二极管温度对光敏二极管的影响的影响的校准数据,并且独立地,可以获得由LED输出的光谱的变化对由LED温度的光电二极管检测到的光的影响 。 校准数据被写入气体传感器中的存储器,并且在气体传感器的操作中,输出被补偿LED和光电二极管的温度。 因此,LED和光电二极管可以相对较远并且在显着不同的温度下操作,从而允许更大的光路设计自由度。 还公开了一种用于由两个相对的复合抛物线收集器形成的光吸收气体传感器的细长波导。
    • 5. 发明申请
    • GAS SENSOR WITH RADIATION GUIDE
    • 气体传感器与辐射指南
    • WO2011086394A1
    • 2011-07-21
    • PCT/GB2011/050077
    • 2011-01-18
    • GAS SENSING SOLUTIONS LTD.GIBSON, Desmond, RobertMACGREGOR, Calum, JohnWADDELL, Ewan, MacKinnon
    • GIBSON, Desmond, RobertMACGREGOR, Calum, JohnWADDELL, Ewan, MacKinnon
    • G01N21/35G01N21/03
    • G01N21/3504G01N21/031G01N2201/0636Y10T156/10
    • An optical absorption gas sensor includes a radiation source, detector and a radiation guide. The radiation source and detector are close together and in thermal communication. The radiation guide has a rectangular cross section and curves in a first sense, around an axis parallel to the major dimension of the rectangular cross section, and then in a second opposite sense, and again in the first sense. A relatively long path for radiation is provided in a compact device, without the attenuation of radiation which would occur if the radiation guide did not have a rectangular cross section and curved only around an axis parallel to the major dimension of the rectangular cross section. A reference measurement can be obtained by mounting a reference radiation source behind a translucent measurement radiation source and directing radiation from the reference radiation source through the measurement radiation source. Radiation from a reference radiation source may be directed around the measurement reference source. Measurement and reference signals can be obtained by using a light emitting diode to generate radiation which is detected by a photodiode, in a first operating mode, and driving the photodiode to generate radiation having a different emission spectrum while detecting the resulting radiation using the light emitting diode, in a second operating mode. An optical absorption gas sensor may be manufactured by abutting two or more L- shaped radiation guide portions to form a radiation guide. The radiation guide has an interior surface operable to reflect radiation emitted by the radiation source of the optical absorption gas sensor.
    • 光吸收气体传感器包括辐射源,检测器和辐射引导件。 辐射源和检测器靠近在一起并在热通信。 辐射引导件具有矩形横截面,并且在第一意义上围绕平行于矩形横截面的主要尺寸的轴线弯曲,然后以第二相反的意义,并且再次以第一意义弯曲。 在紧凑的装置中提供了相对较长的辐射路径,而不会导致辐射的衰减,如果辐射导向器没有矩形横截面并且仅在平行于矩形横截面的主要尺寸的轴线上弯曲。 可以通过将参考辐射源安装在半透明测量辐射源之后并且将来自参考辐射源的辐射引导通过测量辐射源来获得参考测量。 来自参考辐射源的辐射可以围绕测量参考源引导。 测量和参考信号可以通过使用发光二极管在第一操作模式中产生由光电二极管检测到的辐射并且驱动光电二极管以产生具有不同发射光谱的辐射,同时使用发光 二极管,处于第二工作模式。 光吸收气体传感器可以通过邻接两个或更多个L形辐射引导部分来形成辐射导向器来制造。 辐射引导件具有可操作以反射由光吸收气体传感器的辐射源发射的辐射的内表面。