公开(公告)号：US5841017A

公开(公告)日：1998-11-24

申请号：US828837

申请日：1997-03-24

申请人： Mourad Baraket ,  Mauro Feltre ,  Martin Forster ,  Rene Lenggenhager ,  Andreas Portmann ,  Georges Tenchio

发明人： Mourad Baraket ,  Mauro Feltre ,  Martin Forster ,  Rene Lenggenhager ,  Andreas Portmann ,  Georges Tenchio

IPC分类号： G01N21/17 ,  G01L27/00

CPC分类号： G01N21/1702

摘要： In a photo-acoustic gas sensor having a measuring cell, a lamp, a photo-diode, a gas-permeable diaphragm and a microphone, a device is included for monitoring the gas-permeable diaphragm and the microphone. The device is operated in an explosion-proof manner. Intentionally, for diagnostic purposes, an artificial pressure modulation is generated in the measuring cell. The pressure modulation is converted by the microphone into electrical monitoring signals which are amplified by an amplifier circuit and assigned to preset ranges by a microprocessor, for determining the functional condition of the diaphragm and the microphone, and of microphone sensitivity. Depending on the range assigned to the monitoring signal, an output signal is generated indicating a fault in the microphone and/or the diaphragm. In the event of long-term drift in microphone sensitivity, a calibration is performed in which gas concentration values are re-calculated and stored in an EEPROM. A heater wire can be used, for modulated heating to generate the pressure modulation.

摘要翻译： 在具有测量单元，灯，光电二极管，透气隔膜和麦克风的光声气体传感器中，包括用于监测透气隔膜和麦克风的装置。 该设备以防爆方式运行。 故意地，为了诊断目的，在测量单元中产生人工压力调制。 压力调制由麦克风转换为由放大器电路放大并由微处理器分配给预设范围的电监控信号，用于确定隔膜和麦克风的功能状况以及麦克风灵敏度。 根据分配给监控信号的范围，产生指示麦克风和/或隔膜故障的输出信号。 在麦克风灵敏度长期漂移的情况下，执行校准，其中将气体浓度值重新计算并存储在EEPROM中。 可以使用加热器线，用于调制加热以产生压力调制。

公开(公告)号：US20060254340A1

公开(公告)日：2006-11-16

申请号：US11130316

申请日：2005-05-16

申请人： Mourad Baraket ,  Urs Gerber ,  Olivier Ruffiner ,  Mauro Feltre

发明人： Mourad Baraket ,  Urs Gerber ,  Olivier Ruffiner ,  Mauro Feltre

IPC分类号： G01N7/00 ,  G01N29/02

CPC分类号： G01N7/00 ,  G01N21/1702 ,  G01N29/032 ,  G01N29/2425 ,  G01N2021/1704 ,  G01N2291/0215 ,  G01N2291/02872

摘要： An optoacoustic sensor for detecting one or more target gases includes a body featuring halves containing measurement cells. Each measurement cell is in communication with a light source and a microphone as well as the ambient atmosphere. Evaluation and control electronics are in communication with the light sources and the microphones sequentially illuminate the first and second light sources so that a measurement signal due to optoacoustic pressure variations from a target gas is generated by the microphone of the illuminated or gas active cell and a compensation signal is generated by the microphone of the non-illuminated or gas inactive cell. The compensation signal is subtracted from the measurement signal by the evaluation and control electronics to provide a sensor output signal.

摘要翻译： 用于检测一个或多个目标气体的光声传感器包括具有包含测量单元的半部的主体。 每个测量单元与光源和麦克风以及周围环境通信。 评估和控制电子设备与光源通信，并且麦克风顺序地照亮第一和第二光源，使得由于来自目标气体的光声压力变化引起的测量信号由照明或气体活性电池的麦克风产生，并且 补偿信号由非照明或气体不活动单元的麦克风产生。 通过评估和控制电子装置从测量信号中减去补偿信号，以提供传感器输出信号。

公开(公告)号：US07213444B2

公开(公告)日：2007-05-08

申请号：US11130316

申请日：2005-05-16

申请人： Mourad Baraket ,  Urs Gerber ,  Olivier Ruffiner ,  Mauro Feltre

发明人： Mourad Baraket ,  Urs Gerber ,  Olivier Ruffiner ,  Mauro Feltre

IPC分类号： G01N21/00

CPC分类号： G01N7/00 ,  G01N21/1702 ,  G01N29/032 ,  G01N29/2425 ,  G01N2021/1704 ,  G01N2291/0215 ,  G01N2291/02872

摘要： An optoacoustic sensor for detecting one or more target gases includes a body featuring halves containing measurement cells. Each measurement cell is in communication with a light source and a microphone as well as the ambient atmosphere. Evaluation and control electronics are in communication with the light sources and the microphones sequentially illuminate the first and second light sources so that a measurement signal due to optoacoustic pressure variations from a target gas is generated by the microphone of the illuminated or gas active cell and a compensation signal is generated by the microphone of the non-illuminated or gas inactive cell. The compensation signal is subtracted from the measurement signal by the evaluation and control electronics to provide a sensor output signal.

摘要翻译： 用于检测一个或多个目标气体的光声传感器包括具有包含测量单元的半部的主体。 每个测量单元与光源和麦克风以及周围环境通信。 评估和控制电子设备与光源通信，并且麦克风顺序地照亮第一和第二光源，使得由于来自目标气体的光声压力变化引起的测量信号由照明或气体活性电池的麦克风产生，并且 补偿信号由非照明或气体不活动单元的麦克风产生。 通过评估和控制电子装置从测量信号中减去补偿信号，以提供传感器输出信号。

公开(公告)号：US5753797A

公开(公告)日：1998-05-19

申请号：US706240

申请日：1996-09-04

申请人： Martin Forster ,  Rolf Pleisch ,  Mourad Baraket

发明人： Martin Forster ,  Rolf Pleisch ,  Mourad Baraket

IPC分类号： G01N29/00 ,  G01N21/00 ,  G01N21/17 ,  G01N29/02

CPC分类号： G01N21/1702 ,  G01N2291/02809 ,  G01N2291/02872

摘要： A photo-acoustic gas sensor for measuring a gas concentration, e.g., of an explosive gas, consists of a cylindrical sensor body (1) which includes a cylindrical measurement chamber (13) whose longitudinal axis extends perpendicular to the longitudinal axis of the cylindrical sensor body. Without changing the outer dimensions of the sensor body, the length of the measurement chamber can be changed in accordance with a desired measurement sensitivity and a desired measurement range. A light source (5) is disposed such that it irradiates the measurement chamber without irradiating a gas-permeable membrane (2), so that the membrane will not produce an interference signal. The gas sensor is rendered explosion-proof as the light source and a photo-diode (6) which monitors the light source are tightly sealed from the environment. Proper functioning of a microphone (4), the light source and the photo-diode are monitored by analyzing a background signal.

摘要翻译： 用于测量例如爆炸性气体的气体浓度的光声气体传感器由圆柱形传感器主体（1）组成，该圆柱形传感器主体（1）包括圆柱形测量室（13），该圆柱形测量室的纵向轴线垂直于圆柱形传感器 身体。 不改变传感器主体的外部尺寸，可以根据期望的测量灵敏度和期望的测量范围来改变测量室的长度。 光源（5）被布置成使得它不照射透气膜（2）照射测量室，使得膜不会产生干涉信号。 气体传感器作为光源被防爆，并且监测光源的光电二极管（6）与环境密封。 通过分析背景信号来监测麦克风（4），光源和光电二极管的正常功能。