Abstract: An ultrasonic gas leak detector system for locating a source of ultrasonic airborne energy is described. An exemplary embodiment includes a plurality of spatially separated ultrasonic gas leak detectors, each configured to generate signals indicative of detected angles of arrival of received ultrasonic energy at the respective detectors. A locator processor receives the signals generated by the detectors, and is configured to process the signals to determine a location in three dimensions of the source of the ultrasonic energy received at the detectors and provide locator processor output signals indicative of the location.

Abstract: An ultrasonic gas leak detector system for locating a source of ultrasonic airborne energy is described. An exemplary embodiment includes a plurality of spatially separated ultrasonic gas leak detectors, each configured to generate signals indicative of detected angles of arrival of received ultrasonic energy at the respective detectors.

Abstract: An embodiment of a directional ultrasonic gas leak detector includes an array of spaced MEMS microphones, each responsive to incident airborne ultrasonic energy from gas leak sources to generate a microphone signal. A beamforming processor is responsive to the microphone signals from the array to generate processor output signals indicative of estimated angles of arrival of ultrasonic energy incident on the array. The array may be disposed in an explosion proof housing structure for operation in hazardous location, or implemented as an intrinsically safe device. In another embodiment, a display is responsive to the processor output signals to generate an image representative of a surveilled scene with the estimated magnitudes of incident energy at beam directions overlaid onto the image.

Abstract: Exemplary embodiments of a flame detector and operating method. Optical energy is received at one or more optical sensors, and the detector processes the energy to determine whether the received energy is from a known remote test source. If so, the flame detector is operated in a test mode. If the processing indicates that the received optical energy is not a test signal, the flame detector is operated in a flame detection operating mode. The detector processing uses an artificial neural network in an exemplary embodiment in the flame detection operation mode.

Abstract: An embodiment of a directional ultrasonic gas leak detector includes an array of spaced MEMS microphones, each responsive to incident airborne ultrasonic energy from gas leak sources to generate a microphone signal. A beamforming processor is responsive to the microphone signals from the array to generate processor output signals indicative of estimated angles of arrival of ultrasonic energy incident on the array. The array may be disposed in an explosion proof housing structure for operation in hazardous location, or implemented as an intrinsically safe device. In another embodiment, a display is responsive to the processor output signals to generate an image representative of a surveilled scene with the estimated magnitudes of incident energy at beam directions overlaid onto the image.

Abstract: An ultrasonic gas leak detector is configured to discriminate the ultrasound generated by a pressurized gas leak into the atmosphere from false alarm ultrasound. An exemplary embodiment includes a sensor for detecting ultrasonic energy and providing sensor signals, and an electronic controller responsive to the sensor signals. In one exemplary embodiment, the electronic controller is configured to provide a threshold comparator function to compare a sensor signal value representative of sensed ultrasonic energy to a gas detection threshold value, and an Artificial Neural Network (ANN) function for processing signals derived from the digital sensor signals and applying ANN coefficients configured to discriminate false alarm sources from gas leaks. An output function generates detector outputs in dependence on the threshold comparator output and the ANN output.

Abstract: An ultrasonic gas leak detector is configured to discriminate the ultrasound generated by a pressurized gas leak into the atmosphere from false alarm ultrasound. An exemplary embodiment includes a sensor for detecting ultrasonic energy and providing sensor signals, and an electronic controller responsive to the sensor signals. In one exemplary embodiment, the electronic controller is configured to provide a threshold comparator function to compare a sensor signal value representative of sensed ultrasonic energy to a gas detection threshold value, and an Artificial Neural Network (ANN) function for processing signals derived from the digital sensor signals and applying ANN coefficients configured to discriminate false alarm sources from gas leaks. An output function generates detector outputs in dependence on the threshold comparator output and the ANN output.

Abstract: A flame detection system includes a plurality of sensors for generating a plurality of respective sensor signals. The plurality of sensors includes a set of discrete optical radiation sensors responsive to flame as well as non-flame emissions. An Artificial Neural Network may be applied in processing the sensor signals to provide an output corresponding to a flame condition.