Abstract: An aspirated smoke detector includes at least one ambient atmosphere inflow collection pipe with a plurality of inflow ports arranged along the pipe. The ports of the pipe are defined at least in part by temperature sensitive materials which alter the area of the respective inflow port in response to physical and/or chemical changes. As the temperature increases the area increases, thereby drawing more of the local ambient air and airborne particulate matter into the flow pipe, and then onto the smoke sensing chamber. This increased flow off-sets the dilution present due to other air in the respective pipe from other inflow ports which might not be near the developing fire condition.

Abstract: A multi-frequency photoelectric smoke detector includes a multi-frequency, source and an multi-frequency sensing array. The array can be part of a solid state camera which can be used to sense scattered multi-frequency light. Multiple wavelength signals, red, blue green for example, emitted by the camera can be analyzed to determine a degree of airborne particulate matter in a sensing region between the source and the array.

Abstract: A detector of human emitted Blackbody radiation includes a plurality of series connected thermocouples. A lens can be associated with each of the thermocouples. Incoming radiation produces a different response in each of the thermocouples in accordance with a respective angle of arrival even from a motionless radiation source.

Abstract: An aspirated smoke detector includes at least one ambient atmosphere inflow collection pipe with a plurality of inflow ports arranged along the pipe. The ports of the pipe are defined at least in part by temperature sensitive materials which alter the area of the respective inflow port in response to physical and/or chemical changes. As the temperature increases the area increases, thereby drawing more of the local ambient air and airborne particulate matter into the flow pipe, and then onto the smoke sensing chamber. This increased flow off-sets the dilution present due to other air in the respective pipe from other inflow ports which might not be near the developing fire condition.

Abstract: A mounting apparatus usable with ambient condition detectors includes first and second mounting bases spaced apart axially along a common center line. Respective detectors can be coupled to the bases as required in a specific installation.

Abstract: A detector of human emitted Blackbody radiation includes a plurality of series connected thermocouples. A lens can be associated with each of the thermocouples. Incoming radiation produces a different response in each of the thermocouples in accordance with a respective angle of arrival even from a motionless radiation source.

Abstract: A multi-frequency photoelectric smoke detector includes a multi-frequency, source and an multi-frequency sensing array. The array can be part of a solid state camera which can be used to sense scattered multi-frequency light. Multiple wavelength signals, red, blue green for example, emitted by the camera can be analyzed to determine a degree of airborne particulate matter in a sensing region between the source and the array.

Abstract: An aspirated smoke detector includes a flow path and a generator of acoustic waves in the flow path. Airborne particulate matter in the flow path responds to the acoustic field by particle agglomeration; the resulting larger particles flow into a photoelectric-type smoke sensor. A sensed level of particles can be processed, or compared to one or more predetermined thresholds to establish presence of one or more predetermined conditions.

Abstract: Evacuation route signs can be mounted on smoke or fire detectors as well as manually operable alarm units. The signs can be oriented in one of a plurality of exit route indicating positions and can be illuminated in response to an alarm condition.

Abstract: A mounting apparatus usable with ambient condition detectors includes first and second mounting bases spaced apart axially along a common center line. Respective detectors can be coupled to the bases as required in a specific installation.