Various apparatus and methods for smoke detection are disclosed. In one embodiment, a method of training a classifier for a smoke detector comprises inputting sensor data from a plurality of tests into a processor. The sensor data is processed to generate derived signal data corresponding to the test data for respective tests. The derived signal data is assigned into categories comprising at least one fire group and at least one non-fire group. Linear discriminant analysis (LDA) training is performed by the processor. The derived signal data and the assigned categories for the derived signal data are inputs to the LDA training. The output of the LDA training is stored in a computer readable medium, such as in a smoke detector that uses LDA to determine, based on the training, whether present conditions indicate the existence of a fire.

Various apparatus and methods for smoke detection are disclosed. In one embodiment, a method of training a classifier for a smoke detector comprises inputting sensor data from a plurality of tests into a processor. The sensor data is processed to generate derived signal data corresponding to the test data for respective tests. The derived signal data is assigned into categories comprising at least one fire group and at least one non-fire group. Linear discriminant analysis (LDA) training is performed by the processor. The derived signal data and the assigned categories for the derived signal data are inputs to the LDA training. The output of the LDA training is stored in a computer readable medium, such as in a smoke detector that uses LDA to determine, based on the training, whether present conditions indicate the existence of a fire.

A device for detecting a concentration of tiny particulates in an air sample is provided. The device comprises: a container that contains the air sample and has an opening; a sealing mechanism that opens or seals the opening; a sensor provided in the container and operative to sense a total concentration of particulates in the air sample within the container; and a controller connected to the sensor and operative to control the sealing mechanism. The controller is configured to: control the sealing mechanism to open the opening and the sensor to sense a first total concentration of particulates; control the sealing mechanism to seal the opening, so as to seal the container for a predetermined time period, and then control the sensor to sense a second total concentration of particulates; calculate a ratio of a concentration of tiny particulates to a total concentration of particulates based on a predetermined relationship between the ratio of the concentration of tiny particulates to the total concentration of particulates and a ratio of the second total concentration of particulates to the first total concentration of particulates; and calculate the concentration of tiny particulates in the air sample based on the first total concentration of particulates and the ratio of the concentration of tiny particulates to the total concentration of particulates.

A point detector (1) for a fire alarm system. The point detector (1) includes a fan (2) configured to aspirate air from a surrounding environment; and an inlet (3) in flow communication with the fan (2); the inlet (3) is configured to split the incoming flow into multiple streams (4); and each stream (4) of the multiple streams (4) is configured to be in flow communication with a respective sensing device (6).

A point detector (1) for a fire alarm system. The point detector (1) includes a fan (2) configured to aspirate air from a surrounding environment; and an inlet (3) in flow communication with the fan (2); the inlet (3) is configured to split the incoming flow into multiple streams (4); and each stream (4) of the multiple streams (4) is configured to be in flow communication with a respective sensing device (6).

A smoke detector comprising an enclosure communicating with an external environment, within the enclosure a light source illuminating a detection volume in a first wavelength band and a light-sensor responding to light from the sensing volume in a second wavelength band. The detector is configured to sense photo-luminescent fire products, particularly polyaromatic compounds, and actuate an alarm when signal levels indicate a dangerous/fire condition is present. The photo-luminescence detector may be combined with optical scatter or other fire detectors to improve discrimination between fires and false alarm sources.

A smoke detector comprising an enclosure communicating with an external environment, within the enclosure a light source illuminating a detection volume in a first wavelength band and a light-sensor responding to light from the sensing volume in a second wavelength band. The detector is configured to sense photo-luminescent fire products, particularly polyaromatic compounds, and actuate an alarm when signal levels indicate a dangerous/fire condition is present. The photo-luminescence detector may be combined with optical scatter or other fire detectors to improve discrimination between fires and false alarm sources.

A communication electronics module is provided having a casing like a conventional battery and includes terminals which enable the module to fit into a battery socket. The module may also be incorporated into a single-cell battery or a multiple-cell battery pack. The module communicates with both the battery, the electronic device powered by the battery and other remote electronics devices.

A communication electronics module is provided having a casing like a conventional battery and includes terminals which enable the module to fit into a battery socket. The module may also be incorporated into a single-cell battery or a multiple-cell battery pack. The module communicates with both the battery, the electronic device powered by the battery and other remote electronics devices.

An optical detector device may receive a spectroscopic measurement from a multispectral sensor. The optical detector device may determine, based on the spectroscopic measurement, a particulate size of a particulate. The optical detector device may determine, based on the spectroscopic measurement, an identification of the particulate. The optical detector device may determine, based on the particulate size and the identification of the particulate, that an alert condition is satisfied. The optical detector device may trigger an alert based on determining that the alert condition is satisfied.