System and method for high-sensitivity sensor

摘要

A sensor unit that includes at least one sensor configured to measure an ambient condition is described. The controller can be configured to receive instructions, to report a notice level when the controller determines that data measured by the at least one sensor fails a report threshold test corresponding to a report threshold value. The controller can also be configured to obtain a plurality of calibration measurements from the at least one sensor during a calibration period and to adjust the threshold based on the calibration measurements. The controller can be configured to compute a first threshold level corresponding to background noise and a second threshold level corresponding to sensor noise, and to compute the report threshold value from the second threshold. In one embodiment, the sensor unit adjusts one or more of the thresholds based on ambient temperature.

主权项

1. A device, comprising:
a housing; a smoke chamber arranged within the housing and configured to receive air from outside of the housing of the device; an emitter arranged within the housing and configured to emit electromagnetic radiation into the smoke chamber; a sensor arranged within the housing and configured to:
measure a scattered portion of the electromagnetic radiation emitted by the emitter into the smoke chamber, the measurement of the scattered portion of the electromagnetic radiation being dependent on an ambient temperature of the device, the ambient temperature being a temperature within the housing of the device; andmeasure a second portion of electromagnetic radiation in the smoke chamber, wherein electromagnetic radiation is not emitted by the emitter into the smoke chamber when the second portion is measured; a temperature sensor arranged within the housing and configured to measure the ambient temperature of the device; and a temperature compensation element configured to correct a measurement measured by the sensor based on the ambient temperature measured by the temperature sensor, said correcting at least partially offsetting a change in the measurement measured by the sensor caused by a change in the ambient temperature of the device.