SMOKE DETECTOR AND METHOD FOR DETERMINING FAILURE THEREOF

    公开(公告)号:US20180211514A1

    公开(公告)日:2018-07-26

    申请号:US15416837

    申请日:2017-01-26

    Applicant: Google LLC

    CPC classification number: G08B29/145

    Abstract: A smoke detector includes an illuminator, a light sensor, a memory, and a microprocessor. The illuminator is configured to emit a first electromagnetic signal having a first center wavelength and a second electromagnetic signal having a second center wavelength. The light sensor is configured to generate (a) a first clean-air voltage in response to receiving the first electromagnetic signal and (b) a second clean-air voltage in response to receiving the second electromagnetic signal. The memory stores non-transitory computer-readable instructions. The microprocessor is adapted to execute the instructions to: (i) determine a first signal drift value from the first clean-air voltage and a first reference voltage, (ii) determine a second signal drift value from the second clean-air voltage and a second reference voltage, and (iii) determine the operational state from both the first signal drift value and the second signal drift value.

    Smoke detector and method for determining failure thereof

    公开(公告)号:US10339794B2

    公开(公告)日:2019-07-02

    申请号:US15416837

    申请日:2017-01-26

    Applicant: Google LLC

    Abstract: A smoke detector includes an illuminator, a light sensor, a memory, and a microprocessor. The illuminator is configured to emit a first electromagnetic signal having a first center wavelength and a second electromagnetic signal having a second center wavelength. The light sensor is configured to generate (a) a first clean-air voltage in response to receiving the first electromagnetic signal and (b) a second clean-air voltage in response to receiving the second electromagnetic signal. The memory stores non-transitory computer-readable instructions. The microprocessor is adapted to execute the instructions to: (i) determine a first signal drift value from the first clean-air voltage and a first reference voltage, (ii) determine a second signal drift value from the second clean-air voltage and a second reference voltage, and (iii) determine the operational state from both the first signal drift value and the second signal drift value.

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