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Photoelectric smoke detector ambient light suppression method and system

A smoke detector and ambient light technology, applied in the field of smoke detectors, to achieve the effect of strong suppression ability, low power consumption, excellent static and dynamic ambient light suppression ability

Active Publication Date: 2020-04-03
BEIJING SENSORO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the shortcomings of the ambient light suppression scheme in the prior art, the present invention provides a photoelectric smoke detector ambient light suppression method and system, which can still provide excellent static light while avoiding the use of complex digital logic or digital operations. and dynamic ambient light suppression capability

Method used

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  • Photoelectric smoke detector ambient light suppression method and system
  • Photoelectric smoke detector ambient light suppression method and system
  • Photoelectric smoke detector ambient light suppression method and system

Examples

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Embodiment 1

[0050] Such as figure 1 As shown, a method for suppressing ambient light of a photoelectric smoke detector disclosed in this embodiment includes the following steps:

[0051] S1. When the detector needs to be detected, the light-emitting diode D1 emits light;

[0052] S2. receiving the light emitted by the light-emitting diode D1 and scattered by the smoke particles;

[0053] S3. Extract the rising edge signal generated at the instant when the light-emitting diode D1 is turned on, and output the extracted signal;

[0054] S4. Maintain the peak value in the belt output signal;

[0055] S5. The detector performs sampling and completes digital-to-analog conversion during the peak maintenance process.

[0056] The light-emitting diode D1 is driven by the light-emitting diode driving circuit to emit light; the light emitted by the light-emitting diode D1 is received by the photoreceiving diode D2; the light receiving diode D2 receives the light emitted by the light-emitting diod...

Embodiment 2

[0064] Such as figure 2 , image 3 and Figure 4 As shown, this embodiment discloses a photoelectric smoke detector ambient light suppression system, the system includes:

[0065] The driving module 10 is used to drive the light-emitting diode D1 to emit light when the detector needs to be detected;

[0066] The receiving module 20 is used to receive the light emitted by the light emitting diode D1 and scattered by the smoke particles;

[0067] The extraction module 30 is used to extract the rising edge signal generated at the moment when the light-emitting diode D1 is turned on, and output the extracted signal;

[0068] A maintenance module 40, configured to maintain the peak value in the band output signal;

[0069] The sampling module 50 is used for the detector to sample and complete the digital-to-analog conversion during the peak maintenance process;

[0070] The clearing module 60 is used for clearing the peak value in the circuit before the light-emitting diode e...

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Abstract

The invention relates to the technical field of smoke detectors, in particular to a photoelectric smoke detector ambient light suppression method and a system. The method comprises the following steps: when a detector needs to perform detection, emitting light by a light emitting diode D1; receiving light emitted by the light emitting diode D1 and scattered by the smoke particles; extracting a rising edge signal generated at the moment when the light emitting diode D1 is turned on, and outputting the extracted signal; maintaining a peak value in the band output signal; and the detector performs sampling and completes digital-to-analog conversion in the peak value maintaining process. The method can be used in a point-type light scattering smoke detector without an optical maze, and can still provide excellent static and dynamic ambient light suppression capability under the condition of avoiding the use of complex digital logic or digital operation. And a practical and feasible solution is provided for the low-cost and low-power-consumption non-optical maze point type light scattering smoke detector.

Description

technical field [0001] The invention relates to the technical field of smoke detectors, in particular to a method and system for suppressing ambient light of a photoelectric smoke detector. Background technique [0002] In the photoelectric smoke detector, the structure of the maze and the design of the optical path are usually used to reduce the influence of ambient light on the receiving tube. The elimination of ambient light through the design of the maze increases the complexity of the design on the one hand; on the other hand, it also prevents smoke particles from entering the detection area, reducing detection sensitivity and increasing response time. [0003] Patent CN104200606 discloses a signal processing method for solving ambient light interference in a point-type light-scattering smoke detector without an optical labyrinth. In this method, the emission tube is used to modulate the scattering signal, and then demodulated to obtain the smoke concentration signal t...

Claims

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Application Information

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IPC IPC(8): G08B17/103G08B17/107
CPCG08B17/103G08B17/107
Inventor 张宁
Owner BEIJING SENSORO