Optical receiving module of high-sensitivity fire smoke alarm

A smoke alarm and optical receiving technology, which is applied in fire alarms, alarms, and material analysis through optical means, can solve the problems of low sensitivity of electrical signals and difficulty in the application of high-sensitivity smoke fire detectors, etc. Achieve the effects of improved detection ability, anti-interference ability of external environment, and high sensitivity

Active Publication Date: 2014-07-02
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

Due to the small light-receiving area of ​​the photodiode, the sensitivity of converting light into electrical signals is low

Method used

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  • Optical receiving module of high-sensitivity fire smoke alarm
  • Optical receiving module of high-sensitivity fire smoke alarm

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Embodiment 1

[0016] The high-sensitivity smoke fire detector requires that it can detect the weak light scattered by smoke particles under the condition of relatively sparse smoke concentration (smoke concentration is above 96% / ft). Silicon photocells with large receiving area. According to the research in this paper, silicon photovoltaic cells can be used as a constant current source when the external load is small (the load is less than 10k), and the received light intensity and current have a linear growth relationship. The invention selects a suitable load and circuit, converts the silicon photocell constant current source circuit into a voltage value, then further amplifies the voltage value, and finally converts the voltage value into a digital quantity by an AD acquisition circuit, which is convenient for subsequent analysis.

[0017] The detector light source used in this example is a 1ms pulse light source emitted by a semiconductor laser tube with a wavelength of 850nm and a cont...

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Abstract

The invention provides an optical receiving module of a high-sensitivity fire smoke alarm. The optical receiving module comprises six parts, namely an optical filter, a silicon photocell, a current-voltage conversion circuit, a filter circuit, a voltage amplifier circuit and an overvoltage protection circuit. The silicon photocell with a large photosurface is used for receiving smoke particle scattered light. The resistance to ambient light is effectively enhanced through the narrow-band optical filter. According to a signal processing circuit, a two-stage operational amplifier, a plurality of resistors and capacitors are mainly used for forming the current-voltage conversion circuit of the silicon photocell, the first-order RC high-pass filter circuit, the voltage amplifier circuit and the overvoltage protection circuit in sequence. The optical receiving module has the advantages of being simple, high in sensitivity and resistant to external ambient interference.

Description

technical field [0001] The invention belongs to the field of fire detection, and in particular relates to an optical receiving component of a high-sensitivity fire smoke alarm. Background technique [0002] In the early stages of a fire, a certain amount of smoke will be produced in most cases. An open fire produces black smoke composed of incompletely burned particles, and a smoldering fire produces small droplets of gray smoke formed by pyrolysis of combustibles. Regardless of black smoke Whether it is gray smoke, it will absorb or scatter the light irradiated on it. According to the light intensity passing through the smoke path or the light intensity scattered by the smoke, the concentration of smoke can be judged, so as to determine whether a fire has occurred. The fire smoke alarm developed according to this principle has been widely used in the early detection of fire in various scenes. [0003] Most of the fire alarms on the market are infrared photodiodes that rece...

Claims

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Application Information

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IPC IPC(8): G08B17/107G01N21/01
Inventor 张和平杨慎林陆松付阳阳王洁刘长城胡洋
Owner UNIV OF SCI & TECH OF CHINA
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