Linear infrared beam smoke fire detector and detection method thereof

An infrared beam and smoke-sensing fire technology, which is applied in fire alarms, instruments, alarms, etc., can solve problems such as ambient light interference and small detection distance, and achieve good cost performance and good balanced sensitive response performance

Inactive Publication Date: 2010-10-20
SHENYANG FIRE RES INST OF THE MIN OF PUBLIC SECURITY
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Problems solved by technology

[0003] Aiming at the problems that the existing linear infrared beam smoke detectors are easily interfered by ambient light and the detection distance is small in the application of large public buildings in the past, the present invention provides a method that overcomes the interference of ambient light and will effectively detect Linear Infrared Beam Smoke Fire Detector with Widened Range of 1-200m and Its Detection Method

Method used

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  • Linear infrared beam smoke fire detector and detection method thereof
  • Linear infrared beam smoke fire detector and detection method thereof
  • Linear infrared beam smoke fire detector and detection method thereof

Examples

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Embodiment Construction

[0042] Such as figure 1 As shown, a linear infrared light beam smoke detector includes an infrared receiver 1 and an infrared emitter 2, the second pin and the third pin of the infrared receiver 1 are respectively connected to the 24V power line of the DC24V power supply, 0V The power line is connected, the first pin of the infrared receiver 1 is connected to the signal line S connected to the signal source; the fourth pin of the infrared receiver 1 is connected to the second pin of the infrared transmitter 2, and the infrared Pin 1 of Transmitter 2 is connected to the 0V power line.

[0043] Such as image 3 As shown, a 4-bit dial switch BK4 is provided in the luminous intensity control circuit inside the infrared emitter 2 . The specific connection relationship of the luminous intensity control circuit of the infrared emitter is as follows:

[0044] The control output port RC4 of the microcontroller U2 is connected to the base of the first triode T1 through the sixth resi...

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Abstract

The invention discloses a linear infrared beam smoke fire detector and a detection method thereof, and belongs to the technical field of fire detection. The detector of the invention comprises an infrared receiver and an infrared transmitter, and the luminous control signal output end of the infrared receiver is connected with the signal receiving end of the infrared transmitter by using a lead so that the luminous state of the infrared transmitter is controlled by the infrared receiver to realize synchronous infrared beam transmitting / receiving of the linear infrared beam smoke fire detector. The detection method for the detector comprises the following steps of: operating a 4bit dial switch on the transmitter on site, and setting the detectable distance of the detector; transmitting luminous communication command to the transmitter by the receiver, emitting light for 0.1mS by the transmitter, and synchronously acquiring a current light intensity comprehensive value by the receiver; obtaining a current smoke detection value by adopting a light interference removing method; and performing initial value compensation every four hours, and automatically selecting a proper fire alarm threshold judgment value according to the size of the initial value of the detector to perform fire judgment.

Description

Technical field: [0001] The invention belongs to the technical field of fire detection, in particular to a linear infrared beam smoke detector and a detection method thereof. Background technique: [0002] The linear infrared beam smoke detector detects the concentration of smoke diffused into the beam area when a fire occurs, so as to achieve automatic detection and alarm at the initial stage of fire, and protect life and property safety. It has the advantages of large protection area and high installation position. Suitable for protecting indoor and outdoor places with large spaces. However, the existing linear infrared beam smoke detectors still have two common defects in engineering applications: 1. Poor anti-light interference ability: it is easy to make mistakes under the interference of ambient light such as incandescent lamps, xenon lamps, and sunlight; In order to reduce the false alarm rate of the detector in practical applications, it is usually adopted to make t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08B17/103
Inventor 翁立坚吴莹宋珍
Owner SHENYANG FIRE RES INST OF THE MIN OF PUBLIC SECURITY
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