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Smoke sensing method and device for detecting fire accident by reflected light beams

A smoke-sensing and detection method technology, which is applied to measurement devices, fire alarms that rely on the effect of smoke/gas, fire alarms, etc. Fire alarm and other problems, to eliminate the influence of environmental gradient factors, improve detection stability, and compensate for environmental gradients

Inactive Publication Date: 2003-10-29
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

However, since its transmitting part and receiving part are respectively installed at both ends of the detection space, the detector has the following defects in the reliability of fire detection:
[0003] ①When the emission intensity of the transmitting end changes due to the device or circuit components, it is impossible to compensate for the change of the infrared emission intensity at the receiving end, which is likely to cause false alarms; when the circuit parameters of the receiving end change, it is also easy to cause false alarms Phenomenon
[0004] ②Because of the separate power supply for transmitting and receiving, the stability of the power supply will affect the stability of the alarm
[0005] ③There is no function to compensate for environmental gradients
When the background light of the environment changes gradually due to natural factors, it is easy to cause continuous false alarm behavior
[0006] ④ The requirements for installation are more stringent
Due to a small vibration or displacement, it will cause continuous fire alarm of the equipment

Method used

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  • Smoke sensing method and device for detecting fire accident by reflected light beams
  • Smoke sensing method and device for detecting fire accident by reflected light beams
  • Smoke sensing method and device for detecting fire accident by reflected light beams

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Embodiment Construction

[0030] Referring to accompanying drawings 1(a), 2, the compensation measurement receiving amplifying circuit 1, the transmitting source 2 and the measuring receiving amplifying circuit 3 are arranged on the same circuit board. A reflective right-angle prism 5 is arranged in front of the compensation measurement receiving amplifier circuit 1, a light-splitting right-angle prism 4 is arranged in front of the emission source 2, a detection focusing prism 9 is arranged in front of the measurement receiving amplifier circuit 3, and a compensation measurement receiving amplifier circuit 1 is arranged between the reflective right-angle prism 5 There is a compensating focusing prism 10 , an emitting collimating prism 8 is arranged between the emitting source 2 and the dichroic prism 4 , and a reflecting rectangular prism 6 is arranged at the other end of the fire smoke 7 . The light emitted by the emitting light source 2 is divided into two paths at the beam splitting rectangular prism...

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Abstract

A smoke sensing method and device for detecting fire accident by reflected light beams features that the light signal transmitter and receiver are arranged at same side of detected space and a reflecting rectangular prism with reflection along original path is arranged at anothen side to form a single-source dual-chamber detection structure. Said device is composed of transmitting source, receiver and rectangular prism. Said transmitting source and receiver are on a same circuit board. Its advantages are better automatic compensation, intelligent comparison and high reliability.

Description

technical field [0001] The invention relates to the technical field of fire detection. Background technique [0002] In the field of fire detection, the technical equipment used for early fire detection in large spaces mainly includes the following types: 1. Separate beam smoke detectors, 2. Suction smoke detectors, 3. Image fire detection system, 4. Flame detectors. Among them, 1 and 2 are the detection of smoke from fire combustion products, 3. It can detect flame and smoke, 4. It can detect early fire infrared and ultraviolet radiation. Among these types of fire detectors, the separated beam smoke detector has the characteristics of large control area, low cost and sensitive response. It has always been trusted by users and is widely used in the world. However, since its transmitting part and receiving part are respectively installed at both ends of the detection space, the detector has the following defects in the reliability of fire detection: [0003] ①When the emis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/3504G01N21/53G08B17/10G08B17/103
Inventor 袁宏永范维澄刘炳海苏国锋
Owner UNIV OF SCI & TECH OF CHINA
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