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Method and apparatus for Stocks scattering matrix measurement of particle in fire smoke

A scattering matrix and Stokes technology, applied in the measurement of scattering characteristics, fire alarms based on smoke/gas effects, special data processing applications, etc., can solve the problem of low angular resolution of scattered light signals and measurement of scattered light signals Angle distribution characteristics, poor precision and other issues

Inactive Publication Date: 2006-12-13
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

And "Fire Safety Journal" (Fire Safety Journal, 1997, Volume 29, pages 185-194) mentioned a fire smoke particle light scattering experimental device, which installed a multi-channel photomultiplier tube on the semicircle to measure the smoke particle The light scattering characteristics of smoke particles, the device can only measure the light intensity and linear polarization degree of scattered light, these two parameters are only two elements in the Stokes scattering matrix that describes the light scattering information of smoke particles in detail, and cannot be used for Stokes In addition, the device has a limited number of photomultiplier tubes installed on the ring, so it can only measure the scattered light at corresponding discrete angles, roughly Analyze the angular distribution trend of the scattered signal, but cannot measure the angular distribution characteristics of the scattered light signal in a small angular step, that is, the angular resolution and accuracy of the scattered light signal measured by the device are low

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  • Method and apparatus for Stocks scattering matrix measurement of particle in fire smoke
  • Method and apparatus for Stocks scattering matrix measurement of particle in fire smoke
  • Method and apparatus for Stocks scattering matrix measurement of particle in fire smoke

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Embodiment 1

[0015] The optical and mechanical components in the smoke particle Stokes scattering matrix measuring device of this embodiment are installed on an optical platform 22 of 1.4×1.6 meters, and a circular hole with a diameter of 0.1 meters is opened at the center of the optical platform 5. A square rotary table 4 with a cross-sectional size of 0.25×0.25 meters and a hole with a diameter of 0.08 meters in the center is installed at the very center of the optical table, so that the holes of the rotary table and the optical table coincide with each other. The smoke nozzle 7 passes through the opening of the optical platform and the rotating platform from bottom to top, and is installed on the optical platform through a three-dimensional adjustment component 8. The smoke particle flow ejected from the cigarette nozzle directly enters the smoke exhaust pipe directly above it , Only a section of about 3 cm long vertical smoke column 6 is exposed between the smoke nozzle and the smoke e...

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Abstract

The invention relates to a method and a device for measuring fire smoke particle Stokes scattering matrix. The invention is characterized in that the laser transmitted by the laser device enters into smoke particles and scatters after modulated by polaroid and electro-light modulator, after the adjustment by a three-dimensional adjusting device, the fire particles are located on the center of the rotary arm rotation; the rotary arm is fixed on a rotary disk and is driven to rotate around the smoke particles by motor controlled by a computer; an aligning eyelet, a 1 / 4 wave plate, a polaroid and a electron-multiplier phototube are sequentially installed the rotary arm; the signal measured by two electron-multiplier phototubes go through a phase-lock amplifier and is collected by computer, the electro-light modulator and the phase-lock amplifier are synchronized via signal generator.

Description

Technical field: [0001] The invention belongs to the technical field of fire detection, and in particular relates to a method and a device for measuring a Stokes scattering matrix of light scattering of fire smoke particles. Background technique: [0002] "Fire Safety Journal" (Fire Safety Journal, 1997, Vol. 29, pp. 77-85) published in the UK pointed out that smoke particles are one of the important characteristic parameters in the early stage of a fire. The development of smoke detection technology plays an important role. And "Fire Safety Journal" (Fire Safety Journal, 1997, Volume 29, pages 185-194) mentioned a kind of fire smoke particle light scattering experimental device. The light scattering characteristics of the smoke particle, the device can only measure the light intensity and linear polarization of the scattered light. These two parameters are only two elements in the Stokes scattering matrix that describe the light scattering information of smoke particles in...

Claims

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Application Information

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IPC IPC(8): G01N15/00G01N21/53G06F19/00G08B17/11
Inventor 谢启源张永明张和平乔利锋
Owner UNIV OF SCI & TECH OF CHINA
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