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Method of measuring the concentration and/or size of suspended particles by forward scattering of light

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专利汇可以提供Method of measuring the concentration and/or size of suspended particles by forward scattering of light专利检索,专利查询,专利分析的服务。并且A method for measuring the concentration and/or size of illuminated particles suspended in a gas by means of the scattered light process. The suspended particles are illuminated by passing them through a focused laser beam in the vicinity of its focal plane. The light that is scattered from the particles in the direction of propagation of the laser beam within an angle of + OR - 15* with respect to the focal line of the laser beam are then evaluated by a photodetector device to determine the desired parameter. The intensity of the laser beam is reduced if the anode current of the photodetector exceeds a preset limit. The output signal of the photodetector device is fed to a potentiometer which has a logarithmic resistance per unit of its length. The output of the potentiometer is fed to a fixed single channel pulse height analyzer, which records all the pulses above a predetermined threshold value and transmits them to a counter.,下面是Method of measuring the concentration and/or size of suspended particles by forward scattering of light专利的具体信息内容。

1. A method for measuring both separately and simultaneously the concentration and size of suspended particles, comprising the steps of: A. illuminating the particles by passing them through a focused laser beam at a point substantially in a focal plane defined by the laser beam; and b. detecting substantially all of the light scattered from the laser beam by the particles and substantially none of the unscattered light within an angle of + OR - 15* with respect to the direction of propagation of the laser beam.
2. The method of claim 1, wherein said detecting step includes the step of detecting the scattered light with a photodetector and reducing the intensity of the laser beam if the anode current of the photodetector exceeds a predetermined value.
3. The method of claim 2, further including the step of triggering a Kerr cell to reduce the intensity of the laser beam.
4. The method of claim 2, further including the step of triggering a Pockel cell to reduce the intensity of the laser beam.
5. The method of claim 2, wherein the detecting step further includes the step of feeding the output of the photodetector to a potentiometer having logarithmic resistance per unit of its length.
6. The method of claim 5, wherein the detecting step further includes the step of feeding the output of the potentiometer to a fixed single channel pulse height analyzer.
7. The method of claim 6, wherein the potentiometer has a tap, and is calibrated in particle sizes with a logarithmically subdivided scale, and the feeding from the potentiometer is at the tap.
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