Multi-angle forward scattering transmittance meter

A forward scattering and visibility technology, applied in the field of visibility measurement, can solve problems such as poor stability, low detection accuracy, and complicated operation, and achieve the effects of improving reliability, accurate data, and improving precision

Inactive Publication Date: 2012-06-20
HARBIN INST OF TECH
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Problems solved by technology

[0005] The purpose of the invention is to provide a multi-angle forward scattering visibility measuring instrument, which mainly solves t

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  • Multi-angle forward scattering transmittance meter
  • Multi-angle forward scattering transmittance meter
  • Multi-angle forward scattering transmittance meter

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[0021] In order to make the purpose, technical solutions and advantages of this creation clearer, the creation will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0022] refer to figure 1 As shown, the principle of multi-angle forward scattering is as follows: the light emitted by the light-emitting diode 1 at the transmitting end enters the atmosphere through the convex lens 2, and after the emitted light is scattered by the atmosphere 6, in order to make the optical signals received by the photoelectric sensor in the receiving end basically all come from the near Infrared diodes, reduce the impact of sunlight and light on the photoelectric sensor, add an infrared filter (7, 8, 9) before the photoelectric transistor (10, 11, 12), filter out visible light, and then pass th...

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Abstract

The invention discloses a multi-angle forward scattering transmittance meter, which comprises a transmitting terminal, a receiving terminal and a control system, wherein the transmitting terminal comprises a modulation circuit and a light source transmitting unit; the receiving terminal comprises photoelectric conversion units and a signal processing circuit; the light source transmitting unit emits a light pulse with a fixed frequency; the emitted light is received by three photoelectric conversion units arranged in a forward scattering direction, and converted into an electric signal after being scattered by atmosphere under the action of the modulation circuit; a weak tested signal is detected through the signal processing circuit and the tested signal is collected through an A/D (alternating/direct) chip, and corresponding meteorological visibility can be calculated by an ARM (Advanced RISC (Reduced Instruction-Set Computer) Machines) embedded control system. According to the invention, different scattering phase factors correspond to different scattering phase functions so that the visibility precision is improved; a scattering signal is received by three scattering angles with 20, 35 and 50 degrees; the fault of a photoelectric detector is judged by comparison of three visibility values and the reliability of a visibility meter is improved.

Description

technical field [0001] The invention belongs to the technical field of visibility measurement, in particular to a multi-angle forward scattering visibility measuring instrument for measuring the visibility of expressways. Background technique [0002] In meteorology, visibility is the maximum distance at which an object can be clearly identified. Visibility measurement currently has visual inspection, and also uses atmospheric transmissometer, laser visibility automatic measuring instrument, etc. for measurement. The United States started earlier in the theoretical research of visibility instruments and applied them earlier. The development of American science and technology economy and the development of aerospace make the United States pay more attention to the development and research of visibility instruments. Many companies in the United States are developing various visibility meters, such as EG&G Environmental Company, Handar Company, Hss Company, Carl Science Compa...

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Application Information

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IPC IPC(8): G01N21/53
Inventor 李成伟彭鹏
Owner HARBIN INST OF TECH
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