Receiving-transmitting integrated cloud information measurement system with compact structure

Abstract

The invention discloses a receiving-transmitting integrated cloud information measurement system with a compact structure. The system comprises a laser transmitting device, a subsequent optical receiving device and a photonic signal acquisition device. A semiconductor laser device is controlled to output 1064nm laser by a cloud information measurement system industrial control computer. Laser passes through a concave lens and then penetrates through a plane reflecting mirror which is arranged at an inclined angle of 45 degrees with a hole arranged in the middle, and penetrates through an achromatic lens group and is conducted to the atmosphere through a sealed window lens. A set of beam expanding and collimation device is formed by the concave lens and the achromatic lens group. Backward scattered light generated by interaction of laser beams and atmospheric aerosols, clouds and gas molecules is received by the same achromatic lens group, and is gathered in a small aperture diaphragm through reflection of the plane reflecting mirror and reaches an avalanche diode through collimation of a convex lens and through white noise interference filtering of a narrow band filter. Electric signals outputted by the avalanche diode are outputted to a photon counting collector via a connecting line. Echo signals acquired by the photon counter are transmitted to a host via a network cable. The invention discloses a receiving-transmitting integrated cloud information measurement system with a compact structure. The system comprises a laser transmitting device, a subsequent optical receiving device and a photonic signal acquisition device. A semiconductor laser device is controlled to output 1064nm laser by a cloud informationmeasurement system industrial control computer. Laser passes through a concave lens and then penetrates through a plane reflecting mirror which is arranged at an inclined angle of 45 degrees with a hole arranged in the middle, and penetrates through an achromatic lens group and is conducted to the atmosphere through a sealed window lens. A set of beam expanding and collimation device is formed by the concave lens and the achromatic lens group. Backward scattered light generated by interaction of laser beams and atmospheric aerosols, clouds and gas molecules is received by the same achromatic lens group, and is gathered in a small aperture diaphragm through reflection of the plane reflecting mirror and reaches an avalanche diode through collimation of a convex lens and through white noise interference filtering of a narrow band filter. Electric signals outputted by the avalanche diode are outputted to a photon counting collector via a connecting line. Echo signals acquired by the photon counter are transmitted to a host via a network cable.

Description

technical field [0001] The invention relates to an optical telemetering device, in particular to a transmitting and receiving device of a cloud information measuring system, especially a transmission coaxial transmitting and receiving device of the cloud information measuring system. Background technique [0002] Clouds play an important role in atmospheric radiation. Cloud amount, cloud type, cloud shape, and cloud height directly affect the radiation amount of solar radiation to the ground and the upward radiation amount of infrared radiation. Clouds play an important role in the balance of ground temperature, and Directly affects weather and meteorological changes locally and globally. Because the temporal and spatial distribution of clouds varies greatly, it is difficult to predict and measure cloud height and cloud amount. The interaction between the semiconductor laser and the cloud produces a strong backscattering signal. By receiving the echo signal of the cloud, th...

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Problems solved by technology

[0003] Reflective Cassegrain telescopes are often used as optical receiving telescopes in the market. The transmitting unit and receiving unit adopt two structures: coaxial and non-coaxial. Large; the installation and adjustment of the reflective Cassegrain telescope is difficult, and after long-term transportation in the field, the positions of the primary and secondary mirrors are prone to change, and subsequent maintenance is inconvenient; the last reflector in the transmitting unit is used to adjust the optical axes of the reflecting unit and the receiving unit Parallel and coaxial, the reflector must be firmly locked after the adjustment is completed. The temperature difference between day and night and the four seasons of the environment will cause slight changes in the adjustment frame. Since the field of view is generally designed to be less than or equal to 0.5mrad, it often leads to the rear of the atmosphere and clouds. The scattered signal cannot be completely received by the receiving telescope, and it is very likely that the long-distance cloud signal will be lost

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