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A Field Calibration Method for Ground-Based Infrared Cloud Meter

An on-site calibration and cloud measuring technology, which is applied in the field of atmospheric detection, can solve the problems such as the decrease in measurement accuracy of external lenses and germanium glass protection sheets, and achieve the effect of overcoming the decrease in measurement accuracy and ensuring stability

Active Publication Date: 2017-02-15
PLA UNIV OF SCI & TECH
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Problems solved by technology

[0004] The purpose of the present invention is to propose an on-site calibration method and mechanism for the uncontrollable decline in measurement accuracy caused by the aging of the external lens and germanium glass protection sheet after the current ground-based infrared cloud measuring instrument has been working in the field for a long time. On-site calibration of the ground-based infrared cloud measuring instrument was carried out regularly

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  • A Field Calibration Method for Ground-Based Infrared Cloud Meter
  • A Field Calibration Method for Ground-Based Infrared Cloud Meter

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Embodiment Construction

[0014] The on-site calibration device of the ground-based infrared cloud meter consists of a portable point source black body, a guide rail and a supporting mechanism, an acquisition and control module, and a data processing module. Among them, the temperature control accuracy of the portable point source blackbody is ±0.1°C, the effective emissivity is greater than 0.95, and the working temperature range is -20°C to 50°C. It is placed on horizontal and vertical rails and supported by brackets. The guide rail can be reliably controlled by the control module, and the displacement can be controlled to centimeter level. The horizontal and vertical displacements are not less than 20cm. The acquisition and control module includes a guide rail position adjustment sub-module, a point source black body temperature adjustment sub-module, a data acquisition sub-module, etc. The data processing module is mainly used to obtain calibration coefficients through data analysis.

[0015] Wh...

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Abstract

The invention discloses a foundation infrared ceilometer on-site calibration method. A portable point source black body is adopted, a two-dimensional fine position adjustment mechanism is additionally arranged, so that the two-dimensional position of the point source black body is fine adjusted; the point source black body has at least two temperature calibration points in the actual calibration process, and calibrated temperatures of the two temperature calibration points keep stable on two temperature points with the temperature difference of at least 30 DEG C. On each temperature point, a plurality of detection pixel points are evenly distributed in a radiation image obtained through an optical assembly of a foundation infrared ceilometer by adjusting the position of the point source black body; then the pixel points are calibrated in a two-point mode, a correction coefficient is obtained, then interpolating is carried out according to a stored original calibration coefficient matrix and latest correction coefficients of the detection pixel points and a full correction coefficient is obtained.

Description

technical field [0001] The invention belongs to the field of atmospheric detection, and in particular relates to an on-site calibration method and device for a ground-based infrared nephelograph. Background technique [0002] Ground-based infrared nephelometers generally use a large field of view uncooled infrared focal plane array as the core device, so as to continuously obtain atmospheric downward infrared radiation day and night. However, this device has disadvantages such as temperature drift, time drift and non-uniformity. In order to ensure the accurate measurement of the infrared radiation value, the instrument generally needs to be calibrated before leaving the factory. In addition, an internal calibration blackbody will be installed inside the ceilometer, and it is necessary to shoot at the inner blackbody and deduct the drift during each measurement. For example, an uncooled focal plane infrared cloud measurement method disclosed in the invention patent CN100510...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01W1/00G01J5/10
Inventor 刘磊高太长赵世军张婷韩文宇黄威
Owner PLA UNIV OF SCI & TECH
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