Device and method for measuring millimeter-wave radiation characteristics of fiber fabrics
A fiber fabric and radiation characteristic technology, applied in the field of millimeter-wave radiation characteristic measurement devices, can solve the problems of complex methods, high requirements for measurement equipment and environment, and low precision, and achieve simple and convenient operation, reduce measurement equipment and environmental requirements, and improve The effect of measurement accuracy
Inactive Publication Date: 2018-01-05
NANJING UNIV OF SCI & TECH
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Problems solved by technology
[0004] The purpose of the present invention is to provide a millimeter-wave radiation characteristic measurement device and measurement method for fiber fabrics, which solves the problems of complex methods for measuring the radiation characteristics of fiber fabric materials, high requirements for measurement equipment and environment, and low precision.
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[0070] The antenna of the radiometer used in this embodiment is a Cassegrain antenna with an aperture of 130mm, a main beam width of 3.9°, a gain of 30dB, and a working frequency of 32-36GHz; the center frequency of the radiometer system is 34.5GHz, and the system bandwidth is 2GHz, the integration time is 0.1s, the sensitivity is 0.3K; the diameter of the cylinder is 200mm, the height is 100cm, and the inner surface is pasted with wedge-shaped absorbing material; in order to ensure the normal operation of the rectangular frame, avoid the friction between the rectangular frame and the cylinder , there is a gap of 10mm between the first plane and the second plane. The motor used in the turntable is a two-phase four-wire stepping motor with a step angle of 1.8°. The data acquisition card has 2 acquisition channels, the range is 0-10V, the sampling frequency is 200Hz, and the resolution is 16 bits.
[0071] The servo system controls the operation of the turntable and drives the ...
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The invention discloses a measuring device and method for measuring the millimeter-wave radiation characteristics of fiber fabrics. The device includes a cylinder, a millimeter-wave radiometer, a support frame, a rectangular frame, a turntable, a pole, a servo controller, a data acquisition card, and a thermometer. and computer; during measurement, the servo controller controls the rotation of the turntable so that the antenna of the millimeter-wave radiometer is aligned with the absorbing material, the fiber fabric and the sky for measurement, and the corresponding output signal of the millimeter-wave radiometer is collected by the data acquisition card, and the fiber is realized through the computer. Measurement of millimeter wave radiation properties of fabrics. The invention does not need to be measured in a darkroom, significantly reduces the requirements for the measurement environment and measurement equipment, has low cost, is simple and convenient to operate, and improves the measurement accuracy of the radiation characteristics of the fiber fabric.
Description
technical field [0001] The invention relates to a fiber fabric radiation characteristic testing technology, in particular to a fiber fabric millimeter-wave radiation characteristic measuring device and a measuring method. Background technique [0002] All substances in nature, as long as they are above absolute zero, will radiate electromagnetic energy on the entire electromagnetic spectrum. The radiation characteristics of actual objects in nature are more complicated. It is not only related to the geometric characteristics of the surface or interior of the object, but also related to the distribution of the dielectric constant of the medium inside the object. Therefore, it is difficult to describe the actual object as accurately as describing an ideal black body. The radiation characteristics of objects are mainly described by emissivity parameters. Generally speaking, objects with higher dielectric constant or conductivity have lower emissivity and higher reflectivity. ...
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IPC IPC(8): G01V3/12
Inventor 吴礼谢蓬丹蒋张涛王磊徐峰彭树生肖泽龙许建中
Owner NANJING UNIV OF SCI & TECH