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Noise equivalent temperature difference test method and system of infrared thermal imager

A noise-equivalent temperature difference and infrared thermal imaging camera technology, applied in the field of optical detection, can solve the problems of low test accuracy of NETD, and achieve the effect of real and reliable data reference and accurate measurement

Active Publication Date: 2019-08-06
WUHAN GAOXIN TECH
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Problems solved by technology

[0004] The purpose of the invention is to overcome the problem that the NETD test accuracy of the infrared camera product in the prior art is low

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  • Noise equivalent temperature difference test method and system of infrared thermal imager
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  • Noise equivalent temperature difference test method and system of infrared thermal imager

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Embodiment Construction

[0046] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0047] In describing the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", The orientations or positional relationships indicated by "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than in...

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Abstract

The invention provides a noise equivalent temperature difference test method and system of an infrared thermal imager, and belongs to the technical field of optical detection. A blackbody temperaturedifference scope is set according to the dynamic range of the infrared thermal imager, at least two temperature points are selected in the blackbody temperature difference scope, signal response dataof a calculation area including the temperature points with the blackbody temperature difference scope is collected after that the temperature is table and a mean value is calculated, a mean value andtemperature difference curve is drafted according to the signal response data, a curve gradient, namely the responsivity value, is fit by a least square method, and the noise equivalent temperature difference (NETD) of the infrared thermal imager is obtained according to the responsivity value and test noise. Thus, the NETD of an infrared product is measured accurately, the real NETD level of theinfrared product is reflected more accurately, a unified NETD test system platform is formed, and real and reliable data reference is provided for test aimed at knowing the real situation at the early stage of bidding.

Description

technical field [0001] The invention belongs to the technical field of optical detection, and in particular relates to a noise equivalent temperature difference testing method and system of an infrared thermal imager. Background technique [0002] In the process of using an infrared camera to measure the infrared radiation characteristics of a target, it is often necessary to measure the effective operating distance of the infrared camera, and estimate the measuring distance of the infrared camera according to the effective operating distance. Generally, the measuring distance of the infrared camera should be smaller than the effective working distance. The noise equivalent temperature difference (NETD) is a key parameter that affects the calculation accuracy of the effective operating distance. [0003] At present, the general test method of NETD is to collect two-level temperature data. Due to the small number of sampling temperature points, the calculated response rate w...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J5/00
CPCG01J5/00
Inventor 张勇孙小敏王育强齐哲明
Owner WUHAN GAOXIN TECH
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