High-precision infrared radiation measuring method

Abstract

The invention discloses a high-precision infrared radiation measuring method. The method comprises the steps of system working point calibration; raw data preprocessing; calculation of theoretical pixel radiation quantity; construction and training of a recurrent neural network; prediction of the pixel radiation quantity by using the trained network; inversion of target radiation information according to the pixel radiation quantity; during radiation measurement, the integral time can be continuously and dynamically adjusted. According to the method, calibration data of different integral times and different temperatures is integrated into a whole database, by means of a neural network loss function and an error back-transfer mechanism, various parameters reflecting linear and nonlinear response characteristics of the detector are learned, the correlation of the calibration data of different integral times and different temperatures is fully exploited, resistance to systematic random errors during calibration is stronger, the network obtained by training has good generalization and nonlinear regression ability, and the radiation quantity with un-calibrated integral time and temperature points in the work range can be accurately predicted.

Description

technical field [0001] The invention belongs to the field of infrared system radiation measurement, and in particular relates to a high-precision infrared radiation measurement method. Background technique [0002] Infrared focal plane array belongs to the second-generation infrared imaging device and is one of the core components of the infrared system. It has the advantages of high integration, low noise equivalent temperature difference, and strong detection ability. It is widely used in industry, agriculture, medical treatment, and forest fire prevention. , military and other fields, among which infrared radiation measurement is one of the important applications of infrared focal plane array. [0003] Infrared radiometry requires solving the mathematical regression from detector gray scale response to infrared radiometric information. Infrared radiation information includes radiation intensity, irradiance, radiance, radiation power, equivalent temperature, etc. The the...

AI Technical Summary

Problems solved by technology

[0007] 1. The integration time gear is fixed: limited by factors such as storage capacity and calibration workload, the system can only store multiple sets of fixed integration time coefficient groups, and cannot dynamically select the best integration time, which makes it difficult to give full play to the performance of the infrared system;

[0008] 2. The measurement accuracy is poor: the parameter calculation of the conventional method is grouped and carried out independently according to the integration time, and the correlation between different integration times is ignored. The calibration data is easily affected by the system error and the accuracy is low. Big error in radiation measurement value when bit switching

[0009] 3. The radiation calibration workload is heavy: since the uncalibrated integration time cannot be used in the future use of the system, the system needs to calibrate multiple sets of temperature points under multiple sets of integration times, resulting in a large workload and low efficiency for infrared system calibration. lower

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