KEYWORDS: Black bodies, Temperature metrology, Infrared radiation, Control systems, Temperature sensors, Neural networks, Infrared imaging, Imaging systems
With the further development of the technology, the application of infrared imaging detection system environment gradually extended to the external field, high altitude, near space and outer space, etc. Its working temperature range is getting wider and wider, low temperature can reach -50°C below, high temperature can reach 70°C above. Infrared imaging detection system needs to meet the requirements of quantitative detection technology in a wide temperature range to ensure the completion of corresponding functions. In order to ensure that the infrared detection system can perform performance testing, radiometric calibration and quantitative traceability in the whole temperature range, this paper developed a large-aperture high-precision fixed-point infrared radiation source with a wide temperature range, and its phase change medium is water. It mainly includes diaphragm assembly, radiation cavity, inner wall coating of radiation cavity, heating assembly, temperature control assembly, etc. After development, verification tests were carried out in high and low temperature environment, and the following indexes were achieved: effective emissivity ≥0.999, cavity opening diameter ≥60mm, and temperature measurement uncertainty: 5mK (k=2). It has been proved that it can meet the measurement and testing requirements of infrared detection system under wide temperature range.
Under complex weather conditions, the vehicle vision system has low recognition accuracy for traffic signs, and there are problems such as missed detection and false detection. An improved YOLOX-S traffic sign detection model is proposed. Firstly, a detection layer is added to the YOLOX-S network, so that the model can effectively detect the minimum target and improve the prediction ability of the model. Then the attention mechanism module is added to the YOLOX-S feature fusion network to strengthen the feature extraction function of the network. Finally, the data enhancement mechanism is introduced to the model, so that the detection of the model in severe weather such as haze and rain and snow has strong robustness. The detection model was tested on the Chinese Traffic Sign Detection Benchmark dataset (CCTSDB). The results show that the mAP @ 0.5 of the improved algorithm is 2.67 % higher than that of the original YOLOX-S algorithm, and the mAP @ 0.5: 0.95 is 4.58 % higher than that of the original YOLOX-S algorithm. The model meets the requirements of real-time detection.
KEYWORDS: Filtering (signal processing), Electronic filtering, Digital filtering, Error analysis, Signal processing, Sensors, MATLAB, Systems modeling, Control systems, Detection and tracking algorithms
The weighing accuracy is an important index of electronic belt scale. It is difficult to achieve accurate measurement due to the influence of environmental temperature and humidity, belt tension and mechanical vibration. The filtering algorithm is introduced into the belt scale data acquisition and processing system. By filtering the collected data can eliminate or reduce the system error and improve the weighing accuracy. By studying the composition structure, weighing principle and error source of belt scale weighing system to analyze and test three filtering algorithms. By comparing the experimental data, an improved adaptive filter algorithm can play a better role and improve the weighing accuracy. It is important to improve the dynamic weighing accuracy of electronic belt scale and reduce the error.
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