Abstract：In order to solve the problems of low working efficiency of the traditional calibration device for digital thermo-hygrometers which is unable to meet the growing demand and the data by manual record cannot be rechecked and traced. Using machine vision technologies such as image segmentation, processing, character recognition and so on. An automatic calibration system for multi-meter digital thermo-hygrometers is designed based on LabVIEW. More than 10 models and a total of 30 digital thermo-hygrometers were used for automatic calibration experiments. The experimental results show that the recognition accuracy of the automatic calibration system is more than 99.3% and the calibration results can be ensured to be correct through manual recheck, which verified the reliability of the automatic calibration device and system.
周逸,潘永杲,闵琪涛,姚建,李峻,陈璐,缪文娇. 基于机器视觉的多表位数字温湿度计自动校准系统研究[J]. 计量学报, 2023, 44(8): 1214-1221.
ZHOU Yi,PAN Yong-gao,MIN Qi-tao,YAO Jian,LI Jun,CHEN Lu,MIAO Wen-jiao. Research on Automatic Calibration System of Multiple Digital Thermo-hygrometers Based on Machine Vision. Acta Metrologica Sinica, 2023, 44(8): 1214-1221.
Tang S M, Zhao J Y, Lu X F. A novel water meter calibration method based on machine vision technology ［J］. Acta Metrologica Sinica, 2015, 36 (1): 54-57.
Liu L X, Ning W L. The design of low power temperature and hygrometer based on single chip microcomputer ［J］. Journal of Yulin Normal University, 2018, 39 (2): 29-34.
Xing X L, Gan W B, Jiang C G. Technology of size detection of air rivets based on machine vision ［J］. Acta Metrologica Sinica, 2020, 41 (5): 518-523.
Wu K Y, Zhu H Q, Shen X D, et al. Research on intelligent verification system of pointer pressure meter based on machine vision ［J］. Acta Metrologica Sinica, 2022, 43 (11): 1450-1455.
Mu L, Liang X Z, Ma Y, et al. Development of the verification system of thermohygrometer with automatic photo taking ［J］. Chemical Analysis and Meterage, 2021, 30 (10): 72-77.
Ding S,Ren G Y,Zhang F M,et al. Improved Threading Method for Caliper Image Recognition［J］.. Acta Metrologica Sinica, 2019, 40(5): 765-769.
Wei X K, Jiang Z, Fu C X, et al. Research and application of dynamic Niblack algorithmbased on illumination impact factor ［J］. Computer Engineering and Design, 2022, 43 (4): 1066-1073.
Zhou W S, Luo J. Measurement uncertainty analysis of calibration results of digital temperature-hygrometers ［J］. Metrology & Measurement Technique, 2022, 49 (8): 118-122.
Cai Y H, Sun X H. Research on algorithm of camera automatic horizontal observing mark of glass gauge ［J］. Acta Metrologica Sinica, 2022, 43 (1): 72-76.
Ma Q L, Ren M Z, Li H L. Development of digital multimeter automatic calibration system based on image recognition ［J］. Metrology & Measurement Technique, 2021, 48 (6): 35-37.
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JJF 1076—2020 数字式温湿度计校准规范［S］.
Zheng B W. Development of automatic water meter verification device based on machine vision technology ［J］. China Measurement & Test, 2021, 47 (S2): 149-152.
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彭诚, 丁蔚, 侯旭玮. 基于机器人技术的手持式数字万用表全自动校准系统开发 ［J］. 计量学报, 2019, 40 (Z1): 64-68.Peng C, Ding W, Hou X W. Development of automatic test system for hand-held digital multimeter based on robotics ［J］. Acta Metrologica Sinica, 2019, 40 (Z1): 64-68.
Lin K N, Zhuang Y, Huang Y M. Research on small flow verification method of water meter based on machine vision ［J］. Acta Metrologica Sinica, 2021, 42 (9): 1167-1171.
2023, Vol. 44 
