Design of Portable Infrared thermometer and Temperature Compensation Technology
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摘要: 红外体温计因安全卫生、测量高效而备受青睐，发展迅速。但目前市场上的红外体温计存在测量误差大、成本高等缺点，应用受到限制。鉴于此，首先分析了影响红外体温计测量精度的各种因素，并给出具体影响程度的计算结果，然后利用STM32F407单片机作为控制核心，通过MLX90615红外传感器、DS18B20集成温度传感器、HC-SR04超声传感器等获取信息，设计了一种面向医院、家庭等的廉价、可靠的便携式红外体温计，并给出温度补偿方法，最后通过实验测试验证了系统设计的可靠性。测试结果表明，最大综合误差不超过0.15℃，具有一定的实用价值与参考价值。Abstract: Infrared thermometers are popular because of their safety, hygiene, and high efficiency. However, commercial infrared thermometers have large measurement errors and high cost, so their application is limited. Considering this, this paper first analyzes various factors that affect the measurement accuracy of an infrared thermometer and gives the calculation results of the specific influence degree. Then, using STM32F407 MCU as the control core, an MLX90615 infrared sensor, DS18B20 integrated temperature sensor, and HC-SR04 ultrasonic sensor to obtain information, a cheap and reliable portable infrared thermometer for hospitals and families is designed, and a method of temperature compensation is provided. Finally, the reliability of the system design was verified by testing. The test results show that the maximum comprehensive error is less than 0.15℃, which has definite practical value and reference value.
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Keywords:
- infrared thermometer /
- STM32F407 /
- temperature compensation /
- MLX90615 /
- abnormal alarm
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图 1 红外体温计接收辐射能量示意图
Figure 1. Schematic diagram of infrared thermometer receiving radiation energy
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图 8 额温随环境温度变化关系
Figure 8. The relationship between forehead temperature and ambient temperature
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图 9 额温与体温对应关系
Figure 9. The relationship between forehead temperature and body temperature
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图 10 额温与探测距离关系
Figure 10. The relationship between frontal temperature and detection range
表 1 距离补偿测试结果
Table 1 The test results of distance compensation
Distance/cm A(Standard value: 36.70℃) B(Standard value: 36.87℃) C(Standard value: 37.70℃) Measured value /℃ Error/℃ Measured value /℃ Error /℃ Measured value /℃ Error /℃ 0.2 36.71 0.01 36.89 0.02 37.71 0.01 0.5 36.70 0.00 36.88 0.01 37.71 0.01 1.0 36.70 0.00 36.87 0.00 37.69 -0.01 2.0 36.70 0.00 36.87 0.00 37.71 0.01 3.0 36.68 -0.02 36.88 0.01 37.70 0.00 3.5 36.67 -0.03 36.86 -0.01 37.72 0.02 4.0 36.64 -0.06 36.85 -0.02 37.74 0.04 4.5 36.58 -0.12 36.83 -0.04 37.77 0.07 5.0 36.54 -0.16 36.78 -0.09 37.81 0.11 
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表 2 环境温度补偿测试结果
Table 2 The test results of ambient temperature compensation
℃ Ambient temperature A B C Error Measured value Standard value Error Measured value Standard value Error Measured value Standard value 12(Morning) -0.02 36.41 36.51 -0.10 36.67 36.70 -0.03 37.48 37.50 21(Noon) 0.01 36.67 36.70 -0.03 36.82 36.80 0.02 37.71 37.70 17(Afternoon) 0.05 36.81 36.87 -0.06 37.00 36.68 0.02 37.76 37.71
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表 3 综合测试结果
Table 3 Comprehensive test results
Environmental conditions Measurement object Measured value /℃ Standard value /℃ Error /℃ Alarm or not In the morning, no wind, no sunshine; ambient temperature: 10℃ A 36.39 36.51 -0.13 No B 36.61 36.60 0.01 No C 37.40 37.50 -0.10 Yes At noon, no wind, sunny; ambient temperature: 25℃ A 36.72 36.70 0.02 No B 36.92 36.80 0.12 No C 37.85 37.70 0.15 Yes At noon, windy and shady; ambient temperature: 22℃ A 36.68 36.70 -0.02 No B 36.80 36.80 0.00 No C 37.69 37.70 -0.01 Yes
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