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在储罐液体质量的计量中,要准确计量其质量,必须对储罐液体的温度加以修正,以使温度测量有较高的精度。在本研究中,采用了精度高,响应速度快,而且灵敏度高的薄膜铂电阻作为测量元件。但是,由于薄膜铂电阻的阻值具有离散性,从而使测温桥路难以一致。为能用一台储罐测温仪配用不同的薄膜铂电阻测温探头,从而节省多个测温仪表,本研究使用了 MCS—51单片机,使仪器智能化;以一个薄膜铂电阻测温探头为基准,由单片机校正与其它探头之间的测量误差。该洲温仪通过键盘输入罐号,从而能准确测量多达100个不同储罐的温度。本文对测量元件的非线性所采用的修正方法,对测量桥路与高精度A/D 转换器的接口方式,都提出了新的思想,这对其它物理量的测量也有一定的意义。
In the measurement of the liquid quality of the tank, to accurately measure its quality, the temperature of the liquid in the tank must be corrected so that the temperature measurement has higher accuracy. In this study, the use of high precision, fast response, and high sensitivity platinum resistance as a measuring element. However, due to the resistance of thin film platinum resistance discrete, so that the temperature measurement bridge is difficult to coincide. In order to save a lot of temperature measuring instruments, a MCS-51 single-chip microcomputer can be used in a tank thermometer equipped with different thin film platinum resistance temperature probes to make the instrument intelligent. The temperature of a thin film platinum resistance Probe as a benchmark, calibrated by the microcontroller and other probes between the measurement error. The Chauwenger enters the tank number through the keypad, enabling accurate measurement of the temperature of up to 100 different tanks. In this paper, the correction methods adopted for measuring the nonlinearity of the measuring device and the interface way for measuring the bridge and the high-precision A / D converter are put forward a new idea, which is also of some significance for the measurement of other physical quantities.