【摘要】 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。更多还原

【Abstract】 In measuring of liquid storange tanks, it is necessary to modify the temperature to achieve very high precision for temperature measuring of liquid storage tanks.In this research, high precision, fast response, and high sensitivity film platinum resistors are used for temperature measuring elements. Th e resistances of film platinum resistors are scattered, so the temperature measuring bridges are difficult to be uniform.In order to make one meter match different temperature measuring probes,MCS-51 single chip microcom puter is used in this paper,to make the instrument intelligent.On the basis of one temperature measuring probe of film platinum resistor the error with other probes is corrected by the single chip microcomputer, therefore one instrument can match different proles.In this paper,the new method for the nonlinear modification of temperature measuring elements has given new light to the interface mode of bridge temperature measuring with high precision A/Dconvertor,and also has certain sigificance for various other physical measurements.更多还原