Researches Of Without Electricity Environment Mercury Thermometer Conversion Device

Temperature is an important physical parameter, which is the most common and basic process parameters, both industrial and agricultural production, scientific research and national defense modernization are inseparable from the temperature measurement. Temperature measurement technique is one of the highest frequency application technology of modern testing technology. For inflammable and explosive environment temperature measurement uses artificial reading method regularly, it is the workload and low-security, it is not easy to manage. Active devices can not be used for automatic measurement, so this paper has presented a mercury thermometer conversion device:The use of traditional mercury thermometer shows the temperature on the scale,then the optical method is used to transform the temperature on the thermometer into light intensity value(light signal),and use the optical fiber to implement the transmission of light, the data is processed by single-chip microcomputer.Based on the investigation of relevant literatures, first, the principle of the conversion device is discussed in details. For the optical path disturbances which affect the precision of temperature measurement of the whole conversion device, the double optical paths compensation methods were used to overcome the optical path of the device may exists in the disturbance.Second, this paper introduces the components of the optical system and the circuit system. The characteristics of each parts of the device are discussed in details and a photoelectric detection circuit with high speed and low noise is developed. Last, the software and hardware structures of single-chip microcomputer are designed to analyze the data and display the temperature value.The measurement hardware circuit was simulated by using the simulation software Multisim, single-chip microcomputer software and hardware circuit was simulated by using the simulation software Proteus, the feasibility of conversion device was verified. The whole device was assembled, and experimented, the relevant experimental data was measured.