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Combined temperature sensor

A temperature sensor and combined technology, applied in thermometers, instruments, scientific instruments, etc., can solve the problems of inaccurate sensor measurement and large time constant, and achieve the effect of fast thermistor, simple algorithm and excellent performance

Inactive Publication Date: 2007-01-03
QINGDAO UNIV OF SCI & TECH
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  • Summary
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Problems solved by technology

During the measurement process, using a stable platinum resistor to calibrate the unstable thermistor can overcome the shortcomings of poor repeatability and interchangeability of the thermistor. When the ambient temperature fluctuates greatly, the temperature sensor itself can be seen It is the first-order inertial link. At this time, the dynamic error becomes the main source of inaccurate sensor measurement. Use fast and sensitive thermistors to overcome the shortcomings of large time constants of platinum resistors.

Method used

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Embodiment Construction

[0011] refer to figure 1 , a combined temperature sensor consists of two parts: sensing and transmission. Wherein, the sensing part is composed of a platinum resistor 1 , a thermistor 2 , a clamping piece 3 , a protective sleeve 4 and a wire 5 . The platinum resistance measuring circuit is composed of an unbalanced bridge 6, and the thermistor measuring circuit is composed of a voltage-dividing measuring circuit 7, and their output enters a microprocessor 8 to obtain an analog or digital output. The structure of the combined temperature sensor is not limited to figure 1 structure shown.

[0012] refer to figure 2 , The platinum resistance measurement circuit uses an unbalanced bridge, and it also includes a differential amplifier circuit. Reasonably adjust the potentiometer RP1 to adjust the zero point of the measurement circuit. Adjust RP2 reasonably, and adjust the output of the amplifying circuit to be a standard voltage signal of 1-5V. refer to Figure 4 , the ther...

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Abstract

The invention is concerned with the design method of the combined temperature sensor, including the protecting sleeve, the platinum resistance, the thermistor, the connecting line, the measuring circuit, and the microprocessor. The sensor samplings the measure result of the platinum resistance and the thermistor when it works. The platinum resistance with stable capability and good linearity during the steady state demarcates the thermistor, which solves the shortage of the thermistor that is low dispersing and re-existing; the platinum resistance uses the character of the thermistor that is rapid reaction and high delicacy to conquer the shortage of big time-constant when the ambient temperature changes acutely.

Description

technical field [0001] The invention relates to a temperature sensor, more specifically, it is a combined sensor which uses a platinum resistance and a thermistor to simultaneously measure temperature, and uses a microprocessor to combine their results. Background technique [0002] Temperature sensor is the core component of temperature measuring instrument and an important part of temperature control system. It is widely used in production and life, and has been a hot research and development topic for a long time. Commonly used thermal resistance temperature-sensitive materials include platinum, copper, nickel, semiconductors, etc., and their characteristics are very different. Platinum, copper, and nickel belong to metal resistors. These materials are stable in nature, mature in production technology, and have good reproducibility and interchangeability. However, the heat capacity of metal materials is large, which causes their response time to be long. Although in Many...

Claims

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Application Information

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IPC IPC(8): G01K7/18G01K7/22G01K7/25
Inventor 刘川来胡乃平王焱严以刚
Owner QINGDAO UNIV OF SCI & TECH
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