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Digital display temperature detection system and digital display temperature detection method

A technology of digital display and detection system, applied in the field of digital display temperature detection and digital display temperature detection system, can solve the problems of high cost and difficult to take into account, and achieve the effect of low cost and low power consumption

Active Publication Date: 2012-07-18
西安广芯电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to solve the problem that the existing digital display temperature detection system using NTC thermistor sensor is difficult to take into account the requirements of high resolution and wide range temperature detection and high cost, because the requirements for resolution and measurement range are not very high. Provide a digital display temperature detection system and a digital display temperature detection method for harsh application fields

Method used

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  • Digital display temperature detection system and digital display temperature detection method

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Embodiment 1

[0034] This embodiment is the realization of a digital display temperature detection system.

[0035] The digital display temperature detection system is shown in Figure 1(a). The NTC thermistor prepared by the low-temperature sintering process is used as the temperature sensor probe, which is fixed in the brass shell with epoxy resin to make a temperature detection probe. Sensitive resistors are made of sensor probes (1) and 3 resistances are always R 0 The resistance R 1 , R 2 and R 3Connect them together to form a Wheatstone bridge, as an analog voltage signal acquisition circuit (2), as shown in Figure 1(b), the collected analog voltage signal is transmitted to the fast successive comparison type 12 The analog / digital converter AD1674(4), the analog / digital converter AD1674(4) then transmits the converted digital signal to the AT89C51 single-chip microprocessor (5) with a word length of 8 bits, and the microprocessor (5) Process the 12-bit digital signal, convert the v...

Embodiment 2

[0075] This embodiment is the realization of the digital display temperature detection method corresponding to the digital display temperature detection system.

[0076] The digital display temperature detection method based on AT89C51 single-chip microcomputer is composed of signal acquisition module, de-extreme value filtering and averaging module, table look-up and temperature value conversion module, temperature value conversion module, scanning drive module and table module. as attached Figure 4 As shown, at first, call the signal acquisition module 6 times, control the analog / digital converter (4), continuously collect 6 analog voltage signals, and convert them into digital signals, and send them to the microprocessor (5); then call the depolarization The value filtering and averaging module sorts the collected 6 digital voltage signals by bubbling method, removes the maximum value and minimum value, then accumulates the remaining 4 groups of digital voltage signals and...

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Abstract

The invention relates to a high-resolution, wide-measurement range and low-cost digital display temperature detection system and a digital display temperature detection method. The digital display temperature detection system consists of a sensor probe, an analogue voltage signal acquisition circuit, an instrumentation amplifier, an analogue / digital converter, a processor, a drive chip and a digital display. The digital display temperature detection method comprises the following steps of: calling a signal acquisition module to perform voltage value sampling; calling an extreme value eliminating, filtering and averaging module to solve an average value; calling a table searching and temperature value converting module to convert the voltage value into a temperature value; calling a temperature value numerical system conversion module to convert a binary temperature value into a decimal temperature value; and calling a scanning drive module to perform dynamic scanning display. By the system and the method, the resolution of 0.1 DEG C and the measurement range of -15 to +80 DEG C are realized; and the problem that the conventional temperature gauge difficultly balances high resolution, wide measurement range and low cost is solved.

Description

technical field [0001] The invention relates to the technical field of digital temperature measurement, and relates to a digital display temperature detection system and a digital display temperature detection method with high resolution, wide measurement range and low cost. Background technique [0002] In the fields of industrial and agricultural production, national defense and scientific research, the digital display temperature detection system has important applications due to its advantages of accuracy and intuition. In the design of the digital display temperature detection system, the temperature sensor is generally used as the probe for temperature detection. The temperature sensor can convert the change of temperature into the change of the electric quantity (such as resistance, potential, etc.) that can be measured. The design of the digital display temperature detection system is generally to connect the temperature sensor to the detection circuit, and then coll...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K7/22
Inventor 高峰姜坤胡国辛曲海亮张丽娜
Owner 西安广芯电子科技有限公司
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