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High precision intelligent platinum thermal resistance temperature sensor with correction function

A technology of temperature sensor and platinum thermal resistance, which is applied to thermometers, thermometers, instruments, etc. that use electric/magnetic elements that are directly sensitive to heat, can solve problems such as increasing system cost and increasing system complexity, and improve measurement accuracy. High precision, hot swap and automatic recognition effect

Inactive Publication Date: 2007-04-25
NAVAL UNIV OF ENG PLA
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Problems solved by technology

However, platinum thermal resistance still has inherent nonlinearity. At present, high-precision platinum thermal resistance temperature sensors generally use high-precision platinum thermal resistance or design complex correction circuits, and these measures will often greatly increase the cost of the system and increase the complexity of the system. degree

Method used

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  • High precision intelligent platinum thermal resistance temperature sensor with correction function
  • High precision intelligent platinum thermal resistance temperature sensor with correction function
  • High precision intelligent platinum thermal resistance temperature sensor with correction function

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Embodiment Construction

[0015] As shown in Figure 1: the platinum thermal resistance 1 of the present invention is connected to the sensor interface circuit 3 through the signal conditioning circuit 2; the EEPROM 5 is connected to the sensor interface circuit 3 through the I2C bus 4.

[0016] The platinum thermal resistance 1, the signal conditioning circuit 2, the sensor interface 3, and the EEPROM memory 5 are packaged into one, and the sensor interface circuit 3 is used as an output port connected to the data acquisition system, and is connected to the data acquisition system through a cable. The identity information, calibration information, and analog output level information of the platinum thermal resistance 1 are stored inside the EEPROM.

[0017] The definition of the sensor interface is as follows: +9V, -9V, GND are power transmission lines, SCL, SDA are I 2 Clock and data lines of the C bus. ADDR0 and ADDR1 are two address lines. A_OUT is an analog output signal line, and D_OUT is a digi...

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Abstract

The invention supplies a high-accuracy intelligent platinum resistance thermometer which has correction feature, it comprises platinum resistance and signal modulation circuit, the platinum resistance (1) is connected with the interface circuit of the sensor (3) via the signal modulation circuit (2), EEPROM(5) is connected with the interface circuit of the sensor (3) via the I2C bus (4), the identification information, correction feature information and analog output level information are all stored in the EEPROM. The correction engine used by correction feature information is the initial value positioning and square root correction, platinum resistance is Pt100, the method of initial value positioning is measuring the resistance value individually at the condition of choosing three reference temperatures, and calculating the temperature t with the quadratic approximation square root correction method based on relational expression between temperature and resistance of the platinum resistance Pt100.

Description

technical field [0001] The invention relates to a high-precision intelligent platinum thermal resistance temperature sensor with a correction function, which belongs to an instrument for temperature measurement and control, and is specifically a temperature sensor for measuring temperature according to the change rule of conductor resistance with temperature. Background technique [0002] The most commonly used resistance thermometers are temperature-sensing elements made of fired metal wires. There are mainly platinum resistance thermometers and copper resistance thermometers. Precision platinum resistance thermometers are currently the most accurate thermometers. However, platinum thermal resistance still has inherent nonlinearity. At present, high-precision platinum thermal resistance temperature sensors generally use high-precision platinum thermal resistance or design complex correction circuits, and these measures will often greatly increase the cost of the system and ...

Claims

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Application Information

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IPC IPC(8): G01K7/18G01K7/21G01K7/42
Inventor 叶晓慧张森吴媛媛
Owner NAVAL UNIV OF ENG PLA
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