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基于AD7799的熱敏電阻高精度測溫系統(tǒng)

2512791 2010-11-22 | rar | 483 | 次下載 | 10積分

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針對海洋中投棄式儀器的快速響應(yīng)高精度測溫要求，提出了一種基于AD7799的熱敏電阻測溫設(shè)計方案。該方案采用24位Δ-∑高精度A/D轉(zhuǎn)換器AD7799為核心部件，以高靈敏度負(fù)溫度系數(shù)熱敏電阻為溫度傳感器，MSP430 單片機(jī)為MCU，實現(xiàn)了系統(tǒng)的數(shù)字化；通過多點校準(zhǔn)插值的方法使系統(tǒng)獲得測溫高精度。經(jīng)過大量實驗證明該系統(tǒng)工作穩(wěn)定，可靠性高。實驗數(shù)據(jù)表明系統(tǒng)的分辨率超過0.001 ℃，測溫精度可達(dá)0.02 ℃。

Abstract:: ?Aiming at the requirement of fast-response high-precision temperature of ocean expendable probe， this paper presented a design scheme of thermistor temperature measurement based on AD7799. The system took 24-bit Δ-∑ ADC AD7799 as the core， NTC （Negative Temperature Coefficient） thermistor as temperature sensor， and MSP430 microcontroller as MCU， which realized system digitalization. Using multi-points calibration and interpolation method， the system realized high-accurate temperature measurement. The experiments in the laboratory and South China Sea show that the system possesses stable operation and high reliability. The experiment results show that the measurement resolution exceeds 0.001℃ and the measurement accuracy is 0.02℃.

AD7799

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