基于FPGA的高精度S型熱電偶溫度測量系統(tǒng)設(shè)計(jì)
2022年電子技術(shù)應(yīng)用第2期
王樂群1,,文 豐1,,2,張凱華1
1.中北大學(xué) 電子測試技術(shù)國家重點(diǎn)實(shí)驗(yàn)室,,山西 太原030051; 2.中北大學(xué) 儀器科學(xué)與動(dòng)態(tài)測試教育部重點(diǎn)實(shí)驗(yàn)室,,山西 太原030051
摘要: 針對傳統(tǒng)的多通道S型熱電偶測溫系統(tǒng)測量精度低,、各通道精度相差較大的問題,提出了一種以FPGA為核心的高精度S型熱電偶測溫系統(tǒng),。系統(tǒng)以FPGA為核心控制器,,采用模塊化設(shè)計(jì),,利用AD590溫度傳感器對S型熱電偶進(jìn)行冷端補(bǔ)償。采用多通道采集,、單通道調(diào)理的設(shè)計(jì)方法以改善由于元器件差異引起的各通道精度相差較大的情況,。同時(shí)選用高精度ADC將采集的溫度模擬信號轉(zhuǎn)換為數(shù)字信號傳輸?shù)缴衔粰C(jī)顯示,上位機(jī)通過查表法準(zhǔn)確定位溫度值,,提高測溫精度,。經(jīng)過多次試驗(yàn)驗(yàn)證,該測溫系統(tǒng)溫度采集精度優(yōu)于0.2%F.S.,。目前該系統(tǒng)已經(jīng)應(yīng)用到工程實(shí)踐中,,為多通道S型熱電偶測溫系統(tǒng)設(shè)計(jì)提供了有效、可靠的手段,。
中圖分類號: TP274
文獻(xiàn)標(biāo)識(shí)碼: A
DOI:10.16157/j.issn.0258-7998.211896
中文引用格式: 王樂群,,文豐,張凱華. 基于FPGA的高精度S型熱電偶溫度測量系統(tǒng)設(shè)計(jì)[J].電子技術(shù)應(yīng)用,,2022,,48(2):41-45.
英文引用格式: Wang Lequn,Wen Feng,,Zhang Kaihua. Design of temperature measuring circuit of S-type thermocouple based on temperature sensor[J]. Application of Electronic Technique,,2022,48(2):41-45.
文獻(xiàn)標(biāo)識(shí)碼: A
DOI:10.16157/j.issn.0258-7998.211896
中文引用格式: 王樂群,,文豐,張凱華. 基于FPGA的高精度S型熱電偶溫度測量系統(tǒng)設(shè)計(jì)[J].電子技術(shù)應(yīng)用,,2022,,48(2):41-45.
英文引用格式: Wang Lequn,Wen Feng,,Zhang Kaihua. Design of temperature measuring circuit of S-type thermocouple based on temperature sensor[J]. Application of Electronic Technique,,2022,48(2):41-45.
Design of temperature measuring circuit of S-type thermocouple based on temperature sensor
Wang Lequn1,,Wen Feng1,,2,Zhang Kaihua1
1.State Key Laboratory of Electronic Testing Technology,,North University of China,,Taiyuan 030051,China,; 2.Key Laboratory of Instrument Science and Dynamic Testing,,Ministry of Education,North University of China,,Taiyuan 030051,,China
Abstract: Aiming at the problem that the traditional multi-channel S-type thermocouple temperature measurement system has low measurement accuracy and each channel is quite different, a high-precision S-type thermocouple temperature measurement system based on FPGA is proposed.The system uses FPGA as controller, with modular design, and uses AD590 to perform cold junction compensation for S-type thermocouples.A high-precision ADC is used to convert the collected temperature analog signal into a digital signal and transmit it to the upper computer for display and locates the temperature value through the look-up table method to improve the temperature measurement accuracy.After many tests, it is verified that the temperature acquisition accuracy of this temperature measurement circuit is better than 0.2%F.S. At present, the circuit design has been applied to engineering practice, which provides an effective and reliable means for the design of temperature measuring circuit of S-type thermocouple.
Key words : S-type thermocouple;FPGA,;cold end compensation,;RFI filter circuit;high precision
0 引言
在某些特殊測試中,,經(jīng)常需要監(jiān)視關(guān)鍵設(shè)備的環(huán)境因素,,而溫度作為環(huán)境因素中的重要參數(shù),直接決定測試的成敗[1],因此測量溫度的精度就顯的尤為重要,。在要求高溫測量時(shí),,S型熱電偶可以達(dá)到0~1 600 ℃的測量溫度范圍,滿足大部分測量溫度的需求,。因此,,提高S型熱電偶在試驗(yàn)中溫度采集的精度是有必要的。
本文提出了一種以FPGA為控制核心的高精度S型熱電偶測量系統(tǒng),。核心控制器完成模擬開關(guān)選通以及高精度ADC完成模數(shù)轉(zhuǎn)換,。同時(shí)使用多通道采集,,單通道調(diào)理的設(shè)計(jì)方法改善由于元器件差異而導(dǎo)致的各路精度不一致的情況,。上位機(jī)通過使用查表法來更精確地確定溫度值,以此提高熱電偶測溫系統(tǒng)的精度[2],。經(jīng)過多次試驗(yàn)測試,,驗(yàn)證了該系統(tǒng)的可靠性。
本文詳細(xì)內(nèi)容請下載:http://forexkbc.com/resource/share/2000003965,。
作者信息:
王樂群1,,文 豐1,2,,張凱華1
(1.中北大學(xué) 電子測試技術(shù)國家重點(diǎn)實(shí)驗(yàn)室,,山西 太原030051;
2.中北大學(xué) 儀器科學(xué)與動(dòng)態(tài)測試教育部重點(diǎn)實(shí)驗(yàn)室,,山西 太原030051)
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