基于單片機(jī)的K型熱電偶冷端自動(dòng)補(bǔ)償設(shè)計(jì)

汪定江 王東鋒 楊后川
空軍第一航空學(xué)院,河南信陽(yáng)464000摘　要:以單片機(jī)強(qiáng)大的數(shù)據(jù)處理功能為基礎(chǔ)，以試驗(yàn)數(shù)據(jù)的擬合而不是理想集成運(yùn)放的計(jì)算公式為測(cè)量依據(jù)，提出了檢測(cè)環(huán)境電勢(shì)和現(xiàn)場(chǎng)電勢(shì)的新方法，并根據(jù)兩者之和即為熱電偶標(biāo)準(zhǔn)電勢(shì)這一基本依據(jù)，設(shè)計(jì)了熱電偶冷端自動(dòng)補(bǔ)償系統(tǒng)的硬件及相關(guān)軟件。由于采用了軟件對(duì)各電勢(shì)信號(hào)處理．大大簡(jiǎn)化了傳統(tǒng)補(bǔ)償電路，使硬件設(shè)計(jì)僅包括環(huán)境溫度測(cè)量、現(xiàn)場(chǎng)電勢(shì)測(cè)量及單片機(jī)的信號(hào)處理三個(gè)模塊，并且顯著降低了成本。仿真及試驗(yàn)結(jié)果表明，本補(bǔ)償系統(tǒng)可使控溫最大偏差〈5℃。[著者文摘]

Design of Cold End Self-motion Compensation of K Thermal Couple on the Basis of Single ChipWANG Ding-Jiang, WANG Dong-Feng, YANG Hou-Chuan The First Aeronautic Institute of Air Force, Xinyang Henan 464000, China Abstract:On the basis of strong function of processing data by single chip a new method of testing environmental voltage and local voltage was presented in this paper, the measuring foundation of which is simulation of experimental but not ideal formula. The design of the com- pensation system was based on the fact： the sum of two voltage is the standard voltage. Because software was used to process voltage sign, the circuit was simplified evidently. The whole design include only three part, i.e. environmental temperature testing, local voltage testing and sign processing of single chip. Meanwhile, the cost decreased remarkably. The results of emulation and experiment show that, the compensation system can make the maximum error less than 5℃.[著者文摘]

Key words:K thermal couple; cold end compensation; single chip; hot end temperature