【正文】 器，顯示器將顯示采集的溫度，這樣就能夠達(dá)到題目的要求，而且其準(zhǔn)確性也較高。因?yàn)閭鞲衅鞯臉?biāo)定既復(fù)雜又要求苛刻，且成本較高。它以測量精確，線性好，重復(fù)性好，測量范圍大，體積小等的點(diǎn)被用在很多場合，其中鉑電阻傳感器被定為測溫的基準(zhǔn)。之后，鉑電阻溫度計(jì)成為國際溫標(biāo)的標(biāo)準(zhǔn)儀器，并一直沿用至今。 1871 年，西門子 (Sir william Siemens)發(fā)現(xiàn)了鉑電阻測溫原理，制造出第一支鉑電阻溫度計(jì)。目錄 摘 要 .............................................................................................................................. 2 1 緒 言 .......................................................................................................................... 4 課題背景 ...............................................................................................................................................4 國內(nèi)外研究的發(fā)展及現(xiàn)狀 .................................................................................................................5 本課題研究的內(nèi)容 .............................................................................................................................8 2 總體設(shè)計(jì)方案 ................................................................................................................. 8 提出總體設(shè)計(jì)方案 .............................................................................................................................8 總體設(shè)計(jì)方案論證 ..............................................................................................................................9 3 鉑電阻理論基礎(chǔ) ............................................................................................................. 9 鉑電阻的選取 ......................................................................................................................................9 鉑電阻溫度的測量方法 ................................................................................................................... 12 4 整體電路 ..................................................................................................................... 14 放大電路設(shè)計(jì) ................................................................................................................................... 14 溫度顯示電路理論及設(shè)計(jì) .............................................................................................................. 15 AD 轉(zhuǎn)換模塊 ...................................................................................................................................... 17 AT89C51 單片機(jī)系統(tǒng)電路圖 ........................................................................................................... 18 系統(tǒng)程序設(shè)計(jì) ................................................................................................................................... 19 ...................................................................................................................... 21 總結(jié) ............................................................................................................................... 21 參考文獻(xiàn) ........................................................................................................................ 22 2 摘 要 溫度計(jì)量是計(jì)量學(xué)的一個(gè)重要分支，它在國民經(jīng)濟(jì)各領(lǐng)域中占有重要的地位。人們的日常生活、工農(nóng)業(yè)生產(chǎn)和科學(xué)實(shí)驗(yàn)等許多方面都與溫度測量有著十分密切的關(guān)系。 1887 年，卡倫德 (Hugh Callendar)改進(jìn)了鉑電阻溫度計(jì)的工藝和研制測溫電橋并得到了著名的卡倫德公式。 金屬熱電阻是 一種廣泛應(yīng)用的溫度傳感器。金屬熱電阻特別是銅、鐵等熱電阻的大量使用，將給使用者在傳感器的標(biāo)定造成重復(fù)性的麻煩。為了解決這個(gè)問題我采用了一種方便的以精密鉑電阻為標(biāo)準(zhǔn)傳感器的金屬熱電阻的來作為溫度傳感器。 關(guān)鍵字： atmega16 單片機(jī)， pt100 溫度傳感器，數(shù)碼顯示， protues Abstract Temperature metrology, a major branch of metrology, plays an important role in every field of national economy . For example, people39。s formula. From then on Callendar39。s 3 thermometer is a standard among them. Too much metal heat resistance used especially copper ,iron cause repetitive problems in demarcating the sensors. Considering its plexity, strictness and high costs, I use a convient metal heat resistance as temperature pickup,which has a precise platinum resistance as its standard sensor. In this theory, I use atmega16 as function center and pt100 as temperature pickup. As atmega16 itself has A/D transforming function, I can send it the gathered temperature directly, then atmega16 will deal with the temperature and present it on the monitor. In this way, I can fulfill this issue, and it is more accurate Key words: Atmega16, pt100 temperature pickup, Digital display, protues 1 緒 言 課題背景 二十一世紀(jì)是人類全面進(jìn)入信息電子化的時(shí)代，隨著人類探知領(lǐng)域和空間的拓展，使得人們