醫(yī)用紅外測溫儀及溫度補償技術(shù)的研究(已修改)
2025-01-29 22:58 本頁面
【正文】 醫(yī)用紅外測溫儀及溫度補償技術(shù)的研究摘 要紅外測溫是目前最主要的非接觸式測溫方式之一。它具有響應(yīng)速度快、測量范圍寬、靈敏度高等優(yōu)點，因而被廣泛應(yīng)用于各行各業(yè)?！妗嬷g，精度要求為177?！?。但目前使用的紅外測溫儀即使其精確度指標為1%，也遠遠達不到測量體溫的精度要求。另外，℃℃的溫度范圍內(nèi)，紅外測溫儀的測量精度很容易受外界環(huán)境溫度的影響，導(dǎo)致其測量誤差增大。同時紅外測溫儀的精度和穩(wěn)定性很容易受到外界環(huán)境溫度的影響。因此，減小外界環(huán)境因素對紅外測溫儀的影響具有十分重要的意義。本設(shè)計針對目前醫(yī)用紅外測溫儀的現(xiàn)狀，在查閱了大量國內(nèi)外文獻的基礎(chǔ)上，提出了一種新的環(huán)境溫度的補償方法。這種方法是根據(jù)熱釋電探測器的工作原理，以及被測物體與環(huán)境溫度的差值作為參考量，根據(jù)其差值的大小確定補償量的多少。通過數(shù)字測溫芯片測量環(huán)境溫度，采用軟件補償?shù)姆绞?，避免了以往用熱敏電阻的缺點。在紅外測溫系統(tǒng)中，紅外信號經(jīng)過光學(xué)系統(tǒng)的匯聚、斬波器的調(diào)制和熱釋電探測器的接收后轉(zhuǎn)變成頻率為20 Hz的脈沖信號。此信號經(jīng)過放大、濾波、整形和A/D轉(zhuǎn)換成數(shù)字信號，再送到單片機中進行數(shù)據(jù)的處理、補償和顯示。在系統(tǒng)的設(shè)計過程中，采用Wave6000單片機仿真系統(tǒng)對單片機進行調(diào)試。為了保持各部分之間正確的時序關(guān)系，軟件全部采用匯編語言來編寫。系統(tǒng)經(jīng)過定標和測試表明：本系統(tǒng)在測量的精度和穩(wěn)定性上有所提高。關(guān)鍵詞 紅外測溫儀；熱釋電探測器；發(fā)射率；溫度補償；單片機；定標AbstractAs a main way of noncontact measurement,infrared measurement has many advantages,such as rapid reaction,wide measurement range and high sensitivity ,noncontact thermometry can be used in variety of infrared thermometer is used in medicine,The range of infrared thermometer is regulated between ℃to ℃and its precision must be ℃when it is used in most of infrared thermometer couldn’t achieve this ,in this temperature range,the precision of infrared thermometer can be greatly affected by ambient error will increased greatly too.After looked up lots of data and realized the defect of infrared thermometer in medicinal scopes,a new pensatory way on environmental temperature is presented in this new way bases on the principle of pyroelectric detector and defines the quantity of pensation according to the temperature difference between target and its ambient temperature is measured by a digital chip and processed with new way can overe the defect of thermal resistance.After focused by lens,chopped by chopper and received by detector, infrared signal is transformed to electric signal whose frequency is 20 Hz in this infrared electric signal is processed,pensated and displayed in microcontroller system after it is amplified,filtered and adjusted by circuit. During design of this infrared system,microcontrol is debugged with Wave6000 simulation system and software is piled in assembly language because of timing relation between every test of this infrared thermometer indicates that precision and stability has improved it couldn’t reach our country’s standards on medicinal Keywords Infrared thermometer。Pyroelectric detector。Emissivity。Temperature pensation。Microcontroller。Calibration 目 錄摘要IAbstractII第1章 緒論1 引言1 紅外測溫儀的分類 2 全輻射測溫儀2 單色測溫儀3 比色測溫儀4 發(fā)射率和環(huán)境因素對紅外測溫儀的影響5 發(fā)射率對紅外測溫儀的影響5 環(huán)境因素對紅外測溫儀的影響6 醫(yī)用紅外測溫儀的現(xiàn)狀7 課題的意義和內(nèi)容8 課題的意義8 課題的內(nèi)容8第2章 光學(xué)系統(tǒng)和光電轉(zhuǎn)換9 紅外測溫儀的光學(xué)系統(tǒng)9 紅外測溫儀光學(xué)系統(tǒng)特點9 常用紅外光學(xué)系統(tǒng)結(jié)構(gòu)9 紅外光學(xué)系統(tǒng)設(shè)計12 透鏡成像公式13 透鏡成像的誤差及對策14 透鏡參數(shù)的確定14 光電轉(zhuǎn)換15 紅外探測器的種類15 熱釋電探測器25 本章小結(jié)27第3章 電路系統(tǒng)設(shè)計28 紅外信號的調(diào)制
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