【正文】 電感傳感器的接口電路設(shè)計(jì)摘要：位移測(cè)量具有廣泛應(yīng)用，電感式傳感器以其結(jié)構(gòu)簡(jiǎn)單可靠、輸出功率大、線性好、抗干擾和穩(wěn)定性好、價(jià)格低廉等特點(diǎn)獲得了大量的應(yīng)用。針對(duì)目前電感式位移傳感器的應(yīng)用現(xiàn)狀，在對(duì)電感式直線位移傳感器深入分析的基礎(chǔ)上，本文設(shè)計(jì)了一種電感式位移傳感器接口電路。該電路采用電感傳感器把被測(cè)位移量轉(zhuǎn)變?yōu)槲⑷蹼娦盘?hào)，經(jīng)前置交流放大、相敏整流，直流放大，A/D 轉(zhuǎn)換等電路處理后，送入單片機(jī)進(jìn)行綜合運(yùn)算處理后輸出，并通過液晶顯示結(jié)果，可以適應(yīng)不同量程和分辨率的信號(hào)調(diào)理要求。文中介紹了整體電路的設(shè)計(jì)和單片機(jī)系統(tǒng)的硬件及軟件流程。設(shè)計(jì)過程中用 Protel99 SE 對(duì)電路原理圖進(jìn)行了繪制，選用了單片機(jī)的開發(fā)工具 Keil C51μvision2 對(duì)軟件設(shè)計(jì)中的程序進(jìn)行編寫、編譯、模擬仿真，電路正常，完成了課題要求的電感傳感器對(duì)位移測(cè)量并顯示結(jié)果。關(guān)鍵詞：位移測(cè)量；電感式傳感器；單片機(jī)；液晶顯示The Design of the Inductive Sensor Interface CircuitAbstract: the measurement of diaspacement is very important in engineering. Inductive transducers are widely used due to their simple structures,high output capacities,good linearity,good disturbance resistance,good stability and low on thoroughly analysis of linear inductive displacement transducers,a inductive displacement transducer interface circuit is designed in this thesis.This metering circuit uses the inductive transceiver to transform that the displacement offset into the weak electrical signal, after the pre AC amplification, the phasesensitive rectifier,the DC Larger and the A / D conversion circuit processing, output after processing in the monolithic integrated circuit and display the results through the LCD. It can adapt to different range and resolution of the signal conditioning requirements. In the process of designing, Protel99SE is used to plot schematic diagram, Keil C51μvision2 and the development kit of MCU is used to pile, translate and make simulation about the assemble program. The circuit is in gear and it basically can acplish the task of measure of the displacement offset through the inductive sensor and dispiay the result.Keywords: the measurement of displacement；the inductive sensor；MCU；LCD目 錄1 緒論 ..................................................................................................................................1 本文的課題背景及意義 ............................................................................................1 課題的研究現(xiàn)狀 ........................................................................................................1 課題研究方法 ............................................................................................................4 本課題的主要研究?jī)?nèi)容 ............................................................................................42 電感傳感器 ......................................................................................................................5 電感傳感器的介紹 ....................................................................................................5 電感傳感器的工作原理 ........................................................................................5 電感傳感器的輸出特性 ........................................................................................7 電感傳感器測(cè)量電路 ............................................................................................9 電感式傳感器的等效電路 .............................................................................9 交流電橋式測(cè)量電路 ....................................................................................9 變壓器式交流電橋 .......................................................................................11 諧振式測(cè)量電路 ..........................................................................................113 電感傳感器接口電路的設(shè)計(jì) ........................................................................................13 電感傳感器接口電路的設(shè)計(jì)框圖 ..........................................................................13 電感傳感器接口電路的原理圖、工作原理及其功能 ..........................................14 振蕩器電路設(shè)計(jì)及其說明 ......................................................................................15 電感三點(diǎn)式振蕩器原理的介紹 .......................................................................15 振蕩器電路在本系統(tǒng)中的設(shè)計(jì) .......................................................................16 相敏檢波電路設(shè)計(jì)及其說明 ..................................................................................17 相敏檢波電路原理的介紹 ...............................................................................17 相敏檢波電路在本系統(tǒng)中的設(shè)計(jì) ...................................................................19 交直流放大部分的設(shè)計(jì)及其說明 ..........................................................................20 反相比例放大電路的原理 ...............................................................................21 交流放大電路在本系統(tǒng)中的設(shè)計(jì) ...................................................................21 直流放大電路在本系統(tǒng)中的設(shè)計(jì) ...................................................................22 A/D 轉(zhuǎn)換單片機(jī)控制和液晶顯示部分的設(shè)計(jì) ......................................................22 A/D 轉(zhuǎn)換電路 ..................................................................................................23 單片機(jī)部分 .......................................................................................................28 液晶顯示部分 ...................................................................................................28 通訊模塊 ...........................................................................................................32 量程變換電路的設(shè)計(jì)原理圖及其說明 ..................................................................32 電源部分的設(shè)計(jì) ......................................................................................................344 軟件系統(tǒng)的分析與設(shè)計(jì) ................................................................................................35 軟件編程語言的種類及區(qū)別 ..................................................................................35 編譯環(huán)境的介紹 ......................................................................................................35 Keil C51 簡(jiǎn)介 ...................................................................................................35 μVision2 集成開發(fā)環(huán)境 ...................................................................................36 Keil C51 的使用 ...............................................................................................37 軟件設(shè) 計(jì)流程圖 ...........................................