供應(yīng)德國(guó)FESTO傳感器,費(fèi)斯托壓力傳感器

實(shí)際應(yīng)用　
                                力學(xué)傳感器的種類繁多，如電阻應(yīng)變片壓力傳感器、半導(dǎo)體應(yīng)變片壓力傳感器、壓阻式壓力傳感器、電感式壓力傳感器、電容式壓力傳感器、諧振式壓力傳感器及電容式加速度傳感器等。但應(yīng)用的是壓阻式壓力傳感器，它具有極低的價(jià)格和較高的精度以及較好的線性特性。下面我們主要介紹這類傳感器。[1]
                                　　在了解壓阻式力傳感器時(shí)，我們首先認(rèn)識(shí)一下電阻應(yīng)變片這種元件。電阻應(yīng)變片是一種將被測(cè)件上的應(yīng)變變化轉(zhuǎn)換成為一種電信號(hào)的敏感器件。它是壓阻式應(yīng)變傳感器的主要組成部分之一。電阻應(yīng)變片應(yīng)用zui多的是金屬電阻應(yīng)變片和半導(dǎo)體應(yīng)變片兩種。金屬電阻應(yīng)變片又有絲狀應(yīng)變片和金屬箔狀應(yīng)變片兩種。通常是將應(yīng)變片通過(guò)特殊的粘和劑緊密的粘合在產(chǎn)生力學(xué)應(yīng)變基體上，當(dāng)基體受力發(fā)生應(yīng)力變化時(shí)，電阻應(yīng)變片也一起產(chǎn)生形變，使應(yīng)變片的阻值發(fā)生改變，從而使加在電阻上的電壓發(fā)生變化。這種應(yīng)變片在受力時(shí)產(chǎn)生的阻值變化通常較小，一般這種應(yīng)變片都組成應(yīng)變電橋，并通過(guò)后續(xù)的儀表放大器進(jìn)行放大，再傳輸給處理電路（通常是A/D
                                轉(zhuǎn)換和CPU ）顯示或執(zhí)行機(jī)構(gòu)。
                                　　醫(yī)學(xué)常用的壓力參數(shù)有：血壓、顱內(nèi)壓、眼內(nèi)壓、腸內(nèi)壓、肺泡壓等，其中zui常規(guī)的測(cè)量?jī)?nèi)容是血壓（Blood
                                Pressure
                                ,BP）。醫(yī)學(xué)上測(cè)量的血壓有動(dòng)脈壓、靜脈壓和心內(nèi)壓（包括心室壓、心房壓）等，每種壓力信號(hào)又包括：收縮壓、舒張壓、平均壓。

                                　　血管內(nèi)的血液在血管壁單位面積上垂直作用的力，稱為血壓。當(dāng)人的心臟收縮時(shí)，動(dòng)脈內(nèi)的壓力zui高，此時(shí)內(nèi)壁的壓力稱為收縮壓，亦稱高壓；心室舒張時(shí)，主動(dòng)脈壓下降，在心舒末期動(dòng)脈血壓的zui低值稱為舒張壓，也稱為低壓。血壓的測(cè)量，就是采用某種方法檢測(cè)和記錄血壓的收縮壓、舒張壓等數(shù)e
                                以及測(cè)量血壓的動(dòng)態(tài)變化。血壓的數(shù)值一艙表示為壓力與大氣壓之差。血壓測(cè)量的壓力范圍為 0 ～
                                300mmHg。皿壓測(cè)量的頻串范圍通常為 0
                                ～20Hz。在常規(guī)的臨床檢查中，常常采用人工方式，使用由氣袖、壓力計(jì)和聽(tīng)診5B等部分組成肋脈K
                                計(jì)，間接測(cè)量人體的收縮壓和舒張壓。與此同時(shí)在心血管功能檢查、病人監(jiān)護(hù)、生理實(shí)驗(yàn)、以及體格檢查中，廣泛使用帶有各種血壓傳感器的電血壓計(jì)，盡管這種儀器十分的準(zhǔn)確，技術(shù)十分成熟，但是仍存在諸如攜帶不方便，讀數(shù)困難，患者基本不能自測(cè)等弊病。德國(guó)的赫曼腕式血壓計(jì)，通過(guò)大規(guī)模集成電路，通過(guò)往腕帶中充氣加壓，再通過(guò)傳感器使得壓力信號(hào)轉(zhuǎn)化成為電信號(hào)，這樣不僅大大縮小了總體積，還配上一個(gè)脈搏傳感器，就可以在測(cè)量血壓的同時(shí)完成測(cè)量心跳，單位換算等諸多功能，十分方便，為患者自行診斷提供了可能。

                                電阻應(yīng)變片的工作原理
                                　　金屬電阻應(yīng)變片的工作原理是吸附在基體材料上應(yīng)變電阻隨機(jī)械形變而產(chǎn)生阻值變化的現(xiàn)象，俗稱為電阻應(yīng)變效應(yīng)。金屬導(dǎo)體的電阻值可用下式表示：

                                　　式中：ρ——金屬導(dǎo)體的電阻率（Ω。cm2/m ）
                                　　S ——導(dǎo)體的截面積（cm2 ）
                                　　L ——導(dǎo)體的長(zhǎng)度（m ）
                                　　我們以金屬絲應(yīng)變電阻為例，當(dāng)金屬絲受外力作用時(shí)，其長(zhǎng)度和截面積都會(huì)發(fā)生變化，
                                從上式中可很容易看出，其電阻值即會(huì)發(fā)生改變，假如金屬絲受外力作用而伸長(zhǎng)時(shí)，其長(zhǎng)度
                                　　增加，而截面積減少，電阻值便會(huì)增大。當(dāng)金屬絲受外力作用而壓縮時(shí)，長(zhǎng)度減小而截面增
                                　　加，電阻值則會(huì)減小。只要測(cè)出加在電阻的變化（通常是測(cè)量電阻兩端的電壓），即可獲得：
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供應(yīng)德國(guó)FESTO傳感器,費(fèi)斯托壓力傳感器

LF-1/8-D-MINI
                                LF-1/4-D-MINI
                                LF-3/4-D-MAXI
                                LF-1-D-MAXI
                                LF-1/8-D-MINI-A
                                LF-1/4-D-MINI-A
                                LF-3/4-D-MAXI-A
                                LF-1-D-MAXI-A
                                LF-3/8-D-MINI
                                LF-3/4-D-MIDI
                                LF-3/8-D-MINI-A
                                LF-3/4-D-MIDI-A
                                LF-1/8-D-5M-MINI
                                LF-1/4-D-5M-MINI
                                LF-3/8-D-5M-MINI
                                LF-3/8-D-5M-MIDI
                                LF-1/2-D-5M-MIDI
                                LF-3/4-D-5M-MIDI
                                LF-3/4-D-5M-MAXI
                                LF-1-D-5M-MAXI
                                LF-1/8-D-5M-MINI-A
                                LF-1/4-D-5M-MINI-A
                                LF-3/8-D-5M-MINI-A
                                LF-3/8-D-5M-MIDI-A
                                LF-1/2-D-5M-MIDI-A
                                LF-3/4-D-5M-MIDI-A
                                LF-3/4-D-5M-MAXI-A
                                LF-1-D-5M-MAXI-A
                                LF-1/8-D-MINI-NPT
                                LF-1/8-D-MINI-A-NPT
                                LF-1/8-D-5M-MINI-NPT
                                LF-1/8-D-5M-MINI-A-NPT
                                LF-1/4-D-MINI-NPT
                                LF-1/4-D-MINI-A-NPT
                                LF-1/4-D-5M-MINI-NPT
                                LF-1/4-D-5M-MINI-A-NPT
                                LF-3/8-D-MINI-NPT
                                LF-3/8-D-MINI-A-NPT
                                LF-3/8-D-5M-MINI-NPT
                                LF-3/8-D-5M-MINI-A-NPT
                                LF-3/8-D-MIDI-NPT
                                LF-3/8-D-MIDI-A-NPT
                                LF-3/8-D-5M-MIDI-NPT
                                LF-3/8-D-5M-MIDI-A-NPT
                                LF-1/2-D-MIDI-NPT
                                LF-1/2-D-MIDI-A-NPT
                                LF-1/2-D-5M-MIDI-NPT
                                LF-1/2-D-5M-MIDI-A-NPT
                                LF-3/4-D-MIDI-NPT
                                LF-3/4-D-MIDI-A-NPT
                                LF-3/4-D-5M-MIDI-NPT
                                LF-3/4-D-5M-MIDI-A-NPT
                                LF-3/4-D-MAXI-NPT
                                LF-3/4-D-MAXI-A-NPT
                                LF-3/4-D-5M-MAXI-NPT
                                LF-3/4-D-5M-MAXI-A-NPT
                                LF-1-D-MAXI-NPT
                                LF-1-D-MAXI-A-NPT
                                LF-1-D-5M-MAXI-NPT
                                LF-1-D-5M-MAXI-A-NPT
                                LF-1/4-D-MIDI
                                LF-1/4-D-5M-MIDI
                                LF-1/4-D-MIDI-A
                                LF-1/4-D-5M-MIDI-A
                                LF-1/2-D-MAXI
                                LF-1/2-D-5M-MAXI
                                LF-1/2-D-MAXI-A
                                LF-1/2-D-5M-MAXI-A
                                LF-D-MINI
                                LF-D-MIDI
                                LF-D-MAXI
                                LF-D-MINI-A
                                LF-D-MIDI-A
                                LF-D-MAXI-A
                                LF-D-5M-MINI
                                LF-D-5M-MIDI
                                LF-D-5M-MAXI
                                LF-D-5M-MINI-A
                                LF-D-5M-MIDI-A
                                LF-D-5M-MAXI-A
                                LF-M5-D-5M-MICRO
                                LF-M5-D-5M-MICRO-H
                                LF-1/8-D-5M-MICRO
                                LF-1/8-D-5M-MICRO-H
                                LF-N1/8-D-5M-MICRO
                                LF-N1/8-D-5M-MICRO-H
                                LF-QS4-D-5M-MICRO
                                LF-QS4-D-5M-MICRO-H
                                LF-QS6-D-5M-MICRO
                                LF-QS6-D-5M-MICRO-H
                                LF-M7-D-5M-MICRO-B
                                LF-M7-D-5M-MICRO-H-B
                                LF-D-MIDI-U
                                LF-D-MIDI-A-U

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