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供應德國FESTO傳感器,費斯托壓力傳感器


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供應德國FESTO傳感器,費斯托壓力傳感器

實際應用 
                                力學傳感器的種類繁多,如電阻應變片壓力傳感器、半導體應變片壓力傳感器、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。但應用的是壓阻式壓力傳感器,它具有極低的價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,我們首先認識一下電阻應變片這種元件。電阻應變片是一種將被測件上的應變變化轉(zhuǎn)換成為一種電信號的敏感器件。它是壓阻式應變傳感器的主要組成部分之一。電阻應變片應用zui多的是金屬電阻應變片和半導體應變片兩種。金屬電阻應變片又有絲狀應變片和金屬箔狀應變片兩種。通常是將應變片通過特殊的粘和劑緊密的粘合在產(chǎn)生力學應變基體上,當基體受力發(fā)生應力變化時,電阻應變片也一起產(chǎn)生形變,使應變片的阻值發(fā)生改變,從而使加在電阻上的電壓發(fā)生變化。這種應變片在受力時產(chǎn)生的阻值變化通常較小,一般這種應變片都組成應變電橋,并通過后續(xù)的儀表放大器進行放大,再傳輸給處理電路(通常是A/D
                                轉(zhuǎn)換和CPU )顯示或執(zhí)行機構(gòu)。
                                  醫(yī)學常用的壓力參數(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)的測量內(nèi)容是血壓(Blood
                                Pressure
                                ,BP)。醫(yī)學上測量的血壓有動脈壓、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。當人的心臟收縮時,動脈內(nèi)的壓力zui高,此時內(nèi)壁的壓力稱為收縮壓,亦稱高壓;心室舒張時,主動脈壓下降,在心舒末期動脈血壓的zui低值稱為舒張壓,也稱為低壓。血壓的測量,就是采用某種方法檢測和記錄血壓的收縮壓、舒張壓等數(shù)e
                                以及測量血壓的動態(tài)變化。血壓的數(shù)值一艙表示為壓力與大氣壓之差。血壓測量的壓力范圍為 0 ~
                                300mmHg。皿壓測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、壓力計和聽診5B等部分組成肋脈K
                                計,間接測量人體的收縮壓和舒張壓。與此同時在心血管功能檢查、病人監(jiān)護、生理實驗、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,盡管這種儀器十分的準確,技術十分成熟,但是仍存在諸如攜帶不方便,讀數(shù)困難,患者基本不能自測等弊病。德國的赫曼腕式血壓計,通過大規(guī)模集成電路,通過往腕帶中充氣加壓,再通過傳感器使得壓力信號轉(zhuǎn)化成為電信號,這樣不僅大大縮小了總體積,還配上一個脈搏傳感器,就可以在測量血壓的同時完成測量心跳,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。

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

                                  式中:ρ——金屬導體的電阻率(Ω。cm2/m )
                                  S ——導體的截面積(cm2 )
                                  L ——導體的長度(m )
                                  我們以金屬絲應變電阻為例,當金屬絲受外力作用時,其長度和截面積都會發(fā)生變化,
                                從上式中可很容易看出,其電阻值即會發(fā)生改變,假如金屬絲受外力作用而伸長時,其長度
                                  增加,而截面積減少,電阻值便會增大。當金屬絲受外力作用而壓縮時,長度減小而截面增
                                  加,電阻值則會減小。只要測出加在電阻的變化(通常是測量電阻兩端的電壓),即可獲得:
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供應德國FESTO傳感器,費斯托壓力傳感器

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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