技術領域

本發明(ming)涉及一(yi)(yi)種傳(chuan)感器(qi)及其制(zhi)造方法(fa)，特別涉及一(yi)(yi)種用于在某一(yi)(yi)狹小接(jie)觸(chu)區域中對一(yi)(yi)點(dian)接(jie)觸(chu)物(wu)體間(jian)的壓(ya)力(li)(li)或集中力(li)(li)進行(xing)檢測的柔(rou)性單(dan)點(dian)力(li)(li)片(pian)式傳(chuan)感器(qi)及其制(zhi)造方法(fa)。

背景技術

壓力(li)(li)傳(chuan)(chuan)感(gan)器及(ji)(ji)檢測(ce)技術(shu)在航(hang)空(kong)航(hang)天(tian)、軍(jun)事工業(ye)、汽(qi)車(che)、船舶(bo)制(zhi)造、工業(ye)自(zi)動(dong)化、醫學研(yan)究(jiu)、生(sheng)物(wu)(wu)醫療等(deng)(deng)領(ling)域中(zhong)發揮著重要的(de)(de)作(zuo)用(yong)(yong)。然而在上(shang)述應用(yong)(yong)領(ling)域，許(xu)多場合需(xu)在某(mou)(mou)一(yi)狹小(xiao)空(kong)間(jian)中(zhong)對某(mou)(mou)一(yi)點接觸(chu)物(wu)(wu)體(ti)間(jian)的(de)(de)壓力(li)(li)或集中(zhong)力(li)(li)進行檢測(ce)，例如(ru)點接觸(chu)物(wu)(wu)體(ti)間(jian)在運動(dong)過程中(zhong)摩(mo)擦力(li)(li)相互作(zuo)用(yong)(yong)過程的(de)(de)研(yan)究(jiu)、例如(ru)檢測(ce)空(kong)間(jian)凸(tu)輪與滾(gun)子從(cong)動(dong)件處于點接觸(chu)狀(zhuang)態下(xia)的(de)(de)相互作(zuo)用(yong)(yong)力(li)(li)、檢測(ce)某(mou)(mou)一(yi)對牙齒嚙(nie)合時(shi)的(de)(de)相互作(zuo)用(yong)(yong)力(li)(li)等(deng)(deng)。由(you)于受到(dao)傳(chuan)(chuan)感(gan)器重量、體(ti)積以及(ji)(ji)工作(zuo)空(kong)間(jian)(如(ru)狹縫)的(de)(de)限制(zhi)，這時(shi)傳(chuan)(chuan)統壓力(li)(li)傳(chuan)(chuan)感(gan)器便(bian)(bian)不能(neng)用(yong)(yong)于上(shang)述場合下(xia)的(de)(de)使用(yong)(yong)來檢測(ce)某(mou)(mou)一(yi)點接觸(chu)物(wu)(wu)體(ti)間(jian)的(de)(de)壓力(li)(li)或集中(zhong)力(li)(li)。即便(bian)(bian)勉強(qiang)使用(yong)(yong)，也不能(neng)滿足操作(zuo)便(bian)(bian)捷的(de)(de)要求，

發明內容

本(ben)發明(ming)針對傳統壓力(li)傳感(gan)器不(bu)能對某(mou)一(yi)(yi)點(dian)接(jie)觸物體間壓力(li)進行檢測、體積(ji)大、重量(liang)(liang)(liang)重、操(cao)作(zuo)(zuo)不(bu)方便的缺(que)點(dian)；提供(gong)了一(yi)(yi)種能夠檢測出(chu)某(mou)一(yi)(yi)點(dian)接(jie)觸物體間壓力(li)的柔性(xing)單(dan)點(dian)力(li)片式傳感(gan)器，該傳感(gan)器具有(you)體積(ji)小、重量(liang)(liang)(liang)輕(qing)、制作(zuo)(zuo)簡(jian)(jian)單(dan)、可低成本(ben)批量(liang)(liang)(liang)化(hua)生產(chan)的特點(dian)，并(bing)且可重復使用、操(cao)作(zuo)(zuo)簡(jian)(jian)便。

本發明的(de)另一(yi)個目的(de)是提供一(yi)種(zhong)該(gai)傳(chuan)感器的(de)制造方(fang)法(fa)。

為(wei)達到上述目的，本發明是(shi)采取如下技術(shu)方(fang)案(an)予以(yi)實現的：

一(yi)種柔性單點力片(pian)式傳感器，包(bao)括壓(ya)(ya)敏(min)(min)體(ti)、分別設(she)置在壓(ya)(ya)敏(min)(min)體(ti)上(shang)下端(duan)面(mian)的(de)(de)兩(liang)(liang)個電(dian)(dian)(dian)極(ji)(ji)連接(jie)片(pian)，其特(te)征在于，還包(bao)括有形狀(zhuang)大小(xiao)相同(tong)的(de)(de)上(shang)基(ji)板(ban)和下基(ji)板(ban)，上(shang)、下基(ji)板(ban)之間(jian)由粘接(jie)層封(feng)接(jie)；在上(shang)基(ji)板(ban)長(chang)度(du)方向的(de)(de)一(yi)側設(she)置有一(yi)凸(tu)(tu)(tu)起(qi)；在相對該凸(tu)(tu)(tu)起(qi)的(de)(de)下基(ji)板(ban)上(shang)設(she)置有一(yi)凹(ao)陷(xian)(xian)，該凹(ao)陷(xian)(xian)與所(suo)述凸(tu)(tu)(tu)起(qi)之間(jian)形成(cheng)一(yi)個密(mi)閉的(de)(de)壓(ya)(ya)敏(min)(min)體(ti)室，其中封(feng)裝有所(suo)述的(de)(de)壓(ya)(ya)敏(min)(min)體(ti)及電(dian)(dian)(dian)極(ji)(ji)連接(jie)片(pian)，所(suo)述壓(ya)(ya)敏(min)(min)體(ti)室的(de)(de)大小(xiao)剛好(hao)與壓(ya)(ya)敏(min)(min)體(ti)的(de)(de)大小(xiao)吻(wen)合；所(suo)述下基(ji)板(ban)1沿其長(chang)度(du)方向設(she)置有兩(liang)(liang)條相互平(ping)行(xing)的(de)(de)印刷(shua)電(dian)(dian)(dian)極(ji)(ji)6，每(mei)個印刷(shua)電(dian)(dian)(dian)極(ji)(ji)分別連接(jie)位于壓(ya)(ya)敏(min)(min)體(ti)上(shang)或下端(duan)面(mian)的(de)(de)電(dian)(dian)(dian)極(ji)(ji)連接(jie)片(pian)9和伸出下基(ji)板(ban)的(de)(de)電(dian)(dian)(dian)極(ji)(ji)引出片(pian)3；所(suo)述下基(ji)板(ban)上(shang)的(de)(de)兩(liang)(liang)條印刷(shua)電(dian)(dian)(dian)極(ji)(ji)6從(cong)連接(jie)電(dian)(dian)(dian)極(ji)(ji)連接(jie)片(pian)9到連接(jie)電(dian)(dian)(dian)極(ji)(ji)引出片(pian)3一(yi)段的(de)(de)上(shang)表面(mian)設(she)置有電(dian)(dian)(dian)極(ji)(ji)保護膜。

一種上述(shu)柔(rou)性單點力片式傳感器的制造方法，其特征在(zai)于，包括如(ru)下(xia)步驟：

a.先制備(bei)形狀(zhuang)大小相(xiang)同(tong)的(de)上(shang)基板(ban)和下基板(ban)，在上(shang)基板(ban)長度方向(xiang)的(de)一(yi)(yi)側(ce)設置(zhi)一(yi)(yi)凸起；在相(xiang)對該凸起的(de)下基板(ban)上(shang)設置(zhi)一(yi)(yi)凹陷；

b.將下基板(ban)1固定在絲網印(yin)刷機的(de)(de)印(yin)刷臺(tai)上，用導電料漿沿下基板(ban)長(chang)度方向從遠離凹陷一側到凹陷的(de)(de)上表(biao)面印(yin)制(zhi)兩(liang)條(tiao)印(yin)刷電極，干燥后，在下基板(ban)遠離凹陷的(de)(de)一側設置(zhi)兩(liang)個外露的(de)(de)電極引出片(pian)3。

c.在下(xia)基板(ban)(ban)凹陷中涂敷(fu)壓(ya)(ya)敏(min)電(dian)(dian)阻油(you)墨，并放(fang)置一(yi)個壓(ya)(ya)敏(min)體(ti)，該壓(ya)(ya)敏(min)體(ti)上(shang)、下(xia)端(duan)(duan)面(mian)事先分別焊接(jie)(jie)(jie)好兩(liang)(liang)(liang)個電(dian)(dian)極(ji)(ji)連(lian)接(jie)(jie)(jie)片(pian)9，位于壓(ya)(ya)敏(min)體(ti)上(shang)、下(xia)端(duan)(duan)面(mian)的(de)兩(liang)(liang)(liang)電(dian)(dian)極(ji)(ji)連(lian)接(jie)(jie)(jie)片(pian)9分別連(lian)接(jie)(jie)(jie)至位于下(xia)基板(ban)(ban)上(shang)的(de)兩(liang)(liang)(liang)條印(yin)刷電(dian)(dian)極(ji)(ji)6的(de)一(yi)端(duan)(duan)，兩(liang)(liang)(liang)條印(yin)刷電(dian)(dian)極(ji)(ji)6的(de)另一(yi)端(duan)(duan)連(lian)接(jie)(jie)(jie)外露的(de)兩(liang)(liang)(liang)個電(dian)(dian)極(ji)(ji)引出片(pian)3；同時，在上(shang)基板(ban)(ban)4的(de)凸起(qi)內表(biao)面(mian)上(shang)涂敷(fu)壓(ya)(ya)敏(min)電(dian)(dian)阻油(you)墨。

d.在下基板的(de)兩條印刷(shua)電(dian)(dian)極6上從連接電(dian)(dian)極連接片(pian)(pian)9到連接電(dian)(dian)極引(yin)出片(pian)(pian)3的(de)一(yi)段上表面涂敷一(yi)層電(dian)(dian)極保護(hu)膜(mo)并干燥(zao)。

e.將上、下基板用粘接層復合，使所述(shu)凸起與凹陷之間形(xing)成一個的(de)密(mi)閉壓敏(min)(min)體(ti)室(shi)，將壓敏(min)(min)體(ti)及電極連接片封裝在其內，壓敏(min)(min)體(ti)室(shi)的(de)大小(xiao)剛好與壓敏(min)(min)體(ti)的(de)大小(xiao)吻合，同(tong)時(shi)兩(liang)條印刷電極相互(hu)平行。

以上(shang)方法中，所(suo)述(shu)的印刷電(dian)極用導電(dian)漿料(liao)(liao)為銀導電(dian)漿料(liao)(liao)；所(suo)述(shu)的電(dian)極保護膜材料(liao)(liao)采用羥乙(yi)基纖維素；所(suo)述(shu)的壓敏(min)電(dian)阻油(you)墨采用碳二(er)硫化(hua)鉬油(you)墨；所(suo)述(shu)的上(shang)、下基板(ban)采用聚氯乙(yi)烯材料(liao)(liao)制成(cheng)矩(ju)形基片；所(suo)述(shu)的粘接層采用環氧樹脂。

本發明(ming)的(de)(de)(de)柔(rou)性(xing)單(dan)(dan)點(dian)力(li)(li)片式傳感器不需(xu)(xu)要外(wai)(wai)加保護裝(zhuang)置，不用將(jiang)壓敏電(dian)阻直接(jie)(jie)置入被測對象(xiang)內部，只需(xu)(xu)將(jiang)被測對象(xiang)的(de)(de)(de)點(dian)接(jie)(jie)觸(chu)部位與壓敏電(dian)阻所(suo)對應的(de)(de)(de)壓敏體室的(de)(de)(de)聚(ju)(ju)氯乙(yi)烯PVC絕(jue)緣基(ji)片直接(jie)(jie)接(jie)(jie)觸(chu)即(ji)可(ke)(ke)；同時壓敏電(dian)阻材料(liao)在工作過(guo)程中始(shi)終受到了聚(ju)(ju)氯乙(yi)烯PVC片的(de)(de)(de)絕(jue)緣保護。由(you)于兩(liang)(liang)條(tiao)銀導(dao)電(dian)電(dian)極(ji)均處于羥乙(yi)基(ji)纖維素HEC的(de)(de)(de)絕(jue)緣保護下(xia)，可(ke)(ke)有效防(fang)止兩(liang)(liang)電(dian)極(ji)間(jian)間(jian)距太(tai)小而(er)引起的(de)(de)(de)電(dian)子遷移所(suo)造成的(de)(de)(de)電(dian)極(ji)間(jian)短路(lu)現(xian)象(xiang)。該柔(rou)性(xing)單(dan)(dan)點(dian)力(li)(li)片式傳感器只有電(dian)極(ji)引出片部分區域外(wai)(wai)露，因此具有抗強(qiang)干擾的(de)(de)(de)優點(dian)。

本(ben)發(fa)明(ming)采用(yong)基于(yu)絲網印刷(shua)工(gong)藝的(de)(de)制造方(fang)法，使制得的(de)(de)單點力(li)傳感器具有重量輕、體積(ji)小(xiao)(片狀)、成本(ben)低、制作簡(jian)單、可(ke)批量化(hua)生產的(de)(de)特(te)點，并可(ke)重復使用(yong)、操(cao)作便捷。該傳感器可(ke)應用(yong)于(yu)工(gong)作空間狹(xia)小(xiao)的(de)(de)某一點接觸(chu)物體間的(de)(de)壓力(li)或集中(zhong)力(li)的(de)(de)檢(jian)測以及類似特(te)殊(shu)應用(yong)場合。

附圖說明

圖(tu)1為本(ben)發(fa)明柔(rou)性單(dan)點(dian)力(li)片式(shi)傳感器結構示意圖(tu)。圖(tu)中：1、下基(ji)(ji)板；2、粘接層；3、電(dian)極(ji)引出片；4、上基(ji)(ji)板；5、電(dian)極(ji)保(bao)護膜；6、印刷電(dian)極(ji)；7、壓敏體(ti)。

圖2為圖1的(de)俯(fu)視其及(ji)印刷(shua)電極的(de)局部剖視圖。圖中：8、上基板凸起；9、電極連(lian)接片。

圖3為(wei)圖2的剖面圖。圖中：10、下基板凹陷(xian)。

圖4為本(ben)發(fa)明柔性單點力片式傳感器一個(ge)應用實例(li)的測量電路(lu)原理(li)圖。

具(ju)體實施方式

下面結合附圖及(ji)實施例(li)對本發(fa)明作進(jin)一步的(de)詳細說(shuo)明。

如圖1-圖3所(suo)示，一(yi)(yi)(yi)種柔性單點力片(pian)(pian)(pian)(pian)式傳感器(qi)，包(bao)括上基(ji)板(ban)(ban)(ban)4和下基(ji)板(ban)(ban)(ban)1、壓(ya)敏(min)體(ti)7、設置在(zai)壓(ya)敏(min)體(ti)7垂直兩端(duan)面的兩個(ge)電(dian)(dian)極(ji)(ji)(ji)連(lian)(lian)接片(pian)(pian)(pian)(pian)9，上、下基(ji)板(ban)(ban)(ban)之(zhi)間由環(huan)氧(yang)樹脂粘(zhan)接層(ceng)2封接；上、下基(ji)板(ban)(ban)(ban)4、1可由聚氯乙(yi)烯(PVC)制成相同大小尺寸的矩(ju)形基(ji)片(pian)(pian)(pian)(pian)；在(zai)靠近上基(ji)板(ban)(ban)(ban)4長度(du)方(fang)向(xiang)的左側設置有一(yi)(yi)(yi)凸起8；在(zai)相對該(gai)凸起8的下基(ji)板(ban)(ban)(ban)上設置有一(yi)(yi)(yi)凹(ao)陷(xian)(xian)10，該(gai)凹(ao)陷(xian)(xian)與凸起之(zhi)間形成一(yi)(yi)(yi)個(ge)的密(mi)閉壓(ya)敏(min)體(ti)室(shi)，其(qi)中封裝(zhuang)有壓(ya)敏(min)體(ti)7及電(dian)(dian)極(ji)(ji)(ji)連(lian)(lian)接片(pian)(pian)(pian)(pian)9，壓(ya)敏(min)體(ti)室(shi)的大小剛好與壓(ya)敏(min)體(ti)7的大小吻(wen)合，壓(ya)敏(min)體(ti)7為圓片(pian)(pian)(pian)(pian)或方(fang)塊形壓(ya)敏(min)電(dian)(dian)阻；下基(ji)板(ban)(ban)(ban)1上設置有兩條沿其(qi)長度(du)方(fang)向(xiang)相互平行的印刷(shua)電(dian)(dian)極(ji)(ji)(ji)6，印刷(shua)電(dian)(dian)極(ji)(ji)(ji)6為銀導電(dian)(dian)帶狀薄(bo)膜。每條印刷(shua)電(dian)(dian)極(ji)(ji)(ji)在(zai)凹(ao)陷(xian)(xian)右邊沿處的一(yi)(yi)(yi)端(duan)連(lian)(lian)接一(yi)(yi)(yi)個(ge)電(dian)(dian)極(ji)(ji)(ji)連(lian)(lian)接片(pian)(pian)(pian)(pian)9；遠離凹(ao)陷(xian)(xian)到下基(ji)板(ban)(ban)(ban)1右側處的另一(yi)(yi)(yi)端(duan)連(lian)(lian)接一(yi)(yi)(yi)個(ge)電(dian)(dian)極(ji)(ji)(ji)引出(chu)(chu)片(pian)(pian)(pian)(pian)3，該(gai)電(dian)(dian)極(ji)(ji)(ji)引出(chu)(chu)片(pian)(pian)(pian)(pian)3外露(lu)下基(ji)板(ban)(ban)(ban)右側；印刷(shua)電(dian)(dian)極(ji)(ji)(ji)6從連(lian)(lian)接電(dian)(dian)極(ji)(ji)(ji)連(lian)(lian)接片(pian)(pian)(pian)(pian)9到連(lian)(lian)接電(dian)(dian)極(ji)(ji)(ji)引出(chu)(chu)片(pian)(pian)(pian)(pian)3的一(yi)(yi)(yi)段上表面設置有電(dian)(dian)極(ji)(ji)(ji)保(bao)護(hu)膜5，該(gai)電(dian)(dian)極(ji)(ji)(ji)保(bao)護(hu)膜為羥乙(yi)基(ji)纖(xian)維素(HEC)膜層(ceng)。

以上柔性單(dan)點力片式傳(chuan)感(gan)器制造方(fang)法，包括下述步驟：

a.先制備形狀大小相(xiang)同的上(shang)(shang)基板和下基板，在上(shang)(shang)基板長度方向的一側設置(zhi)一凸起；在相(xiang)對該凸起的下基板上(shang)(shang)設置(zhi)一凹陷；

b.將下(xia)基(ji)板1固定在絲網印(yin)刷機的(de)(de)印(yin)刷臺上，用導(dao)電(dian)料漿(jiang)沿(yan)下(xia)基(ji)板長度方向從(cong)遠離凹(ao)陷(xian)一側到(dao)凹(ao)陷(xian)的(de)(de)上表面(mian)印(yin)制兩(liang)條印(yin)刷電(dian)極，干燥后(hou)，在下(xia)基(ji)板遠離凹(ao)陷(xian)的(de)(de)一側設置兩(liang)個(ge)外露(lu)的(de)(de)電(dian)極引出片3。

c.在(zai)下(xia)基板凹(ao)陷(xian)中涂敷壓敏(min)電(dian)阻(zu)(zu)油墨，并放置一(yi)個壓敏(min)體，該壓敏(min)體上(shang)、下(xia)端面事先分(fen)別焊接(jie)(jie)好兩個電(dian)極連(lian)接(jie)(jie)片(pian)(pian)9，位于(yu)壓敏(min)體上(shang)、下(xia)端面的(de)兩電(dian)極連(lian)接(jie)(jie)片(pian)(pian)9分(fen)別連(lian)接(jie)(jie)至位于(yu)下(xia)基板上(shang)的(de)兩條(tiao)印(yin)刷(shua)電(dian)極6，兩條(tiao)印(yin)刷(shua)電(dian)極6的(de)另一(yi)端連(lian)接(jie)(jie)外露的(de)兩個電(dian)極引出片(pian)(pian)3；同時，在(zai)上(shang)基板4的(de)凸起(qi)內表面上(shang)涂敷壓敏(min)電(dian)阻(zu)(zu)油墨。

d.在下基板的(de)兩條印刷電極(ji)6上從連接電極(ji)連接片9到(dao)連接電極(ji)引出片3的(de)一段上表面(mian)涂敷一層(ceng)電極(ji)保護(hu)膜并干(gan)燥。

e.將(jiang)上、下(xia)基板(ban)用粘接層復合，使所述凸起(qi)與凹(ao)陷之間形成(cheng)一個的(de)密閉壓敏(min)(min)體(ti)(ti)室，將(jiang)壓敏(min)(min)體(ti)(ti)及電(dian)極連接片封裝(zhuang)在其內，壓敏(min)(min)體(ti)(ti)室的(de)大小剛好與壓敏(min)(min)體(ti)(ti)的(de)大小吻合，同時兩條印刷電(dian)極相互平(ping)行。

當上述絲網印刷(shua)單點(dian)力片式傳(chuan)感器(qi)與外(wai)接(jie)電(dian)(dian)路連(lian)接(jie)并通過能(neng)正常工作的測試后(hou)，該傳(chuan)感器(qi)外(wai)露部分電(dian)(dian)極引出片3與外(wai)接(jie)導線連(lian)接(jie)部分用(yong)絕緣硅膠將其覆蓋以防(fang)銀電(dian)(dian)極長期處(chu)于(yu)在空氣中(zhong)被氧化而削弱或喪失了其導電(dian)(dian)性能(neng)。

本發明柔性單點(dian)(dian)(dian)力(li)片(pian)式傳感器(qi)的檢測原理如下：當(dang)處(chu)于(yu)點(dian)(dian)(dian)接觸狀態(tai)時物體間的一(yi)集(ji)中(zhong)載荷(he)(集(ji)中(zhong)力(li))作(zuo)(zuo)用(yong)于(yu)壓(ya)敏電(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)7上(shang)時，壓(ya)敏電(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)因(yin)受(shou)到了壓(ya)力(li)作(zuo)(zuo)用(yong)便發生了一(yi)定(ding)的壓(ya)縮變(bian)形(xing)，從而(er)引(yin)起了壓(ya)敏電(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)值(zhi)的變(bian)化，反映在(zai)電(dian)(dian)(dian)(dian)(dian)路上(shang)便是兩銀導(dao)電(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)極6之間電(dian)(dian)(dian)(dian)(dian)壓(ya)值(zhi)的改變(bian)；根據(ju)壓(ya)敏電(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)上(shang)電(dian)(dian)(dian)(dian)(dian)壓(ya)值(zhi)相對于(yu)最初電(dian)(dian)(dian)(dian)(dian)壓(ya)值(zhi)的變(bian)化量便可反映出點(dian)(dian)(dian)接觸處(chu)壓(ya)力(li)或(huo)集(ji)中(zhong)載荷(he)的大小。集(ji)中(zhong)載荷(he)與(yu)(yu)軸向(xiang)(xiang)長度(du)、電(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)阻(zu)(zu)值(zhi)與(yu)(yu)軸向(xiang)(xiang)長度(du)的關(guan)系、電(dian)(dian)(dian)(dian)(dian)壓(ya)與(yu)(yu)電(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)的關(guan)系如下：

ΔL=FLES---(1)

其中：L——壓(ya)敏電阻的原始厚度；

S——壓敏(min)電阻的橫截面面積；

F——作用于(yu)壓敏(min)電(dian)阻上的集(ji)中載荷；

E——壓敏電(dian)阻的(de)彈性模量；

ΔL——壓敏電(dian)阻油墨厚度的改變量。

R=ρLS---(2)

其(qi)中：L——壓敏電阻油墨(mo)的厚度；

S——壓敏電阻(zu)油墨(mo)的橫(heng)截面面積；

ρ——壓敏電阻油墨(mo)的(de)電阻率；

R——壓敏電(dian)阻油墨的電(dian)阻值。

                U＝IR        (3)

其中(zhong)：I——流經壓敏(min)電阻的電流值(zhi)；

R——壓敏電阻(zu)油(you)墨的電阻(zu)值；

U——壓敏(min)電(dian)阻油(you)墨的電(dian)壓值；

如(ru)圖(tu)4所示(shi)，絲網(wang)印(yin)刷(shua)單點(dian)(dian)力(li)(li)片(pian)式傳感(gan)器(qi)的(de)(de)(de)(de)壓(ya)(ya)(ya)(ya)(ya)敏(min)(min)(min)(min)電(dian)(dian)(dian)(dian)阻(zu)(zu)因(yin)為只受到(dao)(dao)(dao)軸向壓(ya)(ya)(ya)(ya)(ya)縮變(bian)(bian)(bian)形而(er)(er)引起了其阻(zu)(zu)值(zhi)的(de)(de)(de)(de)改(gai)(gai)(gai)變(bian)(bian)(bian)，因(yin)此(ci)在(zai)測量(liang)電(dian)(dian)(dian)(dian)路(lu)(lu)中壓(ya)(ya)(ya)(ya)(ya)敏(min)(min)(min)(min)電(dian)(dian)(dian)(dian)阻(zu)(zu)可(ke)以(yi)被當(dang)作(zuo)(zuo)電(dian)(dian)(dian)(dian)路(lu)(lu)中的(de)(de)(de)(de)可(ke)變(bian)(bian)(bian)電(dian)(dian)(dian)(dian)阻(zu)(zu)對待；同(tong)時又由于壓(ya)(ya)(ya)(ya)(ya)敏(min)(min)(min)(min)電(dian)(dian)(dian)(dian)阻(zu)(zu)的(de)(de)(de)(de)改(gai)(gai)(gai)變(bian)(bian)(bian)引起了加(jia)在(zai)壓(ya)(ya)(ya)(ya)(ya)敏(min)(min)(min)(min)電(dian)(dian)(dian)(dian)阻(zu)(zu)兩(liang)端(duan)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)值(zhi)的(de)(de)(de)(de)改(gai)(gai)(gai)變(bian)(bian)(bian)，因(yin)此(ci)壓(ya)(ya)(ya)(ya)(ya)敏(min)(min)(min)(min)電(dian)(dian)(dian)(dian)阻(zu)(zu)端(duan)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)的(de)(de)(de)(de)改(gai)(gai)(gai)變(bian)(bian)(bian)可(ke)以(yi)被當(dang)作(zuo)(zuo)檢測電(dian)(dian)(dian)(dian)路(lu)(lu)的(de)(de)(de)(de)輸入(ru)變(bian)(bian)(bian)量(liang)信(xin)(xin)(xin)號(hao)(hao)。由于單點(dian)(dian)力(li)(li)傳感(gan)器(qi)的(de)(de)(de)(de)壓(ya)(ya)(ya)(ya)(ya)敏(min)(min)(min)(min)電(dian)(dian)(dian)(dian)阻(zu)(zu)因(yin)外(wai)力(li)(li)作(zuo)(zuo)用而(er)(er)引起了加(jia)在(zai)其兩(liang)端(duan)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)的(de)(de)(de)(de)改(gai)(gai)(gai)變(bian)(bian)(bian)，反相(xiang)比例(li)(li)放(fang)大電(dian)(dian)(dian)(dian)路(lu)(lu)的(de)(de)(de)(de)輸入(ru)端(duan)恰好是壓(ya)(ya)(ya)(ya)(ya)敏(min)(min)(min)(min)電(dian)(dian)(dian)(dian)阻(zu)(zu)端(duan)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)的(de)(de)(de)(de)改(gai)(gai)(gai)變(bian)(bian)(bian)端(duan)；因(yin)此(ci)壓(ya)(ya)(ya)(ya)(ya)敏(min)(min)(min)(min)電(dian)(dian)(dian)(dian)阻(zu)(zu)端(duan)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)的(de)(de)(de)(de)改(gai)(gai)(gai)變(bian)(bian)(bian)必然引起了反相(xiang)比例(li)(li)放(fang)大電(dian)(dian)(dian)(dian)路(lu)(lu)I輸出電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)值(zhi)的(de)(de)(de)(de)改(gai)(gai)(gai)變(bian)(bian)(bian)，也就是說單點(dian)(dian)力(li)(li)傳感(gan)器(qi)受外(wai)力(li)(li)作(zuo)(zuo)用是可(ke)以(yi)引起測量(liang)電(dian)(dian)(dian)(dian)路(lu)(lu)中相(xiang)應電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)的(de)(de)(de)(de)改(gai)(gai)(gai)變(bian)(bian)(bian)的(de)(de)(de)(de)。當(dang)外(wai)力(li)(li)作(zuo)(zuo)用于單點(dian)(dian)力(li)(li)傳感(gan)器(qi)后(hou)(hou)由于壓(ya)(ya)(ya)(ya)(ya)敏(min)(min)(min)(min)電(dian)(dian)(dian)(dian)阻(zu)(zu)值(zhi)的(de)(de)(de)(de)改(gai)(gai)(gai)變(bian)(bian)(bian)而(er)(er)產生了一定的(de)(de)(de)(de)微(wei)弱電(dian)(dian)(dian)(dian)信(xin)(xin)(xin)號(hao)(hao)，通(tong)過(guo)反相(xiang)比例(li)(li)放(fang)大器(qi)I將(jiang)(jiang)該信(xin)(xin)(xin)號(hao)(hao)放(fang)大；然后(hou)(hou)再(zai)通(tong)過(guo)低通(tong)濾波器(qi)將(jiang)(jiang)其他高頻干擾(rao)信(xin)(xin)(xin)號(hao)(hao)過(guo)濾或(huo)者去除；接著再(zai)通(tong)過(guo)反相(xiang)比例(li)(li)放(fang)大器(qi)II將(jiang)(jiang)電(dian)(dian)(dian)(dian)信(xin)(xin)(xin)號(hao)(hao)還原到(dao)(dao)(dao)最(zui)初的(de)(de)(de)(de)相(xiang)位(因(yin)為前后(hou)(hou)經過(guo)了兩(liang)次反相(xiang)放(fang)大，因(yin)此(ci)經過(guo)處理(li)后(hou)(hou)的(de)(de)(de)(de)信(xin)(xin)(xin)號(hao)(hao)可(ke)以(yi)恢復到(dao)(dao)(dao)原來的(de)(de)(de)(de)正電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)值(zhi)，同(tong)時將(jiang)(jiang)微(wei)弱電(dian)(dian)(dian)(dian)信(xin)(xin)(xin)號(hao)(hao)值(zhi)放(fang)大了)；最(zui)后(hou)(hou)再(zai)通(tong)過(guo)A/D轉(zhuan)換器(qi)限壓(ya)(ya)(ya)(ya)(ya)轉(zhuan)換將(jiang)(jiang)外(wai)力(li)(li)引起的(de)(de)(de)(de)并經過(guo)處理(li)的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)信(xin)(xin)(xin)號(hao)(hao)轉(zhuan)換為計算(suan)機能(neng)識(shi)別(bie)的(de)(de)(de)(de)數字(zi)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)信(xin)(xin)(xin)號(hao)(hao)，當(dang)然也可(ke)以(yi)直(zhi)接將(jiang)(jiang)反相(xiang)比例(li)(li)放(fang)大器(qi)II處理(li)后(hou)(hou)的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)信(xin)(xin)(xin)號(hao)(hao)直(zhi)接輸入(ru)至可(ke)以(yi)接收該信(xin)(xin)(xin)號(hao)(hao)的(de)(de)(de)(de)模(mo)擬顯(xian)示(shi)儀(yi)器(qi)或(huo)處理(li)儀(yi)器(qi)例(li)(li)如(ru)模(mo)擬信(xin)(xin)(xin)號(hao)(hao)示(shi)波顯(xian)示(shi)器(qi)或(huo)者模(mo)擬信(xin)(xin)(xin)號(hao)(hao)處理(li)電(dian)(dian)(dian)(dian)路(lu)(lu)板(ban)。