技術領域

本發明(ming)涉(she)及(ji)一(yi)(yi)種(zhong)傳感(gan)器及(ji)其制造方法，特別涉(she)及(ji)一(yi)(yi)種(zhong)用于在(zai)某(mou)一(yi)(yi)狹小(xiao)接觸區(qu)域中(zhong)對一(yi)(yi)點接觸物體間的(de)壓(ya)力(li)(li)(li)或(huo)集中(zhong)力(li)(li)(li)進行檢(jian)測的(de)柔性單(dan)點力(li)(li)(li)片式傳感(gan)器及(ji)其制造方法。

背景技術

壓力(li)(li)傳感器及檢(jian)測(ce)技術(shu)在航空(kong)航天、軍事工(gong)(gong)業、汽車、船(chuan)舶制造、工(gong)(gong)業自動化、醫學研究(jiu)、生物(wu)醫療等領域中發揮著重要的作(zuo)用(yong)(yong)。然而在上(shang)述應用(yong)(yong)領域，許多場合需在某(mou)一(yi)狹(xia)小空(kong)間(jian)(jian)中對某(mou)一(yi)點(dian)(dian)(dian)接(jie)觸(chu)物(wu)體(ti)間(jian)(jian)的壓力(li)(li)或(huo)集中力(li)(li)進行檢(jian)測(ce)，例如(ru)點(dian)(dian)(dian)接(jie)觸(chu)物(wu)體(ti)間(jian)(jian)在運動過程(cheng)中摩(mo)擦力(li)(li)相(xiang)互(hu)(hu)作(zuo)用(yong)(yong)過程(cheng)的研究(jiu)、例如(ru)檢(jian)測(ce)空(kong)間(jian)(jian)凸輪與滾子從動件處于(yu)點(dian)(dian)(dian)接(jie)觸(chu)狀態下(xia)的相(xiang)互(hu)(hu)作(zuo)用(yong)(yong)力(li)(li)、檢(jian)測(ce)某(mou)一(yi)對牙(ya)齒嚙合時的相(xiang)互(hu)(hu)作(zuo)用(yong)(yong)力(li)(li)等。由于(yu)受到傳感器重量、體(ti)積以及工(gong)(gong)作(zuo)空(kong)間(jian)(jian)(如(ru)狹(xia)縫)的限制，這時傳統壓力(li)(li)傳感器便(bian)不(bu)能用(yong)(yong)于(yu)上(shang)述場合下(xia)的使(shi)用(yong)(yong)來檢(jian)測(ce)某(mou)一(yi)點(dian)(dian)(dian)接(jie)觸(chu)物(wu)體(ti)間(jian)(jian)的壓力(li)(li)或(huo)集中力(li)(li)。即便(bian)勉強(qiang)使(shi)用(yong)(yong)，也不(bu)能滿足操作(zuo)便(bian)捷的要求，

發明內容

本發(fa)明針對傳(chuan)統壓力傳(chuan)感(gan)(gan)器(qi)不能對某(mou)一(yi)點(dian)(dian)接觸(chu)物(wu)體(ti)間壓力進行檢測(ce)、體(ti)積(ji)大、重(zhong)量(liang)重(zhong)、操(cao)作(zuo)不方便的缺點(dian)(dian)；提供了(le)一(yi)種能夠檢測(ce)出某(mou)一(yi)點(dian)(dian)接觸(chu)物(wu)體(ti)間壓力的柔性單點(dian)(dian)力片式(shi)傳(chuan)感(gan)(gan)器(qi)，該(gai)傳(chuan)感(gan)(gan)器(qi)具有體(ti)積(ji)小、重(zhong)量(liang)輕、制作(zuo)簡單、可低成本批量(liang)化生產的特點(dian)(dian)，并且可重(zhong)復(fu)使用、操(cao)作(zuo)簡便。

本發明的(de)另一(yi)個目的(de)是提供一(yi)種該(gai)傳感器的(de)制造方(fang)法。

為(wei)達到上述目的，本發明是采取如(ru)下技(ji)術方案予以(yi)實(shi)現的：

一(yi)種柔性單點力片(pian)(pian)(pian)式傳感器，包括壓(ya)(ya)(ya)敏(min)(min)體(ti)、分別設(she)(she)置在(zai)壓(ya)(ya)(ya)敏(min)(min)體(ti)上(shang)(shang)下(xia)端(duan)面的(de)(de)(de)(de)兩個電(dian)(dian)(dian)極連(lian)接(jie)片(pian)(pian)(pian)，其特征在(zai)于，還包括有(you)形狀大小(xiao)相同(tong)的(de)(de)(de)(de)上(shang)(shang)基(ji)板(ban)(ban)(ban)(ban)和下(xia)基(ji)板(ban)(ban)(ban)(ban)，上(shang)(shang)、下(xia)基(ji)板(ban)(ban)(ban)(ban)之(zhi)間由粘接(jie)層封接(jie)；在(zai)上(shang)(shang)基(ji)板(ban)(ban)(ban)(ban)長度方向的(de)(de)(de)(de)一(yi)側設(she)(she)置有(you)一(yi)凸起(qi)；在(zai)相對該(gai)(gai)凸起(qi)的(de)(de)(de)(de)下(xia)基(ji)板(ban)(ban)(ban)(ban)上(shang)(shang)設(she)(she)置有(you)一(yi)凹(ao)陷，該(gai)(gai)凹(ao)陷與所述(shu)凸起(qi)之(zhi)間形成一(yi)個密閉的(de)(de)(de)(de)壓(ya)(ya)(ya)敏(min)(min)體(ti)室(shi)，其中封裝有(you)所述(shu)的(de)(de)(de)(de)壓(ya)(ya)(ya)敏(min)(min)體(ti)及電(dian)(dian)(dian)極連(lian)接(jie)片(pian)(pian)(pian)，所述(shu)壓(ya)(ya)(ya)敏(min)(min)體(ti)室(shi)的(de)(de)(de)(de)大小(xiao)剛好與壓(ya)(ya)(ya)敏(min)(min)體(ti)的(de)(de)(de)(de)大小(xiao)吻合；所述(shu)下(xia)基(ji)板(ban)(ban)(ban)(ban)1沿其長度方向設(she)(she)置有(you)兩條相互平行的(de)(de)(de)(de)印刷電(dian)(dian)(dian)極6，每(mei)個印刷電(dian)(dian)(dian)極分別連(lian)接(jie)位于壓(ya)(ya)(ya)敏(min)(min)體(ti)上(shang)(shang)或下(xia)端(duan)面的(de)(de)(de)(de)電(dian)(dian)(dian)極連(lian)接(jie)片(pian)(pian)(pian)9和伸(shen)出下(xia)基(ji)板(ban)(ban)(ban)(ban)的(de)(de)(de)(de)電(dian)(dian)(dian)極引(yin)出片(pian)(pian)(pian)3；所述(shu)下(xia)基(ji)板(ban)(ban)(ban)(ban)上(shang)(shang)的(de)(de)(de)(de)兩條印刷電(dian)(dian)(dian)極6從連(lian)接(jie)電(dian)(dian)(dian)極連(lian)接(jie)片(pian)(pian)(pian)9到連(lian)接(jie)電(dian)(dian)(dian)極引(yin)出片(pian)(pian)(pian)3一(yi)段的(de)(de)(de)(de)上(shang)(shang)表面設(she)(she)置有(you)電(dian)(dian)(dian)極保護膜。

一種(zhong)上(shang)述(shu)柔(rou)性單點力片式(shi)傳感器的制造(zao)方法(fa)，其特(te)征在(zai)于，包括如下步驟：

a.先制備形狀(zhuang)大小(xiao)相(xiang)同的上基板和下基板，在(zai)(zai)上基板長度(du)方(fang)向的一(yi)(yi)側設置一(yi)(yi)凸起(qi)；在(zai)(zai)相(xiang)對該凸起(qi)的下基板上設置一(yi)(yi)凹陷；

b.將下基(ji)板(ban)1固定在(zai)絲(si)網印刷機的(de)印刷臺上，用導電料(liao)漿沿下基(ji)板(ban)長(chang)度方向從(cong)遠離凹陷一側到凹陷的(de)上表面印制(zhi)兩條印刷電極，干(gan)燥(zao)后，在(zai)下基(ji)板(ban)遠離凹陷的(de)一側設置兩個(ge)外露(lu)的(de)電極引出片(pian)3。

c.在下基板凹陷(xian)中涂敷壓(ya)敏(min)電(dian)(dian)(dian)阻油(you)墨，并放置一個壓(ya)敏(min)體，該(gai)壓(ya)敏(min)體上(shang)、下端面(mian)事(shi)先分(fen)(fen)別焊接好(hao)兩(liang)(liang)個電(dian)(dian)(dian)極(ji)連(lian)接片9，位于壓(ya)敏(min)體上(shang)、下端面(mian)的兩(liang)(liang)電(dian)(dian)(dian)極(ji)連(lian)接片9分(fen)(fen)別連(lian)接至位于下基板上(shang)的兩(liang)(liang)條印刷(shua)電(dian)(dian)(dian)極(ji)6的一端，兩(liang)(liang)條印刷(shua)電(dian)(dian)(dian)極(ji)6的另一端連(lian)接外露的兩(liang)(liang)個電(dian)(dian)(dian)極(ji)引出片3；同時，在上(shang)基板4的凸起內(nei)表面(mian)上(shang)涂敷壓(ya)敏(min)電(dian)(dian)(dian)阻油(you)墨。

d.在下基板的(de)兩條印刷電(dian)極6上從(cong)連(lian)接電(dian)極連(lian)接片9到連(lian)接電(dian)極引(yin)出(chu)片3的(de)一(yi)(yi)段上表面涂(tu)敷一(yi)(yi)層電(dian)極保護膜并干(gan)燥。

e.將上(shang)、下基板用(yong)粘接層復合，使(shi)所述凸(tu)起(qi)與(yu)凹陷(xian)之(zhi)間(jian)形成(cheng)一個(ge)的(de)(de)密閉壓敏(min)體(ti)室(shi)，將壓敏(min)體(ti)及電(dian)極(ji)連接片封裝在其內，壓敏(min)體(ti)室(shi)的(de)(de)大小剛好與(yu)壓敏(min)體(ti)的(de)(de)大小吻合，同時兩條(tiao)印(yin)刷電(dian)極(ji)相互平(ping)行(xing)。

以上方法中，所(suo)述(shu)(shu)的(de)印刷電(dian)極用(yong)導(dao)(dao)電(dian)漿(jiang)料(liao)為銀導(dao)(dao)電(dian)漿(jiang)料(liao)；所(suo)述(shu)(shu)的(de)電(dian)極保護膜材料(liao)采用(yong)羥乙(yi)基(ji)(ji)纖維素；所(suo)述(shu)(shu)的(de)壓(ya)敏電(dian)阻油墨(mo)采用(yong)碳二(er)硫化(hua)鉬(mu)油墨(mo)；所(suo)述(shu)(shu)的(de)上、下基(ji)(ji)板采用(yong)聚氯(lv)乙(yi)烯材料(liao)制成(cheng)矩(ju)形基(ji)(ji)片(pian)；所(suo)述(shu)(shu)的(de)粘接層采用(yong)環(huan)氧樹脂。

本(ben)發(fa)明的(de)柔(rou)性(xing)(xing)單(dan)點(dian)力(li)片(pian)式傳(chuan)感(gan)器不(bu)需(xu)要外加(jia)保護裝(zhuang)置，不(bu)用(yong)將壓(ya)敏(min)電阻直接(jie)置入被測(ce)對象內(nei)部，只需(xu)將被測(ce)對象的(de)點(dian)接(jie)觸部位與壓(ya)敏(min)電阻所(suo)對應的(de)壓(ya)敏(min)體室的(de)聚(ju)氯(lv)乙烯(xi)PVC絕緣(yuan)(yuan)基片(pian)直接(jie)接(jie)觸即可(ke)；同時壓(ya)敏(min)電阻材料(liao)在工作過(guo)程中始終(zhong)受到(dao)了聚(ju)氯(lv)乙烯(xi)PVC片(pian)的(de)絕緣(yuan)(yuan)保護。由于(yu)兩條銀(yin)導電電極(ji)均處于(yu)羥乙基纖(xian)維素HEC的(de)絕緣(yuan)(yuan)保護下，可(ke)有(you)效(xiao)防止兩電極(ji)間間距太(tai)小而引起的(de)電子遷(qian)移所(suo)造成的(de)電極(ji)間短路現象。該(gai)柔(rou)性(xing)(xing)單(dan)點(dian)力(li)片(pian)式傳(chuan)感(gan)器只有(you)電極(ji)引出片(pian)部分區域外露，因此具有(you)抗(kang)強干擾(rao)的(de)優點(dian)。

本(ben)發(fa)明采用基于絲網印刷工藝的(de)制(zhi)造方法，使制(zhi)得的(de)單點(dian)(dian)力傳感器具有重量輕、體(ti)積小(片(pian)狀)、成(cheng)本(ben)低、制(zhi)作簡單、可批量化(hua)生產(chan)的(de)特點(dian)(dian)，并可重復使用、操作便捷(jie)。該傳感器可應用于工作空間(jian)狹(xia)小的(de)某一點(dian)(dian)接觸物體(ti)間(jian)的(de)壓力或集(ji)中力的(de)檢測以及類似特殊應用場合。

附圖說明

圖1為本發明柔性單點力片(pian)式傳感器結構示意圖。圖中：1、下基(ji)板(ban)；2、粘接層；3、電極引出片(pian)；4、上基(ji)板(ban)；5、電極保護(hu)膜；6、印刷電極；7、壓(ya)敏體。

圖2為圖1的(de)俯視(shi)其及(ji)印(yin)刷電(dian)極的(de)局部(bu)剖視(shi)圖。圖中：8、上基板凸起(qi)；9、電(dian)極連接(jie)片。

圖(tu)(tu)(tu)3為圖(tu)(tu)(tu)2的(de)剖面圖(tu)(tu)(tu)。圖(tu)(tu)(tu)中：10、下基板凹(ao)陷。

圖4為(wei)本發明柔性(xing)單(dan)點力(li)片式傳感器一個(ge)應用(yong)實(shi)例的測(ce)量(liang)電路(lu)原理(li)圖。

具體(ti)實施方(fang)式

下面結(jie)合(he)附圖及(ji)實施例對本發明作進一(yi)步的詳(xiang)細說明。

如(ru)圖1-圖3所(suo)示，一種(zhong)柔性(xing)單點(dian)力片(pian)(pian)式傳感器，包括(kuo)上基板(ban)(ban)4和下(xia)(xia)基板(ban)(ban)1、壓(ya)(ya)(ya)敏(min)體(ti)(ti)7、設置在壓(ya)(ya)(ya)敏(min)體(ti)(ti)7垂直兩(liang)端(duan)面(mian)的(de)兩(liang)個電(dian)(dian)(dian)(dian)(dian)極(ji)(ji)(ji)(ji)連(lian)(lian)(lian)(lian)接(jie)片(pian)(pian)9，上、下(xia)(xia)基板(ban)(ban)之間(jian)由環氧樹脂粘接(jie)層(ceng)2封接(jie)；上、下(xia)(xia)基板(ban)(ban)4、1可由聚氯乙(yi)(yi)烯(xi)(PVC)制成相同大(da)(da)小尺寸的(de)矩形基片(pian)(pian)；在靠近上基板(ban)(ban)4長度(du)方(fang)(fang)(fang)向的(de)左側(ce)設置有(you)一凸起(qi)(qi)8；在相對該(gai)凸起(qi)(qi)8的(de)下(xia)(xia)基板(ban)(ban)上設置有(you)一凹(ao)陷10，該(gai)凹(ao)陷與凸起(qi)(qi)之間(jian)形成一個的(de)密閉壓(ya)(ya)(ya)敏(min)體(ti)(ti)室(shi)，其(qi)中(zhong)封裝有(you)壓(ya)(ya)(ya)敏(min)體(ti)(ti)7及電(dian)(dian)(dian)(dian)(dian)極(ji)(ji)(ji)(ji)連(lian)(lian)(lian)(lian)接(jie)片(pian)(pian)9，壓(ya)(ya)(ya)敏(min)體(ti)(ti)室(shi)的(de)大(da)(da)小剛好與壓(ya)(ya)(ya)敏(min)體(ti)(ti)7的(de)大(da)(da)小吻合(he)，壓(ya)(ya)(ya)敏(min)體(ti)(ti)7為圓(yuan)片(pian)(pian)或方(fang)(fang)(fang)塊形壓(ya)(ya)(ya)敏(min)電(dian)(dian)(dian)(dian)(dian)阻；下(xia)(xia)基板(ban)(ban)1上設置有(you)兩(liang)條沿其(qi)長度(du)方(fang)(fang)(fang)向相互(hu)平(ping)行的(de)印刷(shua)(shua)電(dian)(dian)(dian)(dian)(dian)極(ji)(ji)(ji)(ji)6，印刷(shua)(shua)電(dian)(dian)(dian)(dian)(dian)極(ji)(ji)(ji)(ji)6為銀導電(dian)(dian)(dian)(dian)(dian)帶(dai)狀薄膜(mo)。每條印刷(shua)(shua)電(dian)(dian)(dian)(dian)(dian)極(ji)(ji)(ji)(ji)在凹(ao)陷右邊沿處的(de)一端(duan)連(lian)(lian)(lian)(lian)接(jie)一個電(dian)(dian)(dian)(dian)(dian)極(ji)(ji)(ji)(ji)連(lian)(lian)(lian)(lian)接(jie)片(pian)(pian)9；遠(yuan)離凹(ao)陷到(dao)下(xia)(xia)基板(ban)(ban)1右側(ce)處的(de)另一端(duan)連(lian)(lian)(lian)(lian)接(jie)一個電(dian)(dian)(dian)(dian)(dian)極(ji)(ji)(ji)(ji)引出(chu)片(pian)(pian)3，該(gai)電(dian)(dian)(dian)(dian)(dian)極(ji)(ji)(ji)(ji)引出(chu)片(pian)(pian)3外露下(xia)(xia)基板(ban)(ban)右側(ce)；印刷(shua)(shua)電(dian)(dian)(dian)(dian)(dian)極(ji)(ji)(ji)(ji)6從(cong)連(lian)(lian)(lian)(lian)接(jie)電(dian)(dian)(dian)(dian)(dian)極(ji)(ji)(ji)(ji)連(lian)(lian)(lian)(lian)接(jie)片(pian)(pian)9到(dao)連(lian)(lian)(lian)(lian)接(jie)電(dian)(dian)(dian)(dian)(dian)極(ji)(ji)(ji)(ji)引出(chu)片(pian)(pian)3的(de)一段上表面(mian)設置有(you)電(dian)(dian)(dian)(dian)(dian)極(ji)(ji)(ji)(ji)保(bao)護膜(mo)5，該(gai)電(dian)(dian)(dian)(dian)(dian)極(ji)(ji)(ji)(ji)保(bao)護膜(mo)為羥乙(yi)(yi)基纖維素(HEC)膜(mo)層(ceng)。

以上柔(rou)性單點力片式傳感器(qi)制(zhi)造方法，包括下述(shu)步驟：

a.先制(zhi)備形狀大小相同的上基(ji)板和下基(ji)板，在上基(ji)板長(chang)度方(fang)向的一側設(she)置(zhi)一凸起；在相對該(gai)凸起的下基(ji)板上設(she)置(zhi)一凹陷；

b.將(jiang)下(xia)(xia)基板1固定在(zai)絲網印(yin)(yin)刷機的印(yin)(yin)刷臺上，用導(dao)電(dian)料漿(jiang)沿(yan)下(xia)(xia)基板長度方向從遠(yuan)(yuan)離凹陷(xian)(xian)一側到凹陷(xian)(xian)的上表面印(yin)(yin)制兩(liang)(liang)條印(yin)(yin)刷電(dian)極(ji)，干燥后，在(zai)下(xia)(xia)基板遠(yuan)(yuan)離凹陷(xian)(xian)的一側設置兩(liang)(liang)個外露(lu)的電(dian)極(ji)引出片3。

c.在(zai)下基板凹陷中涂敷壓(ya)(ya)敏電阻(zu)油墨，并放置一(yi)個(ge)壓(ya)(ya)敏體(ti)，該壓(ya)(ya)敏體(ti)上(shang)(shang)、下端(duan)面(mian)事先分(fen)別焊接好兩(liang)個(ge)電極(ji)連(lian)接片(pian)9，位(wei)于壓(ya)(ya)敏體(ti)上(shang)(shang)、下端(duan)面(mian)的兩(liang)電極(ji)連(lian)接片(pian)9分(fen)別連(lian)接至位(wei)于下基板上(shang)(shang)的兩(liang)條印刷(shua)電極(ji)6，兩(liang)條印刷(shua)電極(ji)6的另一(yi)端(duan)連(lian)接外露(lu)的兩(liang)個(ge)電極(ji)引出(chu)片(pian)3；同時，在(zai)上(shang)(shang)基板4的凸(tu)起內表面(mian)上(shang)(shang)涂敷壓(ya)(ya)敏電阻(zu)油墨。

d.在下基板的兩條印刷電(dian)極(ji)6上從連接電(dian)極(ji)連接片9到連接電(dian)極(ji)引出片3的一段上表面(mian)涂(tu)敷(fu)一層電(dian)極(ji)保護膜并干(gan)燥(zao)。

e.將上(shang)、下基板用粘接層復合(he)，使所述凸起與凹陷之間形成一個的密閉壓敏體室，將壓敏體及電(dian)極連(lian)接片封裝在(zai)其(qi)內，壓敏體室的大(da)小剛好與壓敏體的大(da)小吻合(he)，同時兩條印刷電(dian)極相互平行。

當上述絲網印刷單點力片(pian)式傳感器(qi)與(yu)外(wai)接(jie)電(dian)路連(lian)接(jie)并通過能(neng)(neng)正常工作(zuo)的測試后，該傳感器(qi)外(wai)露部(bu)分電(dian)極(ji)引(yin)出(chu)片(pian)3與(yu)外(wai)接(jie)導線連(lian)接(jie)部(bu)分用(yong)絕緣硅膠將其覆蓋以防銀(yin)電(dian)極(ji)長(chang)期處于(yu)在(zai)空氣中被氧化而削弱或喪(sang)失了(le)其導電(dian)性能(neng)(neng)。

本發明柔(rou)性單點(dian)力(li)片(pian)式傳感(gan)器(qi)的檢(jian)測原理(li)如下(xia)：當(dang)處(chu)于點(dian)接觸(chu)狀態時物體間的一集(ji)中載荷(he)(集(ji)中力(li))作用于壓(ya)(ya)敏電(dian)(dian)(dian)(dian)阻(zu)(zu)7上(shang)時，壓(ya)(ya)敏電(dian)(dian)(dian)(dian)阻(zu)(zu)因受到了(le)壓(ya)(ya)力(li)作用便(bian)發生(sheng)了(le)一定的壓(ya)(ya)縮(suo)變形，從而引起了(le)壓(ya)(ya)敏電(dian)(dian)(dian)(dian)阻(zu)(zu)值(zhi)(zhi)的變化，反映在電(dian)(dian)(dian)(dian)路(lu)上(shang)便(bian)是(shi)兩銀導(dao)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)極6之間電(dian)(dian)(dian)(dian)壓(ya)(ya)值(zhi)(zhi)的改(gai)變；根據壓(ya)(ya)敏電(dian)(dian)(dian)(dian)阻(zu)(zu)上(shang)電(dian)(dian)(dian)(dian)壓(ya)(ya)值(zhi)(zhi)相(xiang)對(dui)于最初電(dian)(dian)(dian)(dian)壓(ya)(ya)值(zhi)(zhi)的變化量便(bian)可反映出點(dian)接觸(chu)處(chu)壓(ya)(ya)力(li)或(huo)集(ji)中載荷(he)的大(da)小。集(ji)中載荷(he)與(yu)軸(zhou)向長度(du)、電(dian)(dian)(dian)(dian)阻(zu)(zu)阻(zu)(zu)值(zhi)(zhi)與(yu)軸(zhou)向長度(du)的關(guan)系、電(dian)(dian)(dian)(dian)壓(ya)(ya)與(yu)電(dian)(dian)(dian)(dian)阻(zu)(zu)的關(guan)系如下(xia)：

ΔL=FLES---(1)

其中：L——壓(ya)敏電阻的原始厚(hou)度；

S——壓敏電阻的(de)橫截面面積；

F——作用(yong)于壓敏(min)電阻上的集中載荷；

E——壓敏(min)電阻的彈性模量(liang)；

ΔL——壓敏電(dian)阻油墨(mo)厚度的改(gai)變量。

R=ρLS---(2)

其(qi)中：L——壓敏(min)電阻油(you)墨的厚度(du)；

S——壓敏電阻油墨的(de)橫(heng)截(jie)面面積；

ρ——壓敏電阻油墨的電阻率；

R——壓敏電阻油墨的電阻值(zhi)。

                U＝IR        (3)

其中：I——流經(jing)壓敏電阻的電流值；

R——壓敏電阻油墨(mo)的電阻值；

U——壓敏電(dian)阻(zu)油(you)墨的電(dian)壓值；

如圖4所示(shi)，絲網印(yin)刷單(dan)點力片式傳(chuan)感(gan)(gan)器(qi)(qi)(qi)(qi)的(de)(de)(de)(de)(de)(de)(de)(de)(de)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)敏(min)(min)(min)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)因為(wei)只受(shou)到(dao)軸向壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)縮變(bian)(bian)(bian)形(xing)而(er)引起(qi)(qi)(qi)了(le)其阻(zu)值(zhi)的(de)(de)(de)(de)(de)(de)(de)(de)(de)改(gai)(gai)(gai)(gai)變(bian)(bian)(bian)，因此(ci)在測量電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路中(zhong)(zhong)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)敏(min)(min)(min)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)可以被當作(zuo)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路中(zhong)(zhong)的(de)(de)(de)(de)(de)(de)(de)(de)(de)可變(bian)(bian)(bian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)對待(dai)；同(tong)時又由于(yu)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)敏(min)(min)(min)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)的(de)(de)(de)(de)(de)(de)(de)(de)(de)改(gai)(gai)(gai)(gai)變(bian)(bian)(bian)引起(qi)(qi)(qi)了(le)加(jia)在壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)敏(min)(min)(min)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)兩端(duan)(duan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)值(zhi)的(de)(de)(de)(de)(de)(de)(de)(de)(de)改(gai)(gai)(gai)(gai)變(bian)(bian)(bian)，因此(ci)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)敏(min)(min)(min)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)端(duan)(duan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)的(de)(de)(de)(de)(de)(de)(de)(de)(de)改(gai)(gai)(gai)(gai)變(bian)(bian)(bian)可以被當作(zuo)檢測電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路的(de)(de)(de)(de)(de)(de)(de)(de)(de)輸(shu)入(ru)變(bian)(bian)(bian)量信(xin)(xin)(xin)(xin)號。由于(yu)單(dan)點力傳(chuan)感(gan)(gan)器(qi)(qi)(qi)(qi)的(de)(de)(de)(de)(de)(de)(de)(de)(de)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)敏(min)(min)(min)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)因外(wai)(wai)力作(zuo)用而(er)引起(qi)(qi)(qi)了(le)加(jia)在其兩端(duan)(duan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)的(de)(de)(de)(de)(de)(de)(de)(de)(de)改(gai)(gai)(gai)(gai)變(bian)(bian)(bian)，反(fan)(fan)相(xiang)(xiang)(xiang)比例(li)(li)(li)放(fang)大(da)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路的(de)(de)(de)(de)(de)(de)(de)(de)(de)輸(shu)入(ru)端(duan)(duan)恰好是(shi)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)敏(min)(min)(min)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)端(duan)(duan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)的(de)(de)(de)(de)(de)(de)(de)(de)(de)改(gai)(gai)(gai)(gai)變(bian)(bian)(bian)端(duan)(duan)；因此(ci)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)敏(min)(min)(min)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)端(duan)(duan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)的(de)(de)(de)(de)(de)(de)(de)(de)(de)改(gai)(gai)(gai)(gai)變(bian)(bian)(bian)必然引起(qi)(qi)(qi)了(le)反(fan)(fan)相(xiang)(xiang)(xiang)比例(li)(li)(li)放(fang)大(da)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路I輸(shu)出電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)值(zhi)的(de)(de)(de)(de)(de)(de)(de)(de)(de)改(gai)(gai)(gai)(gai)變(bian)(bian)(bian)，也就是(shi)說單(dan)點力傳(chuan)感(gan)(gan)器(qi)(qi)(qi)(qi)受(shou)外(wai)(wai)力作(zuo)用是(shi)可以引起(qi)(qi)(qi)測量電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路中(zhong)(zhong)相(xiang)(xiang)(xiang)應電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)的(de)(de)(de)(de)(de)(de)(de)(de)(de)改(gai)(gai)(gai)(gai)變(bian)(bian)(bian)的(de)(de)(de)(de)(de)(de)(de)(de)(de)。當外(wai)(wai)力作(zuo)用于(yu)單(dan)點力傳(chuan)感(gan)(gan)器(qi)(qi)(qi)(qi)后由于(yu)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)敏(min)(min)(min)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)值(zhi)的(de)(de)(de)(de)(de)(de)(de)(de)(de)改(gai)(gai)(gai)(gai)變(bian)(bian)(bian)而(er)產生了(le)一定(ding)的(de)(de)(de)(de)(de)(de)(de)(de)(de)微弱電(dian)(dian)(dian)(dian)(dian)(dian)(dian)信(xin)(xin)(xin)(xin)號，通(tong)過(guo)(guo)(guo)反(fan)(fan)相(xiang)(xiang)(xiang)比例(li)(li)(li)放(fang)大(da)器(qi)(qi)(qi)(qi)I將(jiang)(jiang)(jiang)該信(xin)(xin)(xin)(xin)號放(fang)大(da)；然后再(zai)(zai)通(tong)過(guo)(guo)(guo)低通(tong)濾波(bo)器(qi)(qi)(qi)(qi)將(jiang)(jiang)(jiang)其他高頻干擾信(xin)(xin)(xin)(xin)號過(guo)(guo)(guo)濾或者去(qu)除(chu)；接(jie)著再(zai)(zai)通(tong)過(guo)(guo)(guo)反(fan)(fan)相(xiang)(xiang)(xiang)比例(li)(li)(li)放(fang)大(da)器(qi)(qi)(qi)(qi)II將(jiang)(jiang)(jiang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)信(xin)(xin)(xin)(xin)號還原到(dao)最初的(de)(de)(de)(de)(de)(de)(de)(de)(de)相(xiang)(xiang)(xiang)位(wei)(因為(wei)前后經過(guo)(guo)(guo)了(le)兩次反(fan)(fan)相(xiang)(xiang)(xiang)放(fang)大(da)，因此(ci)經過(guo)(guo)(guo)處(chu)理(li)后的(de)(de)(de)(de)(de)(de)(de)(de)(de)信(xin)(xin)(xin)(xin)號可以恢復到(dao)原來的(de)(de)(de)(de)(de)(de)(de)(de)(de)正電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)值(zhi)，同(tong)時將(jiang)(jiang)(jiang)微弱電(dian)(dian)(dian)(dian)(dian)(dian)(dian)信(xin)(xin)(xin)(xin)號值(zhi)放(fang)大(da)了(le))；最后再(zai)(zai)通(tong)過(guo)(guo)(guo)A/D轉換(huan)器(qi)(qi)(qi)(qi)限壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)轉換(huan)將(jiang)(jiang)(jiang)外(wai)(wai)力引起(qi)(qi)(qi)的(de)(de)(de)(de)(de)(de)(de)(de)(de)并經過(guo)(guo)(guo)處(chu)理(li)的(de)(de)(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)信(xin)(xin)(xin)(xin)號轉換(huan)為(wei)計算機(ji)能識別的(de)(de)(de)(de)(de)(de)(de)(de)(de)數字電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)信(xin)(xin)(xin)(xin)號，當然也可以直接(jie)將(jiang)(jiang)(jiang)反(fan)(fan)相(xiang)(xiang)(xiang)比例(li)(li)(li)放(fang)大(da)器(qi)(qi)(qi)(qi)II處(chu)理(li)后的(de)(de)(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)信(xin)(xin)(xin)(xin)號直接(jie)輸(shu)入(ru)至可以接(jie)收該信(xin)(xin)(xin)(xin)號的(de)(de)(de)(de)(de)(de)(de)(de)(de)模擬顯(xian)示(shi)儀器(qi)(qi)(qi)(qi)或處(chu)理(li)儀器(qi)(qi)(qi)(qi)例(li)(li)(li)如模擬信(xin)(xin)(xin)(xin)號示(shi)波(bo)顯(xian)示(shi)器(qi)(qi)(qi)(qi)或者模擬信(xin)(xin)(xin)(xin)號處(chu)理(li)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路板(ban)。