技術領域

本發明(ming)涉及(ji)一(yi)(yi)種傳感器及(ji)其制(zhi)造(zao)方法，特(te)別涉及(ji)一(yi)(yi)種用于在(zai)某一(yi)(yi)狹小接觸區域中對一(yi)(yi)點接觸物體間的壓力(li)或集(ji)中力(li)進行檢測的柔性(xing)單(dan)點力(li)片式傳感器及(ji)其制(zhi)造(zao)方法。

背景技術

壓(ya)力(li)傳感(gan)器(qi)(qi)及檢(jian)測(ce)技術(shu)在航空航天(tian)、軍事工業、汽車、船舶制(zhi)造、工業自動化、醫(yi)學研(yan)究、生物醫(yi)療等領域中發(fa)揮著重要(yao)的(de)(de)(de)作用(yong)(yong)(yong)(yong)。然而在上(shang)述(shu)應用(yong)(yong)(yong)(yong)領域，許多場合(he)需在某(mou)一(yi)狹小空間中對某(mou)一(yi)點(dian)接(jie)(jie)觸物體(ti)(ti)間的(de)(de)(de)壓(ya)力(li)或集中力(li)進行檢(jian)測(ce)，例如點(dian)接(jie)(jie)觸物體(ti)(ti)間在運動過程中摩擦力(li)相互作用(yong)(yong)(yong)(yong)過程的(de)(de)(de)研(yan)究、例如檢(jian)測(ce)空間凸輪(lun)與滾(gun)子從動件處于(yu)點(dian)接(jie)(jie)觸狀態下的(de)(de)(de)相互作用(yong)(yong)(yong)(yong)力(li)、檢(jian)測(ce)某(mou)一(yi)對牙齒嚙合(he)時的(de)(de)(de)相互作用(yong)(yong)(yong)(yong)力(li)等。由于(yu)受(shou)到傳感(gan)器(qi)(qi)重量、體(ti)(ti)積(ji)以及工作空間(如狹縫(feng))的(de)(de)(de)限制(zhi)，這時傳統壓(ya)力(li)傳感(gan)器(qi)(qi)便不(bu)能(neng)用(yong)(yong)(yong)(yong)于(yu)上(shang)述(shu)場合(he)下的(de)(de)(de)使用(yong)(yong)(yong)(yong)來檢(jian)測(ce)某(mou)一(yi)點(dian)接(jie)(jie)觸物體(ti)(ti)間的(de)(de)(de)壓(ya)力(li)或集中力(li)。即便勉強使用(yong)(yong)(yong)(yong)，也不(bu)能(neng)滿足(zu)操作便捷的(de)(de)(de)要(yao)求，

發明內容

本發(fa)明(ming)針對(dui)傳(chuan)統壓(ya)力(li)(li)傳(chuan)感器不能(neng)對(dui)某(mou)一(yi)點(dian)接(jie)觸(chu)物體間(jian)壓(ya)力(li)(li)進行檢測、體積大、重(zhong)量(liang)重(zhong)、操作不方便(bian)的(de)(de)缺點(dian)；提(ti)供了(le)一(yi)種能(neng)夠檢測出(chu)某(mou)一(yi)點(dian)接(jie)觸(chu)物體間(jian)壓(ya)力(li)(li)的(de)(de)柔性(xing)單(dan)點(dian)力(li)(li)片(pian)式傳(chuan)感器，該傳(chuan)感器具有體積小、重(zhong)量(liang)輕、制作簡(jian)單(dan)、可低成本批量(liang)化生產的(de)(de)特點(dian)，并且可重(zhong)復使用、操作簡(jian)便(bian)。

本發(fa)明的另一個目的是(shi)提供一種該傳感器(qi)的制造方法。

為(wei)達(da)到上述目的，本發明(ming)是采取如下技術方(fang)案予以實現的：

一種柔(rou)性(xing)單點力片(pian)式傳(chuan)感(gan)器，包括(kuo)(kuo)壓(ya)(ya)敏(min)(min)體、分(fen)別設置(zhi)在(zai)壓(ya)(ya)敏(min)(min)體上(shang)下(xia)(xia)(xia)端面(mian)的(de)(de)(de)兩(liang)個電(dian)(dian)極(ji)(ji)連(lian)(lian)接(jie)(jie)(jie)片(pian)，其特征在(zai)于(yu)，還(huan)包括(kuo)(kuo)有形狀大小相同的(de)(de)(de)上(shang)基(ji)(ji)(ji)板(ban)和(he)下(xia)(xia)(xia)基(ji)(ji)(ji)板(ban)，上(shang)、下(xia)(xia)(xia)基(ji)(ji)(ji)板(ban)之間由粘接(jie)(jie)(jie)層封接(jie)(jie)(jie)；在(zai)上(shang)基(ji)(ji)(ji)板(ban)長度方(fang)向的(de)(de)(de)一側設置(zhi)有一凸起；在(zai)相對該(gai)凸起的(de)(de)(de)下(xia)(xia)(xia)基(ji)(ji)(ji)板(ban)上(shang)設置(zhi)有一凹陷(xian)，該(gai)凹陷(xian)與所述凸起之間形成一個密閉的(de)(de)(de)壓(ya)(ya)敏(min)(min)體室(shi)，其中封裝有所述的(de)(de)(de)壓(ya)(ya)敏(min)(min)體及(ji)電(dian)(dian)極(ji)(ji)連(lian)(lian)接(jie)(jie)(jie)片(pian)，所述壓(ya)(ya)敏(min)(min)體室(shi)的(de)(de)(de)大小剛好與壓(ya)(ya)敏(min)(min)體的(de)(de)(de)大小吻合；所述下(xia)(xia)(xia)基(ji)(ji)(ji)板(ban)1沿其長度方(fang)向設置(zhi)有兩(liang)條相互平行的(de)(de)(de)印(yin)(yin)(yin)刷(shua)電(dian)(dian)極(ji)(ji)6，每個印(yin)(yin)(yin)刷(shua)電(dian)(dian)極(ji)(ji)分(fen)別連(lian)(lian)接(jie)(jie)(jie)位于(yu)壓(ya)(ya)敏(min)(min)體上(shang)或下(xia)(xia)(xia)端面(mian)的(de)(de)(de)電(dian)(dian)極(ji)(ji)連(lian)(lian)接(jie)(jie)(jie)片(pian)9和(he)伸出下(xia)(xia)(xia)基(ji)(ji)(ji)板(ban)的(de)(de)(de)電(dian)(dian)極(ji)(ji)引出片(pian)3；所述下(xia)(xia)(xia)基(ji)(ji)(ji)板(ban)上(shang)的(de)(de)(de)兩(liang)條印(yin)(yin)(yin)刷(shua)電(dian)(dian)極(ji)(ji)6從連(lian)(lian)接(jie)(jie)(jie)電(dian)(dian)極(ji)(ji)連(lian)(lian)接(jie)(jie)(jie)片(pian)9到連(lian)(lian)接(jie)(jie)(jie)電(dian)(dian)極(ji)(ji)引出片(pian)3一段的(de)(de)(de)上(shang)表面(mian)設置(zhi)有電(dian)(dian)極(ji)(ji)保護膜。

一種上述(shu)柔性(xing)單點力片式傳(chuan)感器的制造方法，其特征在于，包括(kuo)如下步驟(zou)：

a.先制備形狀大小相(xiang)同的上(shang)(shang)基板(ban)(ban)和下(xia)基板(ban)(ban)，在上(shang)(shang)基板(ban)(ban)長(chang)度(du)方向的一側(ce)設置一凸(tu)(tu)起；在相(xiang)對該凸(tu)(tu)起的下(xia)基板(ban)(ban)上(shang)(shang)設置一凹陷；

b.將下(xia)基板1固(gu)定(ding)在絲網(wang)印(yin)刷機的(de)印(yin)刷臺上(shang)，用導電料漿沿下(xia)基板長度方(fang)向從遠離(li)凹(ao)陷一(yi)側到(dao)凹(ao)陷的(de)上(shang)表(biao)面印(yin)制兩條印(yin)刷電極，干燥后(hou)，在下(xia)基板遠離(li)凹(ao)陷的(de)一(yi)側設置兩個外露的(de)電極引出片3。

c.在(zai)下基(ji)板凹陷中涂敷壓(ya)(ya)敏電阻油墨，并(bing)放(fang)置一(yi)個壓(ya)(ya)敏體，該壓(ya)(ya)敏體上、下端面(mian)事(shi)先(xian)分別(bie)焊接(jie)好兩(liang)(liang)個電極(ji)連(lian)接(jie)片(pian)9，位于(yu)壓(ya)(ya)敏體上、下端面(mian)的(de)兩(liang)(liang)電極(ji)連(lian)接(jie)片(pian)9分別(bie)連(lian)接(jie)至位于(yu)下基(ji)板上的(de)兩(liang)(liang)條(tiao)印(yin)刷電極(ji)6的(de)一(yi)端，兩(liang)(liang)條(tiao)印(yin)刷電極(ji)6的(de)另一(yi)端連(lian)接(jie)外(wai)露的(de)兩(liang)(liang)個電極(ji)引出片(pian)3；同時，在(zai)上基(ji)板4的(de)凸起內表面(mian)上涂敷壓(ya)(ya)敏電阻油墨。

d.在下基板的兩條印(yin)刷(shua)電(dian)極(ji)6上(shang)從(cong)連(lian)接電(dian)極(ji)連(lian)接片(pian)9到連(lian)接電(dian)極(ji)引(yin)出片(pian)3的一段上(shang)表面涂敷(fu)一層電(dian)極(ji)保護(hu)膜(mo)并干燥。

e.將(jiang)上、下基板(ban)用粘接層(ceng)復(fu)合，使(shi)所述凸起與凹陷之間形成一個的(de)密閉壓(ya)(ya)敏體(ti)室，將(jiang)壓(ya)(ya)敏體(ti)及電(dian)極連接片封(feng)裝在(zai)其(qi)內，壓(ya)(ya)敏體(ti)室的(de)大小(xiao)剛(gang)好(hao)與壓(ya)(ya)敏體(ti)的(de)大小(xiao)吻合，同時兩條印刷電(dian)極相互平行。

以上(shang)方法中(zhong)，所(suo)述(shu)的(de)(de)(de)印刷電極(ji)用(yong)導(dao)(dao)電漿(jiang)料為銀導(dao)(dao)電漿(jiang)料；所(suo)述(shu)的(de)(de)(de)電極(ji)保護膜材(cai)料采用(yong)羥(qian)乙基纖維素(su)；所(suo)述(shu)的(de)(de)(de)壓敏(min)電阻油墨(mo)采用(yong)碳二硫化鉬油墨(mo)；所(suo)述(shu)的(de)(de)(de)上(shang)、下基板采用(yong)聚氯乙烯(xi)材(cai)料制成矩(ju)形基片(pian)；所(suo)述(shu)的(de)(de)(de)粘接層采用(yong)環氧樹脂。

本發明的(de)(de)(de)柔性單(dan)點力片(pian)式(shi)傳感器(qi)不需要外加(jia)保(bao)護(hu)裝(zhuang)置，不用(yong)將壓(ya)(ya)(ya)敏(min)電(dian)(dian)(dian)阻直接(jie)(jie)置入被測對(dui)象(xiang)內部，只需將被測對(dui)象(xiang)的(de)(de)(de)點接(jie)(jie)觸(chu)部位與壓(ya)(ya)(ya)敏(min)電(dian)(dian)(dian)阻所對(dui)應的(de)(de)(de)壓(ya)(ya)(ya)敏(min)體室的(de)(de)(de)聚氯乙烯PVC絕(jue)緣基片(pian)直接(jie)(jie)接(jie)(jie)觸(chu)即可；同時壓(ya)(ya)(ya)敏(min)電(dian)(dian)(dian)阻材料(liao)在工作(zuo)過程中始終受到了聚氯乙烯PVC片(pian)的(de)(de)(de)絕(jue)緣保(bao)護(hu)。由于(yu)兩(liang)(liang)條(tiao)銀導電(dian)(dian)(dian)電(dian)(dian)(dian)極均(jun)處(chu)于(yu)羥乙基纖維素(su)HEC的(de)(de)(de)絕(jue)緣保(bao)護(hu)下(xia)，可有效防止兩(liang)(liang)電(dian)(dian)(dian)極間間距太小(xiao)而引(yin)起的(de)(de)(de)電(dian)(dian)(dian)子遷移所造成的(de)(de)(de)電(dian)(dian)(dian)極間短路現(xian)象(xiang)。該柔性單(dan)點力片(pian)式(shi)傳感器(qi)只有電(dian)(dian)(dian)極引(yin)出片(pian)部分區域外露，因此具有抗(kang)強干(gan)擾的(de)(de)(de)優點。

本發明采用(yong)基于絲網印刷(shua)工藝(yi)的(de)制造方法，使(shi)制得的(de)單點力傳感(gan)(gan)器具有重(zhong)量輕、體積(ji)小(片狀)、成(cheng)本低、制作簡單、可(ke)批量化生產的(de)特(te)點，并(bing)可(ke)重(zhong)復使(shi)用(yong)、操作便捷。該傳感(gan)(gan)器可(ke)應用(yong)于工作空(kong)間狹小的(de)某一(yi)點接觸物體間的(de)壓力或集中力的(de)檢測以及類似(si)特(te)殊應用(yong)場(chang)合。

附圖說明

圖(tu)1為本發明(ming)柔性單(dan)點力片式傳感器結(jie)構示意圖(tu)。圖(tu)中：1、下(xia)基板；2、粘接層(ceng)；3、電(dian)(dian)(dian)極引出片；4、上基板；5、電(dian)(dian)(dian)極保護膜；6、印刷電(dian)(dian)(dian)極；7、壓(ya)敏體。

圖2為圖1的俯視(shi)(shi)其及印刷電極(ji)的局部(bu)剖視(shi)(shi)圖。圖中：8、上基板(ban)凸起；9、電極(ji)連接片(pian)。

圖3為圖2的剖面圖。圖中：10、下基板凹陷。

圖4為本發(fa)明柔(rou)性單(dan)點(dian)力片式(shi)傳感器一(yi)個應(ying)用實例的測量電(dian)路原理圖。

具體實施(shi)方式

下面結合附圖及實施例對本發(fa)明作進一步的詳細說明。

如圖(tu)(tu)1-圖(tu)(tu)3所(suo)示，一種柔(rou)性單點力片(pian)(pian)(pian)式傳(chuan)感器，包(bao)括上(shang)(shang)基(ji)板(ban)4和下基(ji)板(ban)1、壓敏(min)(min)體(ti)(ti)7、設(she)(she)(she)置(zhi)在(zai)壓敏(min)(min)體(ti)(ti)7垂直(zhi)兩(liang)(liang)端(duan)面(mian)的(de)兩(liang)(liang)個(ge)(ge)電(dian)(dian)(dian)極(ji)連(lian)接(jie)(jie)(jie)片(pian)(pian)(pian)9，上(shang)(shang)、下基(ji)板(ban)之間由(you)(you)環氧樹脂(zhi)粘接(jie)(jie)(jie)層2封接(jie)(jie)(jie)；上(shang)(shang)、下基(ji)板(ban)4、1可由(you)(you)聚氯(lv)乙(yi)烯(PVC)制成(cheng)相(xiang)(xiang)同大小尺寸的(de)矩形(xing)基(ji)片(pian)(pian)(pian)；在(zai)靠近上(shang)(shang)基(ji)板(ban)4長度(du)方向(xiang)的(de)左側(ce)(ce)設(she)(she)(she)置(zhi)有(you)一凸(tu)(tu)起(qi)8；在(zai)相(xiang)(xiang)對該(gai)凸(tu)(tu)起(qi)8的(de)下基(ji)板(ban)上(shang)(shang)設(she)(she)(she)置(zhi)有(you)一凹(ao)陷10，該(gai)凹(ao)陷與(yu)(yu)凸(tu)(tu)起(qi)之間形(xing)成(cheng)一個(ge)(ge)的(de)密閉壓敏(min)(min)體(ti)(ti)室，其(qi)(qi)中封裝(zhuang)有(you)壓敏(min)(min)體(ti)(ti)7及電(dian)(dian)(dian)極(ji)連(lian)接(jie)(jie)(jie)片(pian)(pian)(pian)9，壓敏(min)(min)體(ti)(ti)室的(de)大小剛好與(yu)(yu)壓敏(min)(min)體(ti)(ti)7的(de)大小吻合，壓敏(min)(min)體(ti)(ti)7為圓片(pian)(pian)(pian)或(huo)方塊形(xing)壓敏(min)(min)電(dian)(dian)(dian)阻；下基(ji)板(ban)1上(shang)(shang)設(she)(she)(she)置(zhi)有(you)兩(liang)(liang)條(tiao)(tiao)沿其(qi)(qi)長度(du)方向(xiang)相(xiang)(xiang)互平(ping)行的(de)印刷電(dian)(dian)(dian)極(ji)6，印刷電(dian)(dian)(dian)極(ji)6為銀導電(dian)(dian)(dian)帶狀薄膜(mo)。每(mei)條(tiao)(tiao)印刷電(dian)(dian)(dian)極(ji)在(zai)凹(ao)陷右邊沿處(chu)的(de)一端(duan)連(lian)接(jie)(jie)(jie)一個(ge)(ge)電(dian)(dian)(dian)極(ji)連(lian)接(jie)(jie)(jie)片(pian)(pian)(pian)9；遠離凹(ao)陷到下基(ji)板(ban)1右側(ce)(ce)處(chu)的(de)另一端(duan)連(lian)接(jie)(jie)(jie)一個(ge)(ge)電(dian)(dian)(dian)極(ji)引(yin)出片(pian)(pian)(pian)3，該(gai)電(dian)(dian)(dian)極(ji)引(yin)出片(pian)(pian)(pian)3外(wai)露下基(ji)板(ban)右側(ce)(ce)；印刷電(dian)(dian)(dian)極(ji)6從連(lian)接(jie)(jie)(jie)電(dian)(dian)(dian)極(ji)連(lian)接(jie)(jie)(jie)片(pian)(pian)(pian)9到連(lian)接(jie)(jie)(jie)電(dian)(dian)(dian)極(ji)引(yin)出片(pian)(pian)(pian)3的(de)一段上(shang)(shang)表面(mian)設(she)(she)(she)置(zhi)有(you)電(dian)(dian)(dian)極(ji)保護膜(mo)5，該(gai)電(dian)(dian)(dian)極(ji)保護膜(mo)為羥乙(yi)基(ji)纖維素(HEC)膜(mo)層。

以(yi)上柔性(xing)單點力片式傳感器制(zhi)造方法，包括下(xia)述步驟：

a.先制備形狀大小(xiao)相同(tong)的(de)上基板和下基板，在上基板長度方(fang)向的(de)一側設置一凸起(qi)；在相對該凸起(qi)的(de)下基板上設置一凹陷(xian)；

b.將下基板1固定在絲網印(yin)(yin)(yin)刷機的印(yin)(yin)(yin)刷臺上，用(yong)導電料漿沿下基板長度方向從(cong)遠離凹陷(xian)一(yi)側到凹陷(xian)的上表面印(yin)(yin)(yin)制(zhi)兩(liang)條印(yin)(yin)(yin)刷電極，干燥后，在下基板遠離凹陷(xian)的一(yi)側設置兩(liang)個外露的電極引出片3。

c.在下(xia)基(ji)板凹陷中涂敷壓(ya)敏(min)電(dian)(dian)(dian)阻油墨，并放(fang)置一(yi)個(ge)壓(ya)敏(min)體(ti)(ti)，該壓(ya)敏(min)體(ti)(ti)上(shang)、下(xia)端面(mian)事(shi)先分(fen)(fen)別(bie)焊(han)接(jie)好兩個(ge)電(dian)(dian)(dian)極(ji)(ji)(ji)連(lian)接(jie)片9，位于壓(ya)敏(min)體(ti)(ti)上(shang)、下(xia)端面(mian)的(de)兩電(dian)(dian)(dian)極(ji)(ji)(ji)連(lian)接(jie)片9分(fen)(fen)別(bie)連(lian)接(jie)至位于下(xia)基(ji)板上(shang)的(de)兩條(tiao)(tiao)印(yin)刷電(dian)(dian)(dian)極(ji)(ji)(ji)6，兩條(tiao)(tiao)印(yin)刷電(dian)(dian)(dian)極(ji)(ji)(ji)6的(de)另一(yi)端連(lian)接(jie)外露(lu)的(de)兩個(ge)電(dian)(dian)(dian)極(ji)(ji)(ji)引出片3；同時，在上(shang)基(ji)板4的(de)凸起內表(biao)面(mian)上(shang)涂敷壓(ya)敏(min)電(dian)(dian)(dian)阻油墨。

d.在下基板的(de)兩條印(yin)刷電極6上從連(lian)接電極連(lian)接片9到連(lian)接電極引(yin)出片3的(de)一(yi)段上表面涂(tu)敷(fu)一(yi)層(ceng)電極保(bao)護膜并干燥。

e.將上(shang)、下基板用粘(zhan)接層復(fu)合，使(shi)所述凸起與(yu)(yu)凹陷之(zhi)間形成(cheng)一(yi)個的(de)(de)密閉壓敏體室，將壓敏體及電極連(lian)接片封裝在(zai)其內，壓敏體室的(de)(de)大小剛好(hao)與(yu)(yu)壓敏體的(de)(de)大小吻合，同時兩條印刷電極相互平行。

當上述絲網(wang)印(yin)刷單(dan)點力片(pian)式傳感(gan)器與(yu)外接(jie)電(dian)路(lu)連接(jie)并通過能正常工作的測試(shi)后，該傳感(gan)器外露部分電(dian)極引出片(pian)3與(yu)外接(jie)導線連接(jie)部分用絕(jue)緣(yuan)硅膠將(jiang)其(qi)覆蓋(gai)以防銀電(dian)極長(chang)期處(chu)于在空氣中被氧化(hua)而削弱或喪失了其(qi)導電(dian)性(xing)能。

本發明柔性單點力片式(shi)傳感器(qi)的(de)(de)(de)(de)檢測(ce)原理(li)如下：當處于點接觸狀(zhuang)態時(shi)物體間的(de)(de)(de)(de)一(yi)集中(zhong)載(zai)荷(集中(zhong)力)作用(yong)于壓敏(min)(min)電(dian)(dian)(dian)(dian)(dian)(dian)阻7上時(shi)，壓敏(min)(min)電(dian)(dian)(dian)(dian)(dian)(dian)阻因受到了(le)壓力作用(yong)便發生了(le)一(yi)定的(de)(de)(de)(de)壓縮變形，從而引起(qi)了(le)壓敏(min)(min)電(dian)(dian)(dian)(dian)(dian)(dian)阻值的(de)(de)(de)(de)變化，反(fan)映(ying)在電(dian)(dian)(dian)(dian)(dian)(dian)路上便是兩銀導電(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)極6之間電(dian)(dian)(dian)(dian)(dian)(dian)壓值的(de)(de)(de)(de)改變；根據壓敏(min)(min)電(dian)(dian)(dian)(dian)(dian)(dian)阻上電(dian)(dian)(dian)(dian)(dian)(dian)壓值相對于最(zui)初電(dian)(dian)(dian)(dian)(dian)(dian)壓值的(de)(de)(de)(de)變化量便可(ke)反(fan)映(ying)出點接觸處壓力或集中(zhong)載(zai)荷的(de)(de)(de)(de)大小。集中(zhong)載(zai)荷與(yu)(yu)(yu)軸向長度(du)、電(dian)(dian)(dian)(dian)(dian)(dian)阻阻值與(yu)(yu)(yu)軸向長度(du)的(de)(de)(de)(de)關(guan)(guan)系(xi)(xi)、電(dian)(dian)(dian)(dian)(dian)(dian)壓與(yu)(yu)(yu)電(dian)(dian)(dian)(dian)(dian)(dian)阻的(de)(de)(de)(de)關(guan)(guan)系(xi)(xi)如下：

ΔL=FLES---(1)

其中：L——壓敏電阻的原(yuan)始厚度(du)；

S——壓敏電(dian)阻的橫截(jie)面面積(ji)；

F——作用于(yu)壓敏電阻(zu)上的集中載荷(he)；

E——壓(ya)敏電阻的彈性模量；

ΔL——壓(ya)敏(min)電阻油(you)墨厚(hou)度的改變量。

R=ρLS---(2)

其中：L——壓(ya)敏(min)電阻油墨的厚(hou)度；

S——壓敏電阻油墨的橫截面(mian)面(mian)積；

ρ——壓(ya)敏電阻油墨的電阻率；

R——壓敏電(dian)阻油墨的電(dian)阻值(zhi)。

                U＝IR        (3)

其(qi)中：I——流經壓(ya)敏電(dian)阻(zu)的電(dian)流值；

R——壓敏電(dian)阻(zu)(zu)油墨的電(dian)阻(zu)(zu)值(zhi)；

U——壓敏(min)電阻油墨(mo)的(de)電壓值；

如圖(tu)4所示(shi)，絲網印刷單(dan)(dan)點(dian)力(li)(li)片式傳感(gan)器(qi)(qi)的(de)(de)(de)(de)(de)(de)(de)(de)壓(ya)(ya)(ya)(ya)(ya)敏(min)(min)(min)電(dian)(dian)阻(zu)因(yin)(yin)(yin)為只(zhi)受(shou)到(dao)(dao)軸向壓(ya)(ya)(ya)(ya)(ya)縮變(bian)(bian)(bian)(bian)(bian)形而(er)(er)引起(qi)了(le)(le)其(qi)(qi)阻(zu)值(zhi)的(de)(de)(de)(de)(de)(de)(de)(de)改(gai)(gai)變(bian)(bian)(bian)(bian)(bian)，因(yin)(yin)(yin)此在(zai)測量電(dian)(dian)路(lu)中(zhong)壓(ya)(ya)(ya)(ya)(ya)敏(min)(min)(min)電(dian)(dian)阻(zu)可(ke)(ke)以(yi)(yi)(yi)被(bei)當作(zuo)(zuo)電(dian)(dian)路(lu)中(zhong)的(de)(de)(de)(de)(de)(de)(de)(de)可(ke)(ke)變(bian)(bian)(bian)(bian)(bian)電(dian)(dian)阻(zu)對待；同時又(you)由于壓(ya)(ya)(ya)(ya)(ya)敏(min)(min)(min)電(dian)(dian)阻(zu)的(de)(de)(de)(de)(de)(de)(de)(de)改(gai)(gai)變(bian)(bian)(bian)(bian)(bian)引起(qi)了(le)(le)加在(zai)壓(ya)(ya)(ya)(ya)(ya)敏(min)(min)(min)電(dian)(dian)阻(zu)兩端(duan)(duan)電(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)值(zhi)的(de)(de)(de)(de)(de)(de)(de)(de)改(gai)(gai)變(bian)(bian)(bian)(bian)(bian)，因(yin)(yin)(yin)此壓(ya)(ya)(ya)(ya)(ya)敏(min)(min)(min)電(dian)(dian)阻(zu)端(duan)(duan)電(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)的(de)(de)(de)(de)(de)(de)(de)(de)改(gai)(gai)變(bian)(bian)(bian)(bian)(bian)可(ke)(ke)以(yi)(yi)(yi)被(bei)當作(zuo)(zuo)檢測電(dian)(dian)路(lu)的(de)(de)(de)(de)(de)(de)(de)(de)輸(shu)入(ru)變(bian)(bian)(bian)(bian)(bian)量信(xin)(xin)(xin)(xin)號(hao)(hao)。由于單(dan)(dan)點(dian)力(li)(li)傳感(gan)器(qi)(qi)的(de)(de)(de)(de)(de)(de)(de)(de)壓(ya)(ya)(ya)(ya)(ya)敏(min)(min)(min)電(dian)(dian)阻(zu)因(yin)(yin)(yin)外(wai)力(li)(li)作(zuo)(zuo)用而(er)(er)引起(qi)了(le)(le)加在(zai)其(qi)(qi)兩端(duan)(duan)電(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)的(de)(de)(de)(de)(de)(de)(de)(de)改(gai)(gai)變(bian)(bian)(bian)(bian)(bian)，反(fan)相(xiang)比(bi)(bi)例(li)(li)(li)放(fang)大(da)(da)(da)電(dian)(dian)路(lu)的(de)(de)(de)(de)(de)(de)(de)(de)輸(shu)入(ru)端(duan)(duan)恰好是壓(ya)(ya)(ya)(ya)(ya)敏(min)(min)(min)電(dian)(dian)阻(zu)端(duan)(duan)電(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)的(de)(de)(de)(de)(de)(de)(de)(de)改(gai)(gai)變(bian)(bian)(bian)(bian)(bian)端(duan)(duan)；因(yin)(yin)(yin)此壓(ya)(ya)(ya)(ya)(ya)敏(min)(min)(min)電(dian)(dian)阻(zu)端(duan)(duan)電(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)的(de)(de)(de)(de)(de)(de)(de)(de)改(gai)(gai)變(bian)(bian)(bian)(bian)(bian)必然(ran)(ran)引起(qi)了(le)(le)反(fan)相(xiang)比(bi)(bi)例(li)(li)(li)放(fang)大(da)(da)(da)電(dian)(dian)路(lu)I輸(shu)出(chu)電(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)值(zhi)的(de)(de)(de)(de)(de)(de)(de)(de)改(gai)(gai)變(bian)(bian)(bian)(bian)(bian)，也就是說單(dan)(dan)點(dian)力(li)(li)傳感(gan)器(qi)(qi)受(shou)外(wai)力(li)(li)作(zuo)(zuo)用是可(ke)(ke)以(yi)(yi)(yi)引起(qi)測量電(dian)(dian)路(lu)中(zhong)相(xiang)應電(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)的(de)(de)(de)(de)(de)(de)(de)(de)改(gai)(gai)變(bian)(bian)(bian)(bian)(bian)的(de)(de)(de)(de)(de)(de)(de)(de)。當外(wai)力(li)(li)作(zuo)(zuo)用于單(dan)(dan)點(dian)力(li)(li)傳感(gan)器(qi)(qi)后(hou)(hou)由于壓(ya)(ya)(ya)(ya)(ya)敏(min)(min)(min)電(dian)(dian)阻(zu)值(zhi)的(de)(de)(de)(de)(de)(de)(de)(de)改(gai)(gai)變(bian)(bian)(bian)(bian)(bian)而(er)(er)產生(sheng)了(le)(le)一定的(de)(de)(de)(de)(de)(de)(de)(de)微(wei)弱(ruo)電(dian)(dian)信(xin)(xin)(xin)(xin)號(hao)(hao)，通(tong)過(guo)(guo)(guo)反(fan)相(xiang)比(bi)(bi)例(li)(li)(li)放(fang)大(da)(da)(da)器(qi)(qi)I將(jiang)該(gai)信(xin)(xin)(xin)(xin)號(hao)(hao)放(fang)大(da)(da)(da)；然(ran)(ran)后(hou)(hou)再通(tong)過(guo)(guo)(guo)低(di)通(tong)濾波器(qi)(qi)將(jiang)其(qi)(qi)他高頻(pin)干擾信(xin)(xin)(xin)(xin)號(hao)(hao)過(guo)(guo)(guo)濾或(huo)(huo)者(zhe)去除；接(jie)(jie)著再通(tong)過(guo)(guo)(guo)反(fan)相(xiang)比(bi)(bi)例(li)(li)(li)放(fang)大(da)(da)(da)器(qi)(qi)II將(jiang)電(dian)(dian)信(xin)(xin)(xin)(xin)號(hao)(hao)還原到(dao)(dao)最初(chu)的(de)(de)(de)(de)(de)(de)(de)(de)相(xiang)位(wei)(因(yin)(yin)(yin)為前(qian)后(hou)(hou)經過(guo)(guo)(guo)了(le)(le)兩次反(fan)相(xiang)放(fang)大(da)(da)(da)，因(yin)(yin)(yin)此經過(guo)(guo)(guo)處(chu)理后(hou)(hou)的(de)(de)(de)(de)(de)(de)(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)可(ke)(ke)以(yi)(yi)(yi)恢復到(dao)(dao)原來的(de)(de)(de)(de)(de)(de)(de)(de)正電(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)值(zhi)，同時將(jiang)微(wei)弱(ruo)電(dian)(dian)信(xin)(xin)(xin)(xin)號(hao)(hao)值(zhi)放(fang)大(da)(da)(da)了(le)(le))；最后(hou)(hou)再通(tong)過(guo)(guo)(guo)A/D轉換(huan)(huan)器(qi)(qi)限壓(ya)(ya)(ya)(ya)(ya)轉換(huan)(huan)將(jiang)外(wai)力(li)(li)引起(qi)的(de)(de)(de)(de)(de)(de)(de)(de)并經過(guo)(guo)(guo)處(chu)理的(de)(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)信(xin)(xin)(xin)(xin)號(hao)(hao)轉換(huan)(huan)為計算機能識別的(de)(de)(de)(de)(de)(de)(de)(de)數字電(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)信(xin)(xin)(xin)(xin)號(hao)(hao)，當然(ran)(ran)也可(ke)(ke)以(yi)(yi)(yi)直接(jie)(jie)將(jiang)反(fan)相(xiang)比(bi)(bi)例(li)(li)(li)放(fang)大(da)(da)(da)器(qi)(qi)II處(chu)理后(hou)(hou)的(de)(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)信(xin)(xin)(xin)(xin)號(hao)(hao)直接(jie)(jie)輸(shu)入(ru)至可(ke)(ke)以(yi)(yi)(yi)接(jie)(jie)收該(gai)信(xin)(xin)(xin)(xin)號(hao)(hao)的(de)(de)(de)(de)(de)(de)(de)(de)模(mo)擬(ni)顯(xian)示(shi)儀器(qi)(qi)或(huo)(huo)處(chu)理儀器(qi)(qi)例(li)(li)(li)如模(mo)擬(ni)信(xin)(xin)(xin)(xin)號(hao)(hao)示(shi)波顯(xian)示(shi)器(qi)(qi)或(huo)(huo)者(zhe)模(mo)擬(ni)信(xin)(xin)(xin)(xin)號(hao)(hao)處(chu)理電(dian)(dian)路(lu)板。