光纖光柵混凝(ning)土表(biao)面(mian)標(biao)(biao)準(zhun)型應(ying)變計主(zhu)要用(yong)(yong)(yong)于混凝(ning)土表(biao)面(mian)的(de)應(ying)力應(ying)變監(jian)(jian)測(ce)，也用(yong)(yong)(yong)于對各種(zhong)金屬或其他固體結構(gou)表(biao)面(mian)進行靜(jing)態和動態應(ying)力應(ying)變監(jian)(jian)測(ce)。產(chan)品(pin)(pin)采用(yong)(yong)(yong)特(te)有(you)(you)的(de)彈性(xing)(xing)梁(liang)結構(gou)，具有(you)(you)較高(gao)的(de)測(ce)量分辨率和測(ce)量。現場安裝(zhuang)時先在(zai)混凝(ning)土表(biao)面(mian)打(da)四個鉆孔，然后(hou)采用(yong)(yong)(yong)緊固螺釘將(jiang)(jiang)底座固定在(zai)混凝(ning)土表(biao)面(mian)，通過(guo)螺母將(jiang)(jiang)傳感(gan)器方便地固定在(zai)底座上(shang)，亦(yi)可通過(guo)焊(han)接或粘貼方式將(jiang)(jiang)傳感(gan)器固定在(zai)結構(gou)表(biao)面(mian)。產(chan)品(pin)(pin)符(fu)合國家建(jian)筑工業(ye)行業(ye)標(biao)(biao)準(zhun)JG/T422-2013。產(chan)品(pin)(pin)特(te)點，安裝(zhuang)方便，既可進行監(jian)(jian)測(ce)，又可在(zai)短期監(jian)(jian)測(ce)，能(neng)重(zhong)復使用(yong)(yong)(yong)；適用(yong)(yong)(yong)于環境(jing)溫度變化(hua)小的(de)工程(cheng)，占用(yong)(yong)(yong)波長(chang)(chang)帶寬資源少(shao)，批量實用(yong)(yong)(yong)性(xing)(xing)高(gao)，節省項目整體成本；尾纖采用(yong)(yong)(yong)PU披(pi)覆鎧裝(zhuang)光纜(lan)，具有(you)(you)優異的(de)耐溫性(xing)(xing)能(neng)和耐腐蝕、耐老(lao)化(hua)性(xing)(xing)能(neng)，適應(ying)野外(wai)存活環境(jing)；穩定性(xing)(xing)好、可靠性(xing)(xing)高(gao)。埋(mai)入式振(zhen)弦(xian)應(ying)變計集成有(you)(you)溫度傳感(gan)器。長(chang)(chang)春振(zhen)弦(xian)式土壓力應(ying)變計哪家好

振弦(xian)(xian)(xian)式(shi)應變(bian)(bian)計(ji)使用指南：1.測量(liang)(liang)，測量(liang)(liang)振弦(xian)(xian)(xian)式(shi)應變(bian)(bian)計(ji)先將測量(liang)(liang)線(xian)(xian)(xian)連接(jie)振弦(xian)(xian)(xian)讀數(shu)儀(yi)，將各色夾子對(dui)(dui)應連接(jie)上應變(bian)(bian)計(ji)的(de)輸出電(dian)(dian)(dian)(dian)纜，黑、紅(hong)測頻率，白、綠測溫度(du)。振弦(xian)(xian)(xian)式(shi)應變(bian)(bian)計(ji)內附有(you)智(zhi)能識別(bie)芯(xin)(xin)片，其內存貯有(you)該應變(bian)(bian)計(ji)的(de)編號、系數(shu)K、溫度(du)修正系數(shu)b等(deng)信(xin)息。用讀數(shu)儀(yi)測量(liang)(liang)時會自動將識別(bie)信(xin)息讀出，順(shun)序存入讀數(shu)儀(yi)內，通訊給計(ji)算(suan)機(ji)，方(fang)便快速統計(ji)計(ji)算(suan)及(ji)查詢(xun)，使測量(liang)(liang)實現(xian)人工智(zhi)能無紙化操(cao)作。工程現(xian)場多支(zhi)應變(bian)(bian)計(ji)電(dian)(dian)(dian)(dian)纜被(bei)意外(wai)挖(wa)斷，用讀數(shu)儀(yi)測量(liang)(liang)一遍，自動識別(bie)出每支(zhi)應變(bian)(bian)計(ji)所對(dui)(dui)應的(de)編號及(ji)身(shen)份(fen)信(xin)息。2.應變(bian)(bian)計(ji)故(gu)障排查，當振弦(xian)(xian)(xian)式(shi)應變(bian)(bian)計(ji)測量(liang)(liang)出現(xian)故(gu)障時，可用萬(wan)用表(biao)檢查應變(bian)(bian)計(ji)芯(xin)(xin)線(xian)(xian)(xian)間(jian)的(de)電(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)(zu)值(zhi)(zhi)，其正常(chang)狀(zhuang)況紅(hong)、黑芯(xin)(xin)線(xian)(xian)(xian)電(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)(zu)值(zhi)(zhi)通常(chang)為300Ω左(zuo)右；綠、白芯(xin)(xin)線(xian)(xian)(xian)電(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)(zu)值(zhi)(zhi)在溫度(du)25℃時應為3kΩ左(zuo)右；紅(hong)、黑線(xian)(xian)(xian)對(dui)(dui)綠、白線(xian)(xian)(xian)或對(dui)(dui)屏蔽線(xian)(xian)(xian)(裸線(xian)(xian)(xian))間(jian)絕緣電(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)(zu)值(zhi)(zhi)應﹥50MΩ(測量(liang)(liang)絕緣電(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)(zu)時可使用100V直流兆歐(ou)表(biao)，萬(wan)用表(biao)測量(liang)(liang)絕緣電(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)(zu)應用MΩ檔，其值(zhi)(zhi)應為無窮大∞)。天津振弦(xian)(xian)(xian)式(shi)埋入式(shi)應變(bian)(bian)計(ji)好(hao)不好(hao)表(biao)貼(tie)式(shi)應變(bian)(bian)計(ji)為振弦(xian)(xian)(xian)式(shi)彈性(xing)梁結構，適用于焊接(jie)到(dao)各種(zhong)鋼結構的(de)場合(he)。

常用的電阻應變計：1、短接式應變計，短接式應變計也有紙基和膠基等種類。短接式應變計由于在橫向用粗銅導線短接，因而橫向效應系數很小(<0.1%)，這是短接式應變計的較大優點。另外，在制造過程中敏感柵的形狀較易保證，故測量精度高。但由于它的焊點多，焊點處截面變化劇烈，因而這種應變計疲勞壽命短。2、金屬箔式應變計，箔式應變計的敏感柵是用厚度為0.002～0.005毫米的銅鎳合金或鎳鉻合金的金屬箔，采用刻圖、制版、光刻及腐蝕等工藝過程而制成。基底是在箔的另一面涂上樹脂膠，經過加溫聚合而成，基底的厚度一般為0.03～0.05mm。

振(zhen)弦(xian)式(shi)應(ying)(ying)變(bian)計(ji)(ji)可測(ce)量(liang)鋼(gang)或混凝(ning)土結(jie)(jie)構的(de)(de)(de)(de)(de)應(ying)(ying)變(bian)，測(ce)量(liang)值用(yong)于(yu)計(ji)(ji)算(suan)結(jie)(jie)構荷載或應(ying)(ying)力。應(ying)(ying)變(bian)計(ji)(ji)可通(tong)過電(dian)弧焊(han)接端(duan)(duan)塊固定(ding)在(zai)(zai)鋼(gang)結(jie)(jie)構上，在(zai)(zai)混凝(ning)土表面，則可以通(tong)過安裝塊（包括(kuo)鋼(gang)筋螺(luo)栓(shuan)）安裝。埋入(ru)式(shi)應(ying)(ying)變(bian)計(ji)(ji)澆鑄在(zai)(zai)混凝(ning)土結(jie)(jie)構中(zhong)，也可作為“噴漿(jiang)混凝(ning)土”模型(xing)，帶有可調的(de)(de)(de)(de)(de)張緊(jin)(jin)環。對于(yu)混凝(ning)土的(de)(de)(de)(de)(de)高壓(ya)力，例(li)如在(zai)(zai)深(shen)樁(zhuang)中(zhong)，建議使用(yong)埋入(ru)式(shi)應(ying)(ying)變(bian)計(ji)(ji)進行深(shen)部應(ying)(ying)用(yong)。工作原理，張緊(jin)(jin)的(de)(de)(de)(de)(de)鋼(gang)弦(xian)在(zai)(zai)拉動時(shi)會(hui)以其(qi)共振(zhen)頻率(lv)振(zhen)動，這(zhe)個頻率(lv)的(de)(de)(de)(de)(de)平方與(yu)(yu)鋼(gang)弦(xian)的(de)(de)(de)(de)(de)應(ying)(ying)變(bian)成正比。為了利用(yong)這(zhe)一原理，振(zhen)弦(xian)式(shi)應(ying)(ying)變(bian)計(ji)(ji)被設計(ji)(ji)為在(zai)(zai)固定(ding)結(jie)(jie)構上的(de)(de)(de)(de)(de)兩個端(duan)(duan)塊之間保(bao)持鋼(gang)弦(xian)的(de)(de)(de)(de)(de)張力，一個電(dian)磁線圈組件被用(yong)來激勵鋼(gang)弦(xian)，然后將頻率(lv)信號(hao)返(fan)回(hui)給讀(du)數(shu)(shu)單(dan)元。結(jie)(jie)構的(de)(de)(de)(de)(de)變(bian)形會(hui)改變(bian)兩個端(duan)(duan)塊之間的(de)(de)(de)(de)(de)距(ju)離，從而改變(bian)鋼(gang)弦(xian)的(de)(de)(de)(de)(de)張力及其(qi)共振(zhen)頻率(lv)。返(fan)回(hui)的(de)(de)(de)(de)(de)信號(hao)轉換為微應(ying)(ying)變(bian)單(dan)位(wei)。而應(ying)(ying)變(bian)計(ji)(ji)可在(zai)(zai)距(ju)其(qi)位(wei)置1000米的(de)(de)(de)(de)(de)范圍內進行數(shu)(shu)據(ju)讀(du)取。應(ying)(ying)變(bian)計(ji)(ji)具有內置的(de)(de)(de)(de)(de)熱(re)(re)敏電(dian)阻(zu)，可在(zai)(zai)必要時(shi)提供溫度數(shu)(shu)據(ju)以檢測(ce)熱(re)(re)效(xiao)應(ying)(ying)。應(ying)(ying)變(bian)計(ji)(ji)的(de)(de)(de)(de)(de)安裝均應(ying)(ying)保(bao)持與(yu)(yu)支撐(cheng)軸(zhou)線平行。

金屬電阻(zu)應(ying)(ying)(ying)變(bian)(bian)(bian)計(ji)還可(ke)以(yi)按敏感(gan)(gan)柵(zha)的結構形(xing)狀分為下(xia)(xia)述幾(ji)類：(1)單(dan)(dan)(dan)軸(zhou)(zhou)應(ying)(ying)(ying)變(bian)(bian)(bian)計(ji)：單(dan)(dan)(dan)軸(zhou)(zhou)應(ying)(ying)(ying)變(bian)(bian)(bian)計(ji)一(yi)般(ban)是指(zhi)具(ju)有一(yi)個(ge)敏感(gan)(gan)柵(zha)的應(ying)(ying)(ying)變(bian)(bian)(bian)計(ji)。這種應(ying)(ying)(ying)變(bian)(bian)(bian)計(ji)可(ke)用(yong)來(lai)測量單(dan)(dan)(dan)向(xiang)應(ying)(ying)(ying)變(bian)(bian)(bian)。(2)單(dan)(dan)(dan)軸(zhou)(zhou)多(duo)(duo)柵(zha)應(ying)(ying)(ying)變(bian)(bian)(bian)計(ji)：把幾(ji)個(ge)單(dan)(dan)(dan)軸(zhou)(zhou)敏感(gan)(gan)柵(zha)粘(zhan)貼在(zai)同(tong)一(yi)個(ge)基底(di)上(shang)，可(ke)構成(cheng)平(ping)行軸(zhou)(zhou)多(duo)(duo)柵(zha)和同(tong)軸(zhou)(zhou)多(duo)(duo)柵(zha)，這種應(ying)(ying)(ying)變(bian)(bian)(bian)計(ji)可(ke)方便地測量構件(jian)表面(mian)(mian)的應(ying)(ying)(ying)變(bian)(bian)(bian)梯度(du)。(3)應(ying)(ying)(ying)變(bian)(bian)(bian)花(hua)(hua)(多(duo)(duo)軸(zhou)(zhou)應(ying)(ying)(ying)變(bian)(bian)(bian)計(ji))：具(ju)有兩(liang)個(ge)或(huo)兩(liang)個(ge)以(yi)上(shang)軸(zhou)(zhou)線相交成(cheng)一(yi)定(ding)角度(du)的敏感(gan)(gan)柵(zha)制成(cheng)的應(ying)(ying)(ying)變(bian)(bian)(bian)計(ji)稱為多(duo)(duo)軸(zhou)(zhou)應(ying)(ying)(ying)變(bian)(bian)(bian)計(ji)，也稱為應(ying)(ying)(ying)變(bian)(bian)(bian)花(hua)(hua)其敏感(gan)(gan)柵(zha)可(ke)由金屬絲或(huo)金屬箔制成(cheng)。采用(yong)應(ying)(ying)(ying)變(bian)(bian)(bian)花(hua)(hua)可(ke)方便地測定(ding)平(ping)面(mian)(mian)應(ying)(ying)(ying)變(bian)(bian)(bian)狀態下(xia)(xia)構件(jian)上(shang)某一(yi)點處的應(ying)(ying)(ying)變(bian)(bian)(bian)。應(ying)(ying)(ying)變(bian)(bian)(bian)計(ji)在(zai)使用(yong)前，要(yao)用(yong)脫脂棉浸無(wu)水(shui)乙醇擦洗，注意兩(liang)面(mian)(mian)都要(yao)清洗。長春(chun)振弦式土(tu)壓力應(ying)(ying)(ying)變(bian)(bian)(bian)計(ji)哪家好

為保證(zheng)應變計(ji)粘貼位(wei)置的準確，可用無(wu)油圓(yuan)珠筆芯或劃針在(zai)貼片(pian)部位(wei)輕(qing)輕(qing)劃出定(ding)位(wei)線。長(chang)春(chun)振弦式(shi)土壓力(li)應變計(ji)哪家(jia)好

雙層(ceng)應(ying)(ying)(ying)變(bian)(bian)(bian)(bian)(bian)計(ji)(ji)(ji)，在(zai)(zai)(zai)進行薄(bo)殼、薄(bo)板(ban)應(ying)(ying)(ying)變(bian)(bian)(bian)(bian)(bian)的(de)測量時(shi)，需要在(zai)(zai)(zai)殼和板(ban)的(de)內、外(wai)表(biao)(biao)面(mian)(mian)對稱貼片(pian)。而對于體(ti)積小或密封的(de)結(jie)構在(zai)(zai)(zai)內表(biao)(biao)面(mian)(mian)貼片(pian)幾乎是無法(fa)進行的(de)，雙層(ceng)應(ying)(ying)(ying)變(bian)(bian)(bian)(bian)(bian)計(ji)(ji)(ji)為解(jie)決這些問(wen)題提供了條(tiao)件。在(zai)(zai)(zai)不太厚的(de)塑料(liao)上、下(xia)表(biao)(biao)面(mian)(mian)粘貼應(ying)(ying)(ying)變(bian)(bian)(bian)(bian)(bian)計(ji)(ji)(ji)，并在(zai)(zai)(zai)應(ying)(ying)(ying)變(bian)(bian)(bian)(bian)(bian)計(ji)(ji)(ji)表(biao)(biao)面(mian)(mian)涂(tu)環(huan)氧樹脂保(bao)護(hu)層(ceng)。使用時(shi)將此雙層(ceng)應(ying)(ying)(ying)變(bian)(bian)(bian)(bian)(bian)計(ji)(ji)(ji)粘貼在(zai)(zai)(zai)被(bei)測構件的(de)外(wai)表(biao)(biao)面(mian)(mian)，利用彎曲(qu)應(ying)(ying)(ying)變(bian)(bian)(bian)(bian)(bian)線性分布及軸向應(ying)(ying)(ying)變(bian)(bian)(bian)(bian)(bian)均勻分布特(te)點，同時(shi)測出彎曲(qu)及軸向應(ying)(ying)(ying)變(bian)(bian)(bian)(bian)(bian)。防水(shui)(shui)應(ying)(ying)(ying)變(bian)(bian)(bian)(bian)(bian)計(ji)(ji)(ji)，在(zai)(zai)(zai)潮濕環(huan)境(jing)或水(shui)(shui)下(xia)，特(te)別在(zai)(zai)(zai)高水(shui)(shui)壓作用下(xia)，應(ying)(ying)(ying)采用防水(shui)(shui)應(ying)(ying)(ying)變(bian)(bian)(bian)(bian)(bian)計(ji)(ji)(ji)。常溫(wen)短期(qi)水(shui)(shui)下(xia)應(ying)(ying)(ying)變(bian)(bian)(bian)(bian)(bian)量測可在(zai)(zai)(zai)箔式應(ying)(ying)(ying)變(bian)(bian)(bian)(bian)(bian)計(ji)(ji)(ji)表(biao)(biao)面(mian)(mian)涂(tu)防護(hu)層(ceng)(如水(shui)(shui)下(xia)環(huan)氧樹脂)。長(chang)期(qi)量測可用熱塑方法(fa)將應(ying)(ying)(ying)變(bian)(bian)(bian)(bian)(bian)計(ji)(ji)(ji)夾在(zai)(zai)(zai)兩塊薄(bo)塑料(liao)板(ban)中間，或采用防水(shui)(shui)、防霉、防腐(fu)蝕的(de)特(te)種膠材料(liao)作為應(ying)(ying)(ying)變(bian)(bian)(bian)(bian)(bian)計(ji)(ji)(ji)的(de)基底(di)和覆蓋(gai)層(ceng)制成防水(shui)(shui)應(ying)(ying)(ying)變(bian)(bian)(bian)(bian)(bian)計(ji)(ji)(ji)。長(chang)春振弦式土壓力應(ying)(ying)(ying)變(bian)(bian)(bian)(bian)(bian)計(ji)(ji)(ji)哪家好

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