一、土壤熱通量傳感器產品概述

土(tu)(tu)壤(rang)熱(re)(re)(re)通(tong)(tong)(tong)(tong)量(liang)(liang)(liang)傳(chuan)感(gan)器(qi)又(you)稱(cheng)熱(re)(re)(re)流(liu)計，土(tu)(tu)壤(rang)熱(re)(re)(re)通(tong)(tong)(tong)(tong)量(liang)(liang)(liang)傳(chuan)感(gan)器(qi)是一款測(ce)(ce)(ce)量(liang)(liang)(liang)熱(re)(re)(re)通(tong)(tong)(tong)(tong)量(liang)(liang)(liang)的傳(chuan)感(gan)器(qi)，可用(yong)來測(ce)(ce)(ce)量(liang)(liang)(liang)土(tu)(tu)壤(rang)熱(re)(re)(re)通(tong)(tong)(tong)(tong)量(liang)(liang)(liang)，墻體(ti)熱(re)(re)(re)通(tong)(tong)(tong)(tong)量(liang)(liang)(liang)，建(jian)筑(zhu)(zhu)內(nei)部熱(re)(re)(re)通(tong)(tong)(tong)(tong)量(liang)(liang)(liang)，尤其(qi)適(shi)用(yong)于能量(liang)(liang)(liang)平衡(heng)研(yan)究(jiu)和波文比(bi)系統(tong)。土(tu)(tu)壤(rang)熱(re)(re)(re)通(tong)(tong)(tong)(tong)量(liang)(liang)(liang)傳(chuan)感(gan)器(qi)又(you)稱(cheng)作(zuo)熱(re)(re)(re)流(liu)板、土(tu)(tu)壤(rang)熱(re)(re)(re)通(tong)(tong)(tong)(tong)量(liang)(liang)(liang)板、熱(re)(re)(re)流(liu)計等名稱(cheng)，是用(yong)來測(ce)(ce)(ce)量(liang)(liang)(liang)熱(re)(re)(re)通(tong)(tong)(tong)(tong)量(liang)(liang)(liang)的儀器(qi)，可以(yi)用(yong)于土(tu)(tu)壤(rang)內(nei)部測(ce)(ce)(ce)量(liang)(liang)(liang)。它通(tong)(tong)(tong)(tong)過一個(ge)熱(re)(re)(re)電堆，以(yi)電壓形(xing)式輸出，電壓正(zheng)比(bi)于熱(re)(re)(re)通(tong)(tong)(tong)(tong)量(liang)(liang)(liang)，它容易(yi)操作(zuo)，特別適(shi)用(yong)于測(ce)(ce)(ce)量(liang)(liang)(liang)土(tu)(tu)壤(rang)和建(jian)筑(zhu)(zhu)墻體(ti)、玻璃墻體(ti)的熱(re)(re)(re)導率。利用(yong)埋在土(tu)(tu)中2cm處(chu)的熱(re)(re)(re)通(tong)(tong)(tong)(tong)量(liang)(liang)(liang)板所(suo)測(ce)(ce)(ce)量(liang)(liang)(liang)得到的土(tu)(tu)壤(rang)熱(re)(re)(re)通(tong)(tong)(tong)(tong)量(liang)(liang)(liang)值(zhi)(zhi)。一年(nian)當(dang)中，它是隨著季節的變化而變化，夏季土(tu)(tu)壤(rang)熱(re)(re)(re)通(tong)(tong)(tong)(tong)量(liang)(liang)(liang)為(wei)正(zheng)值(zhi)(zhi)，既(ji)有熱(re)(re)(re)量(liang)(liang)(liang)進入土(tu)(tu)壤(rang)層中，而且(qie)量(liang)(liang)(liang)值(zhi)(zhi)較大；冬季則土(tu)(tu)壤(rang)熱(re)(re)(re)通(tong)(tong)(tong)(tong)量(liang)(liang)(liang)為(wei)負值(zhi)(zhi)，土(tu)(tu)壤(rang)中的熱(re)(re)(re)量(liang)(liang)(liang)向大氣釋放，但量(liang)(liang)(liang)值(zhi)(zhi)較小(xiao)。

二、土(tu)壤熱通量傳感(gan)器適用范圍

本品可廣泛用環境(jing)、農業(ye)、林業(ye)、種植、建筑、等領域。

三、土(tu)壤(rang)熱(re)通(tong)量傳感器技術參數

供電電壓：□12-24V□5V

輸(shu)出信號(hao)：□電流(liu)型4～20mA□0-2V□RS485定制(zhi)

測量(liang)范圍：-200至200 w/m2

內阻小于300Ω

測量精度：小于5%

熱流計算公式

熱流量（w/m2）=系數（w*m-2/mv）*輸出（mv）

工作電(dian)流:12V上電(dian)約26mA

四、土壤(rang)熱通(tong)量傳感器(qi)功(gong)能特(te)點

1.體積(ji)小巧，測量(liang)快速準確(que)

2.低(di)功耗(hao)設(she)計，采(cai)用合理的功耗(hao)控制模式

3.性能穩定

五、土壤熱通量傳感(gan)器測量方法

1.土壤中測量方法

應該使板面(mian)(mian)與(yu)熱流量方向(xiang)相垂直(zhi)(zhi)，水平放置于土壤(rang)層中。傳感(gan)(gan)器的(de)(de)埋設深(shen)度，通常(chang)是(shi)距自然下墊(dian)面(mian)(mian)3-10厘米深(shen)處，應盡量避免(mian)直(zhi)(zhi)接設置在土層表(biao)面(mian)(mian)，因為自然下墊(dian)面(mian)(mian)并(bing)非幾何平面(mian)(mian)，表(biao)面(mian)(mian)的(de)(de)微小起(qi)伏將使傳感(gan)(gan)器讀數失去代表(biao)性(xing)，同時傳感(gan)(gan)器的(de)(de)上(shang)表(biao)面(mian)(mian)直(zhi)(zhi)接與(yu)空氣接觸也(ye)可能產生(sheng)輻射誤差(cha)。通常(chang)在觀測(ce)場地選擇一塊具(ju)有(you)代表(biao)性(xing)的(de)(de)地段，用鏟刀垂直(zhi)(zhi)向(xiang)下挖(wa)一剖面(mian)(mian)，

從土壤表面(mian)(mian)向下沿(yan)剖(pou)面(mian)(mian)量(liang)出(chu)所需要的(de)深(shen)(shen)度，然后沿(yan)水平(ping)方(fang)向掏空，其(qi)大小正好可(ke)以(yi)放置熱流板(ban)，并使(shi)傳感器(qi)的(de)上下兩(liang)側(ce)面(mian)(mian)能與土壤保持良好的(de)接觸，將導(dao)線沿(yan)剖(pou)面(mian)(mian)引出(chu)再(zai)將土壤回填。但要注意(yi)，熱流板(ban)的(de)埋設深(shen)(shen)度應該是其(qi)中心線與土壤表面(mian)(mian)的(de)距離。

2.墻面上測量方法

首(shou)先(xian)將熱(re)流(liu)傳(chuan)感器(qi)表面均勻(yun)涂上凡(fan)士林，將涂有凡(fan)士林的熱(re)流(liu)傳(chuan)感器(qi)貼在墻(qiang)體表面，使墻(qiang)體和熱(re)流(liu)傳(chuan)感器(qi)能夠進行緊(jin)密(mi)接觸，停留幾分鐘后(hou)，待熱(re)流(liu)傳(chuan)感器(qi)適應環境溫度后(hou)可開(kai)始測量(liang)。