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HPV 莖流量傳感器/Sap Flow Sensor
HPV莖流量傳感器是一款校準型、低成本的熱脈沖液流傳感器,,輸出校準液流量,、熱速、莖水含量,、莖溫等數(shù)據(jù),,功耗低,內(nèi)置加熱控制,,同時改善了傳統(tǒng)的加熱方式,,其原理采用熱脈沖速率法(HPV),測量范圍:-200~+1000cm/hr(熱流速度)或-100~+2000cm3/cm2/hr (莖流通量密度),,可廣泛用于于莖流量監(jiān)測,、植物莖流蒸發(fā)計算、植物莖流蒸騰量,、植物灌溉等
植物莖流是樹木內(nèi)部的“水”運動,,而蒸騰是從葉片通過光合作用蒸發(fā)流出的水分。樹液流量和蒸騰量之間有很強的關聯(lián)性,,通常理解是同一回事,。但是,嚴格地說,,它們是不同的,,這體現(xiàn)在它們是如何被測量的,。
SAP流量以L/hr(或每天、每周等)為單位進行測量,。蒸騰量以每小時,、每天、每星期等毫米(mm)為單位測量,。
蒸散量=蒸騰量+蒸發(fā)量
蒸騰量以毫米為測量單位,,可與降雨量以毫米計作比較。隨著時間的推移,,降雨量(水輸入)應與蒸騰量(輸出)相匹配,。如果蒸騰作用更高,,通常是樹木作物的蒸騰作用,,那么這種差異必須通過灌溉來彌補。
蒸發(fā)量(evaporation),,蒸發(fā)量是指在一定時段內(nèi),,由土壤或水中的水分經(jīng)蒸發(fā)而散布到空中的量。
1mm(降雨量)=1㎡地面1kg水
1mm(蒸騰量)=1㎡葉面積的1升樹液流量(水)
例如:在果園和葡萄園等有管理的樹木作物系統(tǒng)中,,蒸發(fā)量與蒸騰量相比非常小,。因此,為了簡化測量,,通常忽略蒸發(fā)量,,將蒸騰量取為平均蒸散量(ETo)。
技術(shù)指標
測量范圍:-200~+1000cm/hr(熱流速度)
分辨率:0.001cm/hr
準確度:±0.1cm/hr
探針尺寸:φ1.3mm*L30mm
溫度位置:外10mm,,內(nèi)20mm
針距:6mm
探針材質(zhì):316不銹鋼
溫度范圍:-30~+70℃
響應時間:200ms
加熱電阻:39Ω,,400J/m
電源:12V DC
電流:空閑5mA, 測量<270mA
信號輸出:SDI-12
線纜:5m,,Max 60m
莖流量傳感器參考文獻:
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