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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、莖溫等數據,功耗低,內置加熱控制,同時改善了傳統的加熱方式,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測、植物莖流蒸發計算、植物莖流蒸騰量、植物灌溉等
植物莖流是樹木內部的“水”運動,而蒸騰是從葉片通過光合作用蒸發流出的水分。樹液流量和蒸騰量之間有很強的關聯性,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。
蒸發量(evaporation),蒸發量是指在一定時段內,由土壤或水中的水分經蒸發而散布到空中的量。
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中,蒸發量與蒸騰量相比非常小。因此,為了簡化測量,通常忽略蒸發量,將蒸騰量取為平均蒸散量(ETo)。
技術指標
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20mm
針距:6mm
探針材質: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
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