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面议CS215环境温湿度传感器Campbell
面议美国Campbell环境温湿度传感器CS215
面议CR200X数据采集器美国Campbell
面议美国Campbell CR310数据采集器
面议HPV 茎流量传感器/Sap Flow Sensor
HPV茎流量传感器是一款校准型、低成本的热脉冲液流传感器,输出校准液流量、热速、茎水含量、茎温等数据,功耗低,内置加热控制,同时改善了传统的加热方式,其原理采用双方法(DMA)热脉冲法,测量范围:-200~+1000cm/hr(热流速度)或-100~+2000cm3/cm2/hr (茎流通量密度),可广泛用于于茎流量监测、植物茎流蒸发计算、植物茎流蒸腾量、植物灌溉等
植物茎流是树木内部的“水”运动,而蒸腾是从叶片通过光合作用蒸发流出的水分。树液流量和蒸腾量之间有很强的关联性,通常理解是同一回事。但是,严格地说,它们是不同的,这体现在它们是如何被测量的。
SAP流量以L/hr(或每天、每周等)为单位进行测量。蒸腾量以每小时、每天、每星期等毫米(mm)为单位测量。
蒸散量=蒸腾量+蒸发量
蒸腾量以毫米为测量单位,可与降雨量以毫米计作比较。随着时间的推移,降雨量(水输入)应与蒸腾量(输出)相匹配。如果蒸腾作用更高,通常是树木作物的蒸腾作用,那么这种差异必须通过灌溉来弥补。
蒸发量(evaporation),蒸发量是指在一定时段内,由土壤或水中的水分经蒸发而散布到空中的量。
1mm(降雨量)=1㎡地面1kg水
1mm(蒸腾量)=1㎡叶面积的1升树液流量(水)
例如:在果园和葡萄园等有管理的树木作物系统中,蒸发量与蒸腾量相比非常小。因此,为了简化测量,通常忽略蒸发量,将蒸腾量取为平均蒸散量(ETo)。
茎流量传感器广泛应用
计算总流量
低液流和零液流速率
反向液流速率
夜间水分损失
根茎液流速度
贫瘠生态系统及干旱
径向液体流速
葡萄藤的液流
茎流量传感器 技术指标
测量范围:-200~+1000cm/hr(热流速度)
分辨率:0.001cm/hr
准确度:±0.1cm/hr
探针尺寸:φ1.3mm*L30mm
温度位置:外10mm,内20mm
针距:6mm
探针材质:316不锈钢
温度范围:-30~+70℃
响应时间:200ms
加热电阻:39Ω,400J/m
电源:12V DC
电流:空闲5mA, 测量<270mA
线缆:5m,*大60m
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