辐射热流传感器

HPV 茎流量传感器/Sap Flow SensorHPV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）。 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信号输出：SDI-12线缆：5m，最大60m茎流量传感器参考文献：1. Kim, H.K. Park, J. Hwang, I. Investigating water transport through the xylem network in vascular plants.J. Exp. Bot. 2014, 65, 1895–1904. [CrossRef] [PubMed]2. 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A comparison of sap flux density using thermaldissipation, heat pulse velocity and heat field deformation methods. Agric. For. Meteorol. 2010 , 150, 1046–1056. [CrossRef]30. López-Bernal, A. Testi, L. Villalobos, F.J. A single-probe heat pulse method for estimating sap velocity in trees. New Phytol. 2017, 216, 321–329. [CrossRef] [PubMed]31. Forster, M.A. How significant is nocturnal sap flow? Tree Physiol. 2014, 34, 757–765. [CrossRef] [PubMed]32. Cohen, Y. Fuchs, M. Falkenflug, V. Moreshet, S. Calibrated heat pulse method for determining water uptake in cotton. Agron. J. 1988, 80, 398–402. [CrossRef]33. Cohen, Y. Takeuchi, S. Nozaka, J. Yano, T. Accuracy of sap flow measurement using heat balance and heat pulse methods. Agron. J. 1993, 85, 1080–1086. [CrossRef]34. Lassoie, J.P. Scott, D.R.M. Fritschen, L.J. Transpiration studies in Douglas-fir using the heat pulse technique. For. Sci. 1977, 23, 377–390.35. Wang, S. Fan, J. Wang, Q. Determining evapotranspiration of a Chinese Willow stand with three-needleheat-pulse probes. Soil Sci. Soc. Am. J. 2015, 79, 1545–1555. [CrossRef]36. Bleby, T.M. Burgess, S.S.O. Adams, M.A. A validation, comparison and error analysis of two heat-pulse methods for measuring sap flow in Eucalyptus marginata saplings. Funct. Plant Biol. 2004 , 31, 645–658.[CrossRef]37. Madurapperuma, W.S. Bleby, T.M. Burgess, S.S.O. Evaluation of sap flow methods to determine water use by cultivated palms. Environ. Exp. Bot. 2009, 66, 372–380. [CrossRef]38. Green, S.R. Measurement and modelling the transpiration of fruit trees and grapevines for irrigationscheduling. Acta Hortic. 2008, 792, 321–332. [CrossRef]39. Intrigliolo, D.S. Lakso, A.N. Piccioni, R.M. Grapevine cv. ‘Riesling’ water use in the northeastern UnitedStates. Irrig. Sci. 2009, 27, 253–262. [CrossRef]40. Eliades, M. Bruggeman, A. Djuma, H. Lubczynski, M. Tree water dynamics in a semi-arid, Pinus brutiaforest. Water 2018, 10, 1039. 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[CrossRef]创新点：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。HPV 植物茎流传感器/植物液流计

近日，由上海测振自主研发的YDYT9800一体化电涡流传感器成功试用负600米深海作业。YDYT9800一体化电涡流传感器电涡流传感器能静态和动态地非接触、高线性度、高分辨力测量金属导体距探头表面的距离，它是一种非接触线性化计量工具，被广泛应用在机械、航空、汽车、电力、石油、化工、冶金等行业。其中，深海作业对电涡流传感器的壳体、探头、接头、电缆等都有非常高的品质要求。电涡流传感器在深海作业过程中，因所处环境较为恶劣，极有可能出现个类故障，造成经济损失甚至重大事故。上海测振的技术研发团队经多次试验，最终攻克超高水压密封、高腐蚀环境、复杂电磁干扰等难题，通过微型封装技术把前置器内置探头内部，完成探头与前置器融为一体化方案，可满足深海领域的使用环境要求。作为深海领域传感器的代表作，YDYT9800一体化电涡流传感器采用耐腐蚀、耐水解的壳体、探头、接头、电缆等，防水及密封性能强，可在恶劣环境下长期稳定工作，此外，还具有安装使用方便、非接触测量等优势，是一种高性能、低成本的新型电涡流位移传感器，可对厚度、速度、位移、转速、应力、表面温度、材料损伤等进行持续不间断的测量。当前传感器国产化需求加重，国内传感器正在趋向技术化、创新化、自主研发化路线发展。YDYT9800一体化电涡流传感器的成功研发，正表明了我国传感器技术在不断突破，同时也将助推我国深海工业领域的不断发展。关于上海测振：上海测振自动化仪器有限公司（简称“上海测振”）成立于2006年，专业从事研发和生产振动传感器、位移传感器、转速传感器以及工业监控保护仪器，具有自营进出口贸易权。主要经营的产品有电涡流位移传感器，振动传感器，转速传感器及其配套仪器仪表四大类，包括四十多个不同型号，其中YD9200A、CZ9300、YDYT9800、YD260、YD280为国内首次推出。产品覆盖军工、重工、科研、教育等各个领域，与中国航空工业集团、沈阳黎明航天发动机集团、大连华锐重工集团等知名企业建立了良好的合作关系。

2012年11月份，湖南大学光伏实验室关于太阳辐射强度传感器的采购项目，我公司提供的型号：BL-ZFS型总辐射传感器中标此采购项目，并得到客户好评！一、概述总辐射表采用光电转换感应原理，与各种辐射记录仪或辐射电流表配合使用，能够精确地测量出太阳的总辐射，该系列辐射表的感应元件采用了绕线电镀式多接点热电堆，其表面涂有高吸收率黑色涂层，感应元件的热接点在感应面上，而冷接点位于仪器的机体内，以便直接取环境温度。当有光照时，冷热接点产生温差即产生电势差，进而将光信号转换为电信号输出，在线性误差范围内，输出信号与太阳辐射成正比。 为了减小环境温度对辐射仪器输出的影响，则在辐射表内部附加了温度补偿装置，通过调整热敏电阻的温度系数来实现对辐射表输出电势的自动补偿。辐射表被广泛地应用于太阳能利用、气象、农业、建筑、材料老化、大气污染及生态考察等部门。二、技术参数1、 灵 敏 度：7～14μV/Wm-22、 响应时间：≤30s3、 内 阻：约230Ω4、 稳 定 性：±2%（一年内灵敏度变化率）5、 余 弦：≤±5%（晴天太阳高度角为10o时对理想值的偏差）6、 温度特性：±2%（-20℃～+40℃）7、 重 量：1.5千克8、 测量范围：0～2000W/m29、 信号输出：0～20mV（配合DL-2标准电流变送器使用可输出4～20mA）10、测量精度：工作表＜5%；标准表＜2%11、测量光谱范围：280～3000nm