Sap Flow Measurement Using a Digital Heat-Pulse Sensor

Evaluation of the heat pulse velocity method for measuring sap flow in Pinus patula

Information on the water use of Pinus patula plantations is required to predict the impact of forest plantations on water resources in South Africa. The heat pulse velocity (HPV) method is a promising technique for measuring water use by trees, and has been shown to measure sap flows accurately in a variety of hardwood trees. This method has not been sufficiently verified for pine trees where t...

Calibra Ting the Compensa Tion Heat -pulse Technique for Measuring Sap Flow in Olive

The compensation heat-pulse method, a technique for measuring sap f10w in plants, was caJibrated for the olive tree. Two calibration experiments were carried out, the excision and the perfusion experiments. A device was designed in our laboratory for the perfusion experiment, which allowed us to calibrate the technique for a range of 0.5 L h O ' to 14 L h" '. The correction factors given by Gre...

Pulse pressure velocity measurement - a wearable sensor

Pulse pressure velocity measurements (PPV) may be a source of useful information on artery state. A 2007 guideline of the European Society of Hypertension recommends assessing arterial stiffness in patients with arterial hypertension, by measuring the PPV. Mechanical changes in the cardiovascular tree involved in the blood ejection have been measured at the thorax level and on the wrist using i...

On the heat impulse method for deducing sap flow

Particles Mass Flow Rate and Concentration Measurement Using Electrostatic Sensor

In many industries where flow parameters measurement is essential to control manufacturing process, the use of a reliable, cost effective and high accuracy instrument is an important issue. Appropriate measurement method and design leads to improvement of pneumatic conveyors operation and process efficiency. This paper present an instrumentation design based on passive charge detection using a ...