A Theory on Setting Zero-flow Level of Thermoelectric Flowmeter by Means of Compensation for Thermal Diffusion
スポンサーリンク
概要
- 論文の詳細を見る
For measurements of blood velocity with a thermoelectric blood flowmeter, various sources of errors, which result in the zero drift of the flow level. These include difficulty of correcting the measured results mainly attributable to the nonlinear relationships between the blood velocity and the measured output such as originated from thermal shift of the hot junction and/or of the heater current, some degradations of the sensor during use, and noise and thermal drift in the amplifier system. Since the majority of these errors resulted in the unstable drift of the zero velocity level during measurements, it is important to facilitate detection of the zero velocity level during measurements without stopping the blood movement around the sensor by mechanical compression, which sometimes can not be done successfully. In order to eliminate this zero level setting during experiments, a new technique is proposed in this paper, i.e., that of setting the isothermal atmosphere around the hot junction located in the outer guide sleeve as a heat sink. This new method of setting zero velocity level has been developed by pulling back temporarily the thermal sensor into the guide sleeve, where thermal diffusion is maintained constant by a specially designed thermal compensation layer placed inside the guide tube. While the sensor is kept within this compensation layer, the thermal diffusion around the sensor may be simulated as the zero velocity atmosphere. Theoretical analysis related to this new technique has been considered from the standpoint of the thermal diffusion theory, and the theoretically computed results indicated fairly good agreement with the results obtained by the in vitro experiments.
- 一般社団法人 日本生体医工学会の論文
一般社団法人 日本生体医工学会 | 論文
- Evaluating the Workload Reduction of Automatic Vital Data Transmission
- Mental Fatigue Measurement Based on the Changes in Flicker Perception Threshold using Consumer Mobile Devices
- A Theoretical Study on a Computational Algorithm for Human Posture Estimation Based on Motion Capture of a Small Number of Markers
- Latest microscopic technique. From the principle to application. Development of three-dimensional microscopic system for operation of mini-pig fertilized eggs.
- A Study of the Automation of Cytodiagnosis (The Second Report):Cytophotometry Using Photomicroscanner and a Trial of Data-processing