The Experts below are selected from a list of 180 Experts worldwide ranked by ideXlab platform

Tor G Malmstrom - One of the best experts on this subject based on the ideXlab platform.

  • a simple method for low speed Hot Wire Anemometer calibration
    Measurement Science and Technology, 1998
    Co-Authors: Tor G Malmstrom
    Abstract:

    A simple laminar pipe-flow method for Hot-Wire Anemometer calibration in the low-velocity range is described. The stable flow was generated by draining water from an air-tight container at a constant rate. The influence of humidity variations between calibration and application was analysed. Calibration results were compared with results from another available device. One measurement of the laminar pipe-flow velocity profile using the calibration results was also performed. The present method was demonstrated to be a simple, but accurate, means for low-speed Hot-Wire Anemometer calibration.

Carol A Roberts - One of the best experts on this subject based on the ideXlab platform.

  • measuring flow velocity at elevated temperature with a Hot Wire Anemometer calibrated in cold flow
    International Journal of Heat and Mass Transfer, 2002
    Co-Authors: Stephen F Benjamin, Carol A Roberts
    Abstract:

    Abstract Correction factors enable a Hot Wire Anemometer calibrated at room temperature to be utilised at elevated temperature. This short paper reviews the equations on which those correction factors are based. The standard methods of correction, which work only over moderate temperature changes of a few degrees in the ambient, have been investigated over a greater temperature range. Modified correction factors are effective over a velocity range of 0–14 m/s and temperature range of 300–500 K. The modified method of correction has been developed during research into the warm up of automotive catalysts and this has prescribed the range of velocity and temperature considered.

Stephen F Benjamin - One of the best experts on this subject based on the ideXlab platform.

  • measuring flow velocity at elevated temperature with a Hot Wire Anemometer calibrated in cold flow
    International Journal of Heat and Mass Transfer, 2002
    Co-Authors: Stephen F Benjamin, Carol A Roberts
    Abstract:

    Abstract Correction factors enable a Hot Wire Anemometer calibrated at room temperature to be utilised at elevated temperature. This short paper reviews the equations on which those correction factors are based. The standard methods of correction, which work only over moderate temperature changes of a few degrees in the ambient, have been investigated over a greater temperature range. Modified correction factors are effective over a velocity range of 0–14 m/s and temperature range of 300–500 K. The modified method of correction has been developed during research into the warm up of automotive catalysts and this has prescribed the range of velocity and temperature considered.

Zhemin Chen - One of the best experts on this subject based on the ideXlab platform.

  • Hot-Wire Anemometer based on silver-coated fiber Bragg grating assisted by no-core fiber
    IEEE Photonics Technology Letters, 2013
    Co-Authors: Xinhuai Wang, Jia Cheng, Kai Ni, Yan Zhou, Xinyong Dong, Zhemin Chen
    Abstract:

    A novel Hot-Wire Anemometer based on a silver-coated optical fiber Bragg grating (FBG) is proposed and experimentally demonstrated with the assistance of a short length of no-core fiber (NCF). The silver coating deposited on the surface of the FBG absorbs light of a pump laser, which is coupled into the fiber cladding by the NCF, to generate the heat, whereas air flow cools down the FBG by taking the heat away. A dynamic thermal equilibrium with a temperature codetermined by the pump laser power and airflow velocity can be reached. Bragg wavelength of the FBG changes with temperature thus is used to measure airflow velocity. Experimental results reveal that the highest resolution of ~ 0.0017 m/s is achieved and the measurement range covers 0-13.7 m/s.

Pawel Ligeza - One of the best experts on this subject based on the ideXlab platform.

  • an investigation of a constant bandwidth Hot Wire Anemometer
    Flow Measurement and Instrumentation, 2009
    Co-Authors: Pawel Ligeza
    Abstract:

    Abstract A model for a constant-bandwidth Hot-Wire Anemometer and experimental testing of such a Anemometer prototype are presented in this article. During the testing, an approximately constant Anemometer transmission bandwidth, and good conformity between the model and the real measurement system were achieved. The system developed and outlined herein allows for minimization of the dynamic errors that arise during the measurement of rapidly changing flow velocity fluctuations, in which the mean velocity changes significantly. However, the electronic circuitry needs to be extended, and some additional parameters are required for the Anemometer adjustment process. It appears that the results obtained are sufficient for a positive evaluation of the capabilities of the developed measurement system in a wide range of metrological applications.

  • optimization of single sensor two state Hot Wire Anemometer transmission bandwidth
    Sensors, 2008
    Co-Authors: Pawel Ligeza
    Abstract:

    Hot-Wire anemometric measurements of non-isothermal flows require the use of thermal compensation or correction circuitry. One possible solution is a two-state Hot-Wire Anemometer that uses the cyclically changing heating level of a single sensor. The area in which flow velocity and fluid temperature can be measured is limited by the dimensions of the sensor's active element. The system is designed to measure flows characterized by high velocity and temperature gradients, although its transmission bandwidth is very limited. In this study, we propose a method to optimize the two-state Hot-Wire Anemometer transmission bandwidth. The method is based on the use of a specialized constant-temperature system together with variable dynamic parameters. It is also based on a suitable measurement cycle paradigm. Analysis of the method was undertaken using model testing. Our results reveal a possible significant broadening of the two-state Hot-Wire Anemometer's transmission bandwidth.

  • model tests of dynamic parameters of double Hot Wire Anemometer method
    Optoelectronic and Electronic Sensors V, 2003
    Co-Authors: Pawel Ligeza
    Abstract:

    Hot-Wire measurements in non-isothermal flows require temperature compensation or correction. One of the solutions is the system of two Hot-Wire Anemometers which enable to measure velocity and temperature in non-isothermal gas flows. The output signals come from two Hot-Wire Anemometers operating at different overheat ratio. As the two sensors operate in a CTA mode, we get a wide range of frequency bandwidth for velocity and temperature measurements. This paper presents the results of modeling and optimization of a double Hot-Wire Anemometer system providing temperature correction of anemometric signal.