Determination and optimization of frequency response of constant temperature hot-wire anemometers in supersonic flows
Abstract
In order to achieve turbulence measurements in supersonic flows the frequency response of CTA is tested and improved. A fast and convenient technique to determine electrically the frequency response is proposed; the response is also tested by direct heating of the wire by means of a laser beam. The two techniques are in good agreement. Under certain experimental conditions (M=2, Reφ=400) it is possible to use CTA with a satisfactory frequency response up to 250 kHz and overheat ratios down to 0.07. In these severe operating conditions, the square-wave test technique seems to be not sufficient to ensure optimum settings and it is necessary to use symmetrical bridges with fine adjustment of offset voltage.
- Publication:
-
Review of Scientific Instruments
- Pub Date:
- February 1980
- DOI:
- 10.1063/1.1136180
- Bibcode:
- 1980RScI...51..234B
- Keywords:
-
- Frequency Response;
- Hot-Wire Anemometers;
- Optimization;
- Supersonic Flow;
- Turbulence Meters;
- Bandpass Filters;
- Laser Heating;
- Signal To Noise Ratios;
- Supersonic Wind Tunnels;
- Turbulent Flow;
- Instrumentation and Photography;
- 06.30.Gv;
- 07.90.+c;
- Velocity acceleration and rotation;
- Other topics in instruments apparatus and components common to several branches of physics and astronomy