Hot-wire measurements with automatic compensation of ambient temperature changes

Supply Voltage Compensation of Hot Wire Flow Measurement Device

Supply voltage compensation is important to keep the accuracy for hot wire/hot film gas flow sensors. A compensation experiment device is established, the two steps curve fitting is presented to determine the functional relations among flow、sensor output and supply voltage, the coefficient of fitting polynomial is determined by Least Square method, thus eliminating the influence of supply volta...

Hot-wire polysilicon waveguides with low deposition temperature.

We fabricated and measured the optical loss of polysilicon waveguides deposited using hot-wire chemical vapor deposition at a temperature of 240°C. A polysilicon film 220 nm thick was deposited on top of a 2000 nm thick plasma-enhanced chemical vapor deposition silicon dioxide layer. The crystalline volume fraction of the polysilicon film was measured by Raman spectroscopy to be 91%. The optica...

The Hot - wire Anemometer for Turbulence Measurements part III

Hot-Wire Attenuation and Its Correction in Turbulence Measurements

A scheme is proposed for correcting the hot-wire attenuation in turbulence measurements in both frequency and time domains. The scheme is tested for simulated hot-wire signals under velocity impulse and sinusoidal perturbations of various frequencies. It is found that the frequency response of the hotwire system and the calculated central moments, after applying the correction, can be greatly i...

Modulation of Menopausal Hot Flashes by Ambient Temperature

-1. The effect of ambient temperature on frequency, intensity and duration of hot flashes was studied in six women with hot flashes who were exposed to cool (T a = 19°C) and warm (ira = 31°C) /'as for 8-h periods. Heart rate, skin resistance, core and skin temperatures, subjective hot flash intensity and duration were recorded. 2. In the cool T~ as compared with the warm Ta, hot flashes were si...