Hair-care appliance with hair-moistness measurement by measuring

Details Hair-care appliance with hair-moistness measurement by measuring Hair-care appliance with hair-moistness measurement by measuring

1996-09-11

1999-01-12

Williams, Hezron

Measuring and testing

Moisture content or absorption characteristic of material

738658, 324694, 324696, 219222, 132212, G01N 2556

Patent

active

058573798

ABSTRACT:
A hair-care appliance measures the moistness of the hair by measuring the resistance (R.sub.x) of the hair between measurement electrodes (14A/14B). The hair resistance (R.sub.x) is included in a T network comprising a first resistor (20) driven by a voltage source (28) and a second resistor (24). The signal current (I.sub.s) through the second resistor is measured and converted into a measurement signal (MS) by a converter (30). As a result of the use of the T network a comparatively large resistance variation of the hair resistance (R.sub.x) is required for a given amplitude variation in the signal current (I.sub.s). This allows measurements over a wider resistance range while the resolution is maintained.

REFERENCES:
Oliver et al. "Electronic Measurements and Instrumentation", 1971, pp. 276-279.

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