| 摘要 |
<p>PROBLEM TO BE SOLVED: To make a measuring apparatus convenient to be carried by the driving of a battery and to simply measure a contamination degree by using a light emitting diode(LED) as a light source to compensate the defect from an aspect of characteristics possessed thereby. SOLUTION: The opening part of a measuring head 1 is pressed to the surface of a standard carpet to irradiate the same with near infrared rays from an LED 12. A photodiode 11 outputs voltage Va 100 in an aesthetic degree 100% from the reflected light thereof and the voltage is amplified by an amplifier to be stored in a memory 33. In the same way, a plurality of places of the carpet to be measured are irradiated and voltage VaX outputted from the photodiode 11 is outputted to be stored in the memory 33. The respective stored data are operated by an operator 30 to be displayed on a display 5 as an aesthetic degree. At this time, when voltage VaW prellminarily applied to a standard white plate 21 is amplified, a feedback resistor 22 is controlled to set output voltage at every head 1 so as to make the same constant and the temp. of the LED 12 is detected to operate the output voltage of the amplifier 21 to compensate temp. A ratio R of voltage Vag generated at every head 1 by irradiating a standard gray plate and voltage VaW is calculated and the data is multipled by the ratio to compensate irregularity.</p> |
