The purpose of this work is to realize a low-cost sensor for measuring the clay moisture, by metering the reflection at two different laser wavelengths, 1,300 and 1,500 nm. This kind of reflection measurement is well known: the standard implementation employs a lamp and a series of optical filters, selected sequentially by a mechanical handling system. In order to simplify the system, the proposed sensors employ two laser-diode sources and a single photodetector, without moving parts or optical filter. The measurement of different reflections is made working in time division multiplexing. Custom low-noise electronics allows rejecting ambient light disturbances and digital processing makes the system independent of the clay distance.
Moisture measurement system for brick kiln
NORGIA, MICHELE;PESATORI, ALESSANDRO
2014-01-01
Abstract
The purpose of this work is to realize a low-cost sensor for measuring the clay moisture, by metering the reflection at two different laser wavelengths, 1,300 and 1,500 nm. This kind of reflection measurement is well known: the standard implementation employs a lamp and a series of optical filters, selected sequentially by a mechanical handling system. In order to simplify the system, the proposed sensors employ two laser-diode sources and a single photodetector, without moving parts or optical filter. The measurement of different reflections is made working in time division multiplexing. Custom low-noise electronics allows rejecting ambient light disturbances and digital processing makes the system independent of the clay distance.| File | Dimensione | Formato | |
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Norgia1_AISEM2013_book.pdf
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