Sensing and Control
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Sensing and Control |
Abstract |
The U.S. Department of Energy standards for laundry and dishwashers are expected
to be announced this year for appliances built after January 1, 1999. To
meet these high efficiency targets, the OEM designers are searching for practical
solutions to improve the efficiency of these appliances. The availability
of turbidity sensing on appliances will provide design engineers with a way
to determine how soiled a particular load of clothes or dishes may be so
engineers can then create a control system that adapts the operation of the
machine to save water, time and energy, while providing superior cleaning
performance. Because of this capability, the turbidity sensor is emerging
as a key building block developing the next generation of energy efficient
"smart" appliances.
This paper is intended to provide the reader within some insight to the origin of turbidity sensing, improvements to the technology since its introduction, and its relative importance to the appliance industry today. Different turbidity sensor configurations are discussed, along with practical design issues the engineer will need to address.
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