Cleaning efficacy real time indicator

Details Cleaning efficacy real time indicator Cleaning efficacy real time indicator

1997-12-18

1999-07-13

Kim, Robert H.

Optics: measuring and testing

For light transmission or absorption

68 1202, 134113, 134 252, 134 57D, 134 58D, G01N 2100, D06F 3300, B08B 300, B08B 920

Patent

active

059234326

ABSTRACT:
A cleaning efficacy indicator system (20) includes a light source (50) and a light receiver (56). A light-transmitting optical indicator element (30) receives light from the source (50) and transmits the light to the receiver (56). The receiver (56) provides at an electrical output signal (82) which varies in accordance with light received from the light source (50). The light-transmitting optical indicator element (30) is purposefully soiled on its outer surface (48) with a soiling agent to inhibit or alter its light transmitting abilities. However, upon effective washing, the indicator element (30) is able to transmit an increased light intensity. The indicator element (30) is washed with a load of soiled articles. Either during washing operations or subsequently, the light transmission through the indicator element (30) is monitored using the light output signal (82) of the light receiver (56). A select change in light transmission is indicative of effective washing operations.

REFERENCES:
patent: 4559813 (1985-12-01), Brekelmans
patent: 5219345 (1993-06-01), Potter
patent: 5233203 (1993-08-01), Haga
patent: 5245403 (1993-09-01), Kato et al.
patent: 5265446 (1993-11-01), Kuroda et al.
patent: 5411042 (1995-05-01), Suzuki et al.
patent: 5479252 (1995-12-01), Worster et al.
patent: 5481109 (1996-01-01), Ninomiya et al.

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