H - Electricity – 05 – B
Patent
H - Electricity
05
B
324/3
H05B 6/00 (2006.01) G01K 15/00 (2006.01) G12B 13/00 (2006.01) H05B 6/80 (2006.01)
Patent
CA 1056455
A B S T R A C T A method and apparatus for inspecting the location and orientation of a sensor assembly in a tray-sensor arrangement adapted to be placed in a microwave oven. The sensor assembly which includes a ferromagnetic element that absorbs energy when placed in the oven and changes its characteristics when a pre- determined amount of energy has been absorbed, is tested in the completely assembled tray by accurately position- ing the tray in predetermined relation to an oscillating circuit whose operating frequency is responsive to the presence of the ferromagnetic sensing element. The out- put frequency of the oscillating circuit indicates whether or not the sensor assembly has been properly assembled and positioned on the tray. The oscillator circuit includes a frequency determining element which produces a dis- tinctly different frequency when the sensor is not properly positioned in the assembly or is omitted form the assembly. The output frequency of the oscillating circuit is supplied to an electronic meter such as a counter or frequency meter to display the operating frequency, or acceptable range of frequencies, to pro- vide an indication of the acceptability of the sensor assembly and tray.
265056
Kuntz William H.
Moore Donald G.
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