| 摘要 |
A switching apparatus and method are provided for employment in a sealed enclosure. The switching apparatus includes a transparent window, a light-emitting device, and a light-responsive device. The transparent window is a part of an enclosure that is sealed to preclude infiltration of an ambient environment. The transparent window is configured for placement of an object. The light-emitting device is within the enclosure and is disposed closely adjacent to a first point of the transparent window. The light-emitting device emits light through the transparent window into the ambient environment. The light-responsive device is also within the enclosure and is disposed closely adjacent to a second point of the transparent window. The light-responsive device is configured to detect the light. The transparent window allows for transmission of the light. Placement of the object interrupts detection of the light by the light-responsive device.
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