| 摘要 |
A transmitivity sensor having a light source and a detector on one side of a medium with a reflector on the other side of the medium so as to reflect the light from the light source back through the medium to the detector. For instance, the sensor may be used on a window of a sealed building or container without having connections to the source and detector break the integrity of the window seal relative to the building or the container. The magnitude of the light signal on the detector relative to that of the source is an indication of the transmitivity of the window. Electronics to effectively implement the sensor are connected to the source and detector. The electronics may contain, for example, a source driver, a detector amplifier, a band-pass filter, a logarithmic amplifier and various voltage sources. Other items may be a part of the electronics as desired.
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