Patent ID: 11921203
Assignee: THE BOEING COMPANY
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G  H

Claim 10:
11. A method for detecting presence of an object, the method comprising:
emitting signals having a predefined wavelength and being directed toward a reflective surface;
in an absence of the object being disposed between a source of the signals and the reflective surface, at least partially attenuating the signals having the predefined wavelength with a filter that is associated with the reflective panel and positioned such that the signals that are emitted are also directed toward the filter, wherein at least partially attenuating the signals comprises allowing visible light to pass through the filter with less attenuation than that experienced by the signals having the predefined wavelength;
detecting a reflection of the signals having the predefined wavelength in response to the presence of the object between the source of the signals and the reflective surface; and
controlling operation of a system in response to detection of the reflection of the signals having the predefined wavelength.