Sensor window comprising a plurality of sets of layers to reflect one or more colors of light that match a surface adjacent to the sensor window
A sensor window may include a substrate and a set of layers disposed onto the substrate. The set of layers may include a first subset of layers of a first refractive index and a second set of layers of a second refractive index different from the first refractive index. The set of layers may be associated with a threshold transmissivity in a sensing spectral range. The set of layers may be configured to a particular color in a visible spectral range and may be associated with a threshold opacity in the visible spectral range.
1. A sensor window comprising:
a first set of layers; and
a second set of layers,
the first set of layers and the second set of layers being configured to:
pass near-infrared light; and
reflect one or more colors that match a surface adjacent to the sensor window.
2. The sensor window of claim 1 , further comprising:
a substrate matched to an air environment.
3. The sensor window of claim 1 , wherein the sensor window is hidden from view based on the one or more colors being reflected.
4. The sensor window of claim 1 , wherein the sensor window enables a sensor to transmit the near-infrared light and receive reflected near-infrared signal without the near-infrared light being blocked by the sensor window.
5. The sensor window of claim 1 , wherein the first set of layers comprise a high refractive index material that has a refractive index of greater than approximately 3.0.
6. The sensor window of claim 1 , wherein the second set of layers comprise a low refractive index material that has a refractive index of less than approximately 2.7.
7. The sensor window of claim 1 ,
wherein the first set of layers comprise a high refractive index material that has a first refractive index,
wherein the second set of layers comprise a low refractive index material that has a second refractive index, and
wherein a difference between the first refractive index and the second refractive index is greater than approximately 1.5.
8. The sensor window of claim 1 ,
wherein the first set of layers are different from the second set of layers, and
wherein the first set of layers alternate with the second set of layers.
9. A system comprising:
a sensor; and
a sensor window configured to:
pass near-infrared light; and
reflect one or more colors that match a surface adjacent to the sensor window.
10. The system of claim 9 , wherein the sensor is configured to perform a measurement of the near-infrared light.
11. The system of claim 9 , wherein the near-infrared light is reflected toward the sensor.
12. The system of claim 9 , wherein the sensor window comprises:
high refractive index material layers that have a first refractive index, and
low refractive index material layers that have a second refractive index,
wherein a difference between the first refractive index and the second refractive index is greater than approximately 1.5.
13. The system of claim 9 ,
wherein the one or more colors are one or more colors of a first light, of a first portion of an input optical signal, that is reflected in a manner that causes the sensor window to appear as a particular color of the surface, and
wherein the first portion of the input optical signal further comprises second light that is absorbed.
14. The system of claim 13 , wherein the near-infrared light is a second portion of the input optical signal.
15. The system of claim 9 , wherein the sensor window is associated with multiple component filters that are associated with multiple spectral ranges.
16. The system of claim 9 , wherein, based on a varying thickness of the sensor window, different portions of the sensor window pass different wavelengths of light to different sensor elements of the sensor.
17. The system of claim 9 , wherein the sensor is configured to provide an output electrical signal based on the near-infrared light.
18. A sensor window comprising:
a substrate;
a first side, disposed on the substrate, comprising:
a first set of layers, and
a second set of layers; and
a second side, disposed on the substrate, comprising:
a third set of layers, and
a fourth set of layers,
the substrate, the first side, and the second side being configured to:
pass near-infrared light; and
reflect one or more colors that match a surface adjacent to the sensor window.
19. The sensor window of claim 18 ,
wherein the first set of layers comprise a high refractive index material that has a first refractive index,
wherein the second set of layers comprise a low refractive index material that has a second refractive index, and
wherein the first refractive index is higher than the second refractive index.
20. The sensor window of claim 19 ,
wherein the third set of layers comprise the high refractive index material, and
wherein the second set of layers comprise the low refractive index material.