Optical transmission tester
An apparatus, system, and method for a see-through optical verification tester are described herein. In some aspects, a heating element such as a Peltier or Thermoelectric Cooler “TEC” may be used to control a temperature of an optical element. In examples, the see-through optical transmission tester includes a see-through void and may control temperature, humidity, and pressure of an environmental enclosure to facilitate optical see-through and reflective tests.
1. A system, comprising:
a light source to emit illumination light;
a light sensor; and
an environmental enclosure disposed between the light source and the light sensor and configured to control humidity and atmospheric pressure to simulate an environmental condition within the environmental enclosure, wherein the environmental enclosure includes a heating element located entirely inside the environmental enclosure, the heating element to pass a portion of the illumination light to the light sensor and to provide heat to an optical element to assist in testing an optical transmission or reflectivity of the optical element under the environmental condition, wherein the illumination light propagates from the light source through the heating element via a see-through void in the heating element, prior to becoming incident on the light sensor.
2. The system of claim 1 , wherein an entrance path window and a detection window are disposed on opposite sides of the environmental enclosure.
3. The system of claim 1 , wherein the heating element includes a Peltier to control a temperature of the optical element.
4. The system of claim 1 , wherein the light sensor is spaced from the optical element by an eye-relief distance that is between 8 millimeters (mm) and 50 mm.
5. The system of claim 1 , wherein the optical element is a near-eye optical element.
6. The system of claim 5 , wherein the near-eye optical element includes a waveguide configured to present display light including a virtual image to an eyebox region.
7. The system of claim 1 , wherein the light source includes at least one of an integrating sphere, a liquid crystal display (LCD) pixel array, or an organic light emitting diode (OLED) pixel array.
8. The system of claim 1 , wherein the light sensor includes a camera.
9. The system of claim 1 , further comprising:
optical measurement processing logic; and
a mechanical stage configured to hold the optical element and configured to move the optical element with respect to the see-through void in the heating element, wherein the optical measurement processing logic is configured to:
drive the mechanical stage to position the optical element in different lateral positions with respect to the heating element along an X-Y plane relative to the see-through void; and
initiate an optical measurement with the light sensor as the optical element stops at the different lateral positions.
10. The system of claim 9 , further comprising:
a temperature control system configured to receive temperature commands from the optical measurement processing logic, wherein the temperature control system is configured to adjust the heating element in response to receiving the temperature commands from the optical measurement processing logic.
11. The system of claim 9 , further comprising:
a humidity/pressure control system configured to receive humidity commands and pressure commands from the optical measurement processing logic, wherein the humidity/pressure control system is configured to adjust the humidity or pressure of the environmental enclosure in response to receiving the humidity commands or pressure commands, respectively.
12. The system of claim 11 , further comprising:
gas exchange tubes coupled between the humidity/pressure control system and the environmental enclosure, wherein the environmental enclosure is configured to receive humidity and atmospheric pressure inputs from the humidity/pressure control system via the gas exchange tubes.
13. The system of claim 9 , wherein the optical measurement processing logic is configured to drive the light source to change a color of the illumination light emitted by the light source.
14. The system of claim 1 , wherein the environmental enclosure is vacuum sealed.
15. An environmental enclosure comprising:
a humidity/pressure input port, wherein the environmental enclosure is configured to receive humidity or pressure inputs from the humidity/pressure input port for changing humidity or atmospheric pressure within the environmental enclosure;
a heating element including a see-through void that runs through the heating element;
a mechanical stage configured to hold an optical element to receive heat from the heating element and configured to move the optical element with respect to the see-through void of the heating element;
an entrance path window; and
a detection window disposed on an opposite side of the environmental enclosure from the entrance path window, wherein the entrance path window, the detection window, and the see-through void are aligned to pass illumination light from a light source, through the entrance path window, the see-through void, and the detection window to a light sensor, in that order.
16. The environmental enclosure of claim 15 , wherein the illumination light is provided by a light source that includes at least one of an integrating sphere, a liquid crystal display (LCD) pixel array, or an organic light emitting diode (OLED) pixel array.
17. The environmental enclosure of claim 15 , wherein the heating element includes a Peltier.
18. The environmental enclosure of claim 17 , wherein the light sensor is external to the environmental enclosure.
19. The environmental enclosure of claim 15 , wherein the mechanical stage is configured to move the optical element along an X-Y plane relative to the see-through void.