Stray-light testing station
Methods, systems, and apparatus, for a stray-light testing station. In one aspect, the stray-light testing station includes an illumination assembly including a spatially extended light source and one or more optical elements arranged to direct a beam of light from the spatially extended light source along an optical path to an optical receiver assembly including a lens receptacle configured to receive a lens module and position the lens module in the optical path downstream from the parabolic mirror so that the lens module focuses the beam of light from the spatially extended light source to an image plane, and a moveable frame supporting the optical receiver assembly including one or more adjustable alignment stages to position the optical receiver assembly relative to the illumination assembly such that the optical path of the illumination assembly is within a field of view of the optical receiver assembly.
1. An apparatus comprising:
an illumination assembly comprising a spatially extended light source and one or more optical elements arranged to direct a beam of light from the spatially extended light source along an optical path, the illumination assembly comprising a parabolic mirror arranged in the optical path, wherein a diameter of the beam of light at the parabolic mirror is larger than a lateral dimension of the parabolic mirror;
an optical receiver assembly comprising a sensor and a lens receptacle configured to receive a lens module and position the lens module in the optical path downstream from the parabolic mirror so that the lens module focuses the beam of light from the spatially extended light source reflected off the parabolic mirror to an image plane of the sensor; and
a moveable frame supporting the optical receiver assembly, the moveable frame comprising one or more adjustable alignment stages, wherein the adjustable alignment stages position the optical receiver assembly relative to the illumination assembly such that the optical path of the illumination assembly is within a field of view of the optical receiver assembly.
2. The apparatus of claim 1 , wherein parabolic mirror is an off-axis parabolic mirror.
3. The apparatus of claim 2 , wherein the off-axis parabolic mirror is off-axis by 30° degrees, 60° degrees, or 90° degrees.
4. The apparatus of claim 1 , where the beam of light from the spatially extended light source is apodized, forming a uniform beam of light across a diameter.
5. The apparatus of claim 1 , wherein the spatially extended light source is adjustable over a range of angles.
6. The apparatus of claim 5 , wherein the spatially extended light source has a 0.5° degree angular extent.
7. The apparatus of claim 1 , wherein the one or more optical elements further includes one or more neutral density filters.
8. The apparatus of claim 1 , wherein the beam of light from the illumination assembly is allowed to reach the optical receiver assembly.
9. The apparatus of claim 1 , further comprising a control unit in data communication with the illumination assembly and optical receiver assembly, and operable to perform the operations of performing a stray light test.
10. The apparatus of claim 1 , wherein the sensor is a CMOS camera.
11. The apparatus of claim 1 , wherein the lens receptacle comprises a compression fixture.
12. The apparatus of claim 1 , wherein the optical receiver assembly comprises an adjustable receptacle configured to receive a camera module and position the camera module in the optical path downstream from the parabolic mirror so that the beam of light from the illumination assembly is focused to an image plane at the camera module.
13. The apparatus of claim 1 , wherein the adjustable alignment stages can be adjusted in one or more dimensions to position the optical receiver assembly over a range of angles.