RC reflective optical system mirror quality requirements and inspection methods

RC reflective optical system is a reflective optical system commonly used in telescopes and astronomical telescopes. The key component is a set of mirrors that bounce light back to focus it in focus. Therefore, the quality of the mirror directly affects the optical performance of the system. This paper introduces the requirements and inspection methods of mirror quality of RC reflective optical system.

First, mirror quality requirements

1. The surface should be flat and smooth, without obvious scratches, defects, defects, etc.

2. High reflectivity: For optical systems such as telescopes or astronomical telescopes, the reflectivity of higher requirements is as high as 99% or more;

3. No distortion: high-resolution telescope photo images need to reach 10 arc seconds, so the distortion of the mirror is better than 5 arc seconds.

4. Anti-stain and anti-oxidation: Due to factors such as humidity and high altitude, night dew and high-altitude oxidation can lead to mirror pollution or corrosion.

Second, mirror quality inspection methods

1. Appearance inspection: Observe whether the mirror surface is flat, no scratches, cracks, pores and other surface defects, check whether the mirror disk meets the requirements.

2. Reflectance check: The reflectance coefficient can be measured directly by the SG-II reflectance meter.

3. Dryness measurement: The water volatilized to the inverted mirror, you can use a thermometer to monitor the temperature difference over a period of time, can reflect whether the evaporation speed meets the standard.

4. Distortion check: Check the imaging quality of the telescope at 100 meters away, such as whether the dispersion, distortion, sharpness, etc., is uniform.

5. Grayscale check: Using a colorimeter built into a standard grayscale meter, this method can measure the uniformity and brightness of the mirror table, as well as the influence of surface reflectivity.

6. Electron microscope inspection: The use of electron microscope for inspection, through the high-resolution measurement of the microscope to the mirror's geometric structure meets the standard, and check whether the surface defect is too large.

7. Practical application testing: Because different applications require different optical-mechanical technologies, the next step is to test the optical system in the actual use environment, such as the imaging effect and resolution of the telescope.

In short, the mirror quality of RC reflective optical system is one of the most important factors affecting the performance of the system, and various inspection methods should be combined with practical application requirements for comprehensive evaluation to ensure the stability and reliability of the optical system.