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List of contents for this article:

• 1、How to calculate the central obstruction ratio of a Cassegrain system
• 2、What is the design method for Cassegrain antenna sidelobe suppression
• 3、What is the Green System?

How to calculate the central obstruction ratio of a Cassegrain system

1. According to the design requirements and the structural characteristics of the Cassegrain telescope, we can directly obtain the following parameters: the main mirror is a parabolic mirror, and the cone coefficient is-1.

2. X half length is 25mm, Y half length is 35mm). According to the actual occlusion situation, modify the occlusion of the first virtual surface to be circular with a radius of 25 mm. The final results improved, but differences in the dot plots still remained, indicating that the design was complete. The Newton telescope has a simple structure, and off-axis astigmatism and coma cannot be reduced by adjusting the reflector. Flat mirrors do not contribute aberrations. The design is completed, and the system can be improved later by adding a correcting mirror group, namely the Cassegrain telescope.

3. Dividing f is equal to (n minus 1) times (1 divided by R1 minus 1 divided by R2 plus (n minus 1) times d divided by (n multiplied by R1 multiplied by R2). The formula for calculating Cassegrain's focal length is 1 divided by f equals (n minus 1) times (1 divided by R1 minus 1 divided by R2 plus (n minus 1) times d divided by (n multiplied by R1 multiplied by R2).

4. Direct incidence In systems such as Cassegrain, direct incidence occurs when the central obstruction is too large and/or the telescope barrel is too short. Light outside the field of view can enter the telescope, pass directly through the secondary mirror, pass through the opening in the primary mirror, and hit the focal plane directly in the form of stray light. If sunlight can enter directly, then this stray light is very harmful and a disaster for the system.

What is the design method for Cassegrain antenna sidelobe suppression

It can not only monitor the operation of the entire system, but also realize automated management. A terminal station (or hub station) can generally manage dozens or even hundreds of relay stations, thereby improving work efficiency and reducing maintenance costs.④ Development of antennas and feeders.

What is the Green System?

1. Green's system refers to one of the optical systems, also called Cassegrain's system. It is the most commonly used optical system for astronomical telescopes. It is characterized by a long focal length and a large negative scale. In addition, a larger receiver can be placed without blocking light. There are generally three designs for generalized Cassegrain systems.

2. Green's fresh air system is a fresh air system with superior performance and trustworthy. The following is a specific evaluation of Green's fresh air system: Outstanding purification effect: Green's fresh air system has a number of invention patents for removing gaseous pollutants, and the filter membranes used are independently produced based on Green's invention patents, ensuring its filtration effect. The air at the system outlet is strictly filtered to ensure the freshness of indoor air no matter how serious the outdoor pollution is.

3. Air-water: Between 1 and 2, that is, a full air system is used for large spaces and a full water system is used for small rooms. It has high flexibility and is the most used central air-conditioning system currently. For example, chiller plus fan coil systems are very common.

4. The policy level provides direction and guarantee; legal rules ensure the implementation and enforcement of rules; the organizational structure ensures the effective integration and coordination of resources and jointly builds a solid foundation for promoting change. The Green Model closely connects theory and practice. It realizes the sustainable development of education and environment by diagnosing and evaluating first, and then formulating and implementing corresponding policies and action strategies. It is a systematic and scientific thinking framework.