Скачать или смотреть Remote Pressure Tuning a Lunt Solar Telescope

This video documents some experiments in remote pressure tuning of my Lunt LS80THa double-stack solar telescope. Remote tuning allows the operator to sit directly in front of the computer monitor while making the tuning adjustments instead of having to turn the knobs on the telescope which introduces shaking. The video shows the replacement of the original pressure plunger with a 3D-printed pressure plunger allowing the introduction of pressure from an external tube. For simplicity and reduced cost, both etalons are tuned to the same pressure. Two different means of applying pressure to tune the etalons are shown. First, a manual pressure pump (Ralston Instruments DP0V) is used to tune the etalons. Second, a miniature pressure regulator (Dwyer MPR1-1, 0-15 PSI) is used to provide regulated pressure from a small air compressor for long-duration solar imaging in the presence of slow air leakage. It was found that a relatively coarse tuning to +/- 0.5 PSI was sufficient for getting on band. Also, tuning both etalons to the same pressure worked pretty well and provided a simpler, cheaper solution.