Abstract:
A filter disk rotator has been designed and developed in the electronics laboratory of Uttar Pradesh State Observatory (UPSO) for photometric observations. A stepper motor is used to rotate the filter disk in the forward as well as in the reverse directions. A start signal is required to drive the stepper motor to rotate the filter disk. As the filter comes in front of the diaphragm, its position is sensed by the photosensors and displayed on the observer panel and simultaneously a stop signal is generated to stop the motor. The observer can select the required filter at any time and may control the disk rotator remotely
