A unique project designed and manufactured by DFM Engineering was a 40 cm telescope for a balloon borne experiment.
This telescope used Invar spacers to minimize focus shift with temperature and had special mirror supports to allow the telescope to look below the horizon.
DFM has also designed and manufactured four specialized telescopes and instruments for measuring astronomical seeing.
These telescopes are customized versions of the standard DFM CCT-16 but have special optics, invar spacers and a full aperture optical window with dew shield.
The hermetically sealed optics breathes through a canister of desiccant.
An example of a customized version of the standard CCT line is the satellite-tracking telescope.
It requires a servo drive system for very precise positioning and velocity control since the target is almost always moving.
Features such as dynamic response, symmetrical fork mount and high resonant frequency prove significant.
Another example is the Big Bear Solar Telescope which presents unique problems of scattered light and thermal control.
A 1.6M solar telescope was designed and manufactured by DFM Engineering to study solar surface granulation.
The clear aperture, off-axis telescope design included particular attention to the full light path, from its entrance through the adaptive optics to the final field of view. Calibration
and heat uniformity throughout the light path were of primary concern.
mirror is 1.7 m off-axis, which leaves the secondary mirror well-away
from the path of the incoming light.
After the secondary, the light
comes to the first set of polarization optics, which contains calibration optics.
The tertiary mirror then sends the light down the
declination axis of the solar telescope.
The off axis, unobstructed optical system has much reduced diffraction and much less scattered light compared to a
concentric Cassegrain configuration.
This combined with adaptive optics and careful temperature control results in
very high quality solar images.
The engineering of this high quality optical system enabled observation of solar mini-granules form a multi-fractal structure in real time.
This discovery of remarkable bursting, jagged behavior mimicked other systems in nature, such as coastlines, glaciers, earthquakes, etc. providing scientists with extraordinary data.
For more information about the telescope: The New Solar Telescope in Big Bear: Polarimetry I
Please contact us with your custom design needs.
Telescope Optics Standard Features
Engineering Article: Telescope Optics Study
DIMM (Differential Image Motion Monitor)