IRDK20 Infrared Optimized Optical Tube Assembly

The IRDK20 from PlaneWave Instruments is a finely engineered optical system designed specifically for precision in infrared wavelengths. It is an excellent tool for advanced astronomical research and remote sensing applications, providing outstanding performance in infrared imaging.

Key Features Overview

The IRDK20 boasts impressive specifications designed for infrared optimization:

• Gold-coated mirrors optimized for high reflectivity in infrared wavelengths (ultraviolet optimization available)
• 20-inch (508 mm) aperture
• 3454 mm focal length
• f/6.8 focal ratio
• 224 mm back focus from mounting surface
• 52 mm image circle
• Rock-solid fused silica mirrors with low thermal expansion
• Lightweight and rigid carbon fiber optical tube assembly
• About the IRDK20 (Infrared Optimized) Optical Tube Assembly

  IRDK20’s Key Features

  Large Aperture and Optimized Focal Ratio

  The IRDK20 features a substantial 508 mm aperture and an f/6.8 focal ratio, enhancing its ability to gather infrared light effectively. This setup is ideal for detailed infrared observations and long-exposure imaging, offering excellent light-gathering capabilities.

  Specialized Optical Design for Infrared

  The Dall-Kirkham optical design of the IRDK20 is optimized for infrared wavelengths. There are no refractive lenses, only reflective fused silica mirrors. The reflective coatings are a protected gold with better than 98% reflectivity from .65 microns (650nm) to 5 microns (5000nm), ideal for infrared astronomy or LIDAR applications. UV-optimized coatings can also be provided, so please contact our technical sales team to discuss UV optimization.

  Robust Mechanical Structure

  Constructed using carbon fiber, the optical tube of the IRDK20 provides durability and stability with minimal thermal expansion. This design ensures consistent performance across varying environmental conditions, making it suitable for intensive scientific applications.

  Advanced Thermal Management

  The IRDK20 includes cooling fans and a system prepared for Delta-T applications, promoting rapid thermal equilibrium. This setup is crucial for minimizing air turbulence within the tube, thus reducing potential image distortion and enhancing overall imaging quality.

  Integrated Dew Control

  Infrared observations can be prone to condensation, but the IRDK20 addresses this with advanced dew prevention technology. Heater pads, controlled via PlaneWave’s software, ensure the optical surfaces remain clear from dew, maintaining consistent and clear imaging performance.

  Application-Specific Benefits

  Infrared Astronomy

  The IRDK20 excels in infrared astronomy, where its large aperture and infrared-optimized optics allow for detailed observation of celestial objects in infrared light. This capability is crucial for studying astrophysical phenomena invisible to the naked eye or standard optical wavelengths.

  Advanced Research and LIDAR Applications

  With its specialized design and infrared optimization, the IRDK20 is a robust platform for advanced scientific research, including LIDAR applications.

  Aperture	20 in (508 mm)
  Focal Length	136 in (3454 mm)
  Focal Ratio	f/6.8
  Central Obstruction	39% of the Primary Mirror Diameter
  Back Focus from Mounting Surface	8.81 in (224 mm)
  Weight	140 lbs (63.5 kg)
  OTA Length	47 in (1194 mm)
  Upper Cage	Carbon Fiber Truss
  Lower Cage	Carbon Fiber Truss with Carbon Fiber Light Shroud

  Diameter	7.5 in (191 mm)
  Material	Fused silica (quartz)
  Shape	Spherical
  Coating	Protected Gold

  Optical Diameter	20 inch (508 mm)
  Outer Diameter	20.5 in (521 mm)
  Shape	Prolate Ellipsoid
  Material	Fused Silica (quartz)
  Coating	Protected Gold

  Included Items	Heating Elements for Dew Prevention - The heating pads on the primary and secondary mirror require the 600195 Delta-T controller sold separately
  	OTA Cover - To protect the primary mirror and inside of the optical tube
  	Flashdrive - Contains software and instructions for collimation and spacing the primary to secondary mirror
  	Wrench Set (5812A35) - Standard hex wrenches (European orders only)