Tuokun Optoelectronics Tech Wiki
A systematic knowledge base on optical instruments — collimator working principles and selection, blackbody emissivity and calibration, optical lens grinding and polishing — with engineering cases and parameter comparisons to help engineers choose the right optical devices.
Published Articles
How a Collimator Works and Its Types: On-Axis, Off-Axis, Cassegrain, and Ritchey-Chrétien Explained
The core of collimator principle in one line: turn a focal point source into a parallel beam to simulate infinity. We break down four structural types and key selection parameters.
How to Select a Collimator by Focal Length and Aperture: An Engineer's Practical Guide
Focal length, aperture and surface figure decide whether a collimator fits your test object. Scenario-based checklists and pitfalls for production, metrology and space calibration.
What Is Blackbody Radiator Emissivity? 5 Factors Affecting Calibration Accuracy
Emissivity measures how close a blackbody is to an ideal source. We break down the 5 engineering factors that decide real calibration uncertainty, plus calibration method.
Cavity vs Surface Blackbody: How to Choose for IR Thermal Imager Calibration
Cavity wins on emissivity, surface wins on aperture and uniformity. A comparison table and decision tree for IR imager and FPA calibration.
Off-Axis Collimator Applications in Aerospace / Military Optical Calibration: Case Studies
Why off-axis collimators with no central obstruction are standard for satellite-camera pre-launch calibration and IR seeker testing, with declassified cases.
Optical Lens Grinding and Polishing Process: From Rough Grinding to Nanometer Surface
From cutting and rough grinding to small-tool figuring at λ/10 figure and nanometer roughness — process steps, difficulties and equipment approach.
Condensation Problems of Cryogenic Blackbodies and Air-Curtain Cavity Design
Why cryogenic blackbodies condense and how dry-air / nitrogen air curtains isolate humid air, with a comparison of other anti-condensation schemes.