beijing optics

Methods for measuring a lens focal length

Methods for measuring a lens focal length

Methods for measuring a lens focal length Introduction The focal length is one of the most important parameter of a lens. Sometimes the focal length is slightly different from the datasheet value given by the manufacturer, having an impact on the predicted optical system performances. Many methods have been elaborated to measure with more or […]

Analyzing optical systems with MTF testing.

Tutorial Modulation Transfer Function Testing of Optomechanical Systems

Modulation Transfer Function Testing of Optomechanical Systems Abstract Modulation Transfer Function (MTF) testing is a fairly universal test of optomechanical system performance. All optomechanical systems are tested to verify their resolution performance. For many systems, this testing is the best way to quantify that the system is performing as it is required to. MTF testing […]

Measuring focal length of optical element.

Methods of measuring the focal length of the optical element

Methods of measuring the focal length of the optical element Introduction Focal length of optical elements is an essential parameter to optical engineers. In many applications, we need to get this parameter first then continue the following work. However, this parameter is not always known in advance or given in wrong value. In this situation, […]

Choosing image quality metrics for better results.

Image Quality Criteria –Which Metric Should I Use?

Image Quality Criteria –Which Metric Should I Use? Introduction Image quality criteria define the expected imaging performance of an optical system.  It may also be described as the set of requirements that characterizes how well the imaging system works.  It is imperative to have image quality criteria when designing an optical imaging system, this is […]

Methods for measuring a lens focal length

Methods for measuring a lens focal length

What is an Integrated Detector Assembly? Why are they used? Integrated Detector Assemblies are used to cool optical detectors In comparison with uncooled detectors, Cooled detectors have higher quantum efficiencies, operate at much faster speed of detection (frame rates) and are significantly more sensitive The amount of cooling necessary for operation is based upon the […]

Assessing image sharpness with MTF.

How to Measure MTF

How to Measure MTF Introduction With the growing role played by optical devices in measurement, communication, and photonics, there is a clear need for characterizing optical components. A basic and useful parameter, especially for imaging systems, is the Modulation Transfer Function, or MTF. Over the past few decades technological advances, including the laser interferometer, high-speed […]