Discussion Overview
The discussion revolves around calculating the irradiance from an infrared LED after it passes through a diffuser. Participants explore methods for determining the irradiance at a certain distance from the diffuser, including considerations of the diffuser's transmission and output angle.
Discussion Character
- Exploratory
- Technical explanation
- Mathematical reasoning
- Debate/contested
Main Points Raised
- One participant suggests calculating the irradiance at the diffuser and then applying the transmission factor of the diffuser, but expresses uncertainty about how to account for the radiation output angle.
- Another participant emphasizes the need to characterize the diffuser's output and convolve it with the LED's emission pattern, mentioning that ray tracing programs could assist but require knowledge of the patterns.
- A participant mentions having datasheets for both the LED and the diffuser, indicating that the necessary information should be available, and inquires about free ray tracing software options.
- One participant argues that ray tracing may not be suitable due to the lack of a well-characterized transfer matrix for diffusers, suggesting convolution of the LED output with the diffuser profile as a simpler approach.
- Another participant recommends ImageJ as a free image processing software that could be used for convolutions and FFT of images, noting its utility in handling emission patterns.
- A participant with a mechanical engineering background seeks clarification on using ImageJ, specifically regarding the need for grayscale images of the emission patterns for convolution.
- Another participant confirms the use of ImageJ and mentions its user-friendly literature, highlighting a built-in function for applying arbitrary filters to images.
Areas of Agreement / Disagreement
Participants express differing views on the best approach to calculate irradiance, with some advocating for ray tracing and others suggesting convolution methods. There is no consensus on the most effective method, and uncertainty remains regarding the characterization of the diffuser.
Contextual Notes
Participants note limitations related to the characterization of the diffuser and the dependence on specific definitions and data from the LED and diffuser datasheets. The discussion also reflects varying levels of familiarity with the necessary software tools and techniques.
Who May Find This Useful
Individuals interested in photometric and radiometric principles, particularly those working with infrared light sources and diffusers, as well as those seeking software solutions for optical simulations.
