Infrared Radiometer Calibrator
A Computer Engineering Senior Project
The Infrared Radiometer calibration system currently in place relies on old outdated hardware that is no longer relevant. It is overly complex with around 120 separate components. The environmental chamber used to heat and cool the process is cumbersome and slow and only has the ability to hit one set point at a given time. Temperature controls must be placed inside the environmental chamber, reducing the efficiency of these controls and the chamber itself as they compete against each other to hit their set points. A single calibration job requires 15 hours to complete and must be restarted at the beginning if something were to go wrong.
The redesigned Infrared Radiometer and calibration system makes use of 3d printed parts to channel cooled and heated liquid to the most efficient areas. The new system increases accuracy, and ease of use while decreasing complexity and total calibration time. A software interface allows for easy configuration of the calibration process and custom jobs. The decision was made for a smaller sensor housing to accommodate small jobs such as RMA’s and which multiple can be chained together for large calibration batches.
A new communications board was designed and printed to communicate with the sensors and to monitor thermistors during the calibration process. This allowed us to eliminate the dependence on the archaic CR5000 data logger. The communications board combined with custom software also allowed us to intermix sensor types in a single run; analog and digital Infrared Radiometers are able to be calibrated alongside one another in a single job.
The new system was completed at 2/3 the cost of the original system. It was completed on time and met all of the original design goals. This was a very large project to undertake as it involved circuit and PCB design, firmware design, software design, fluid dynamics, chemical compatibilities, and lots of research on all of these topics.100140+
Because of the commercial aspects of this project, this report will outline the tasks accomplished with enough detail to understand the project, but not enough for competitors to recreate what has been engineered here. If more information is required, please contact Apogee Instruments, Inc.