KEYWORDS: Temperature metrology, Pyrometry, Calibration, Black bodies, Photodiodes, Diamond, Telescopes, Signal processing, Short wave infrared radiation
We have developed a time-resolved two-dimensional temperature monitoring system using shortwave infrared (SWIR) detection scheme for a nanocrystalline diamond foil under intense hydrogen ion beams with 1.4 MW average power at 1.0 GeV energy in harsh radiation environment. The optical system composed of a light collecting reflective telescope, dichroic and bandpass filters, SWIR and visible CMOS cameras combined with PIN photodiodes and image sampling pinhole mirrors. It receives thermal radiation located at 40 m from the measurement location. The optical design, optical calibration of the system with high temperature blackbody source, measurement results based on two-dimensional temperature mapping and uncertainties will be presented.
An off-axis Schmidt telescope based remote imaging system is under development for in-situ viewing of high-energy proton beam distribution at the Spallation Neutron Source. The optical architecture, design parameters and challenges of this design will be discussed.
An all-reflective telescope based optical pyrometer has been designed and built to collect thermal radiation from a nanocrystalline diamond foil in harsh radiation environment at the Spallation Neutron Source accelerator. The primary use of this instrument is to monitor the foil temperature remotely while it is being bombarded by negative hydrogen ion beams with 1.4 MW power at 1.0 GeV energy. The pyrometer is composed of 4.0” Cassegrain reflector with f/10 configuration, two InGaAs PIN photodiodes, a dichroic mirror, two bandpass filters centered around 1000 nm and 1550 nm, a CMOS camera, and a pinhole mirror with 200 um diameter hole size. It is located 40 m from the foil in the accelerator. The measurement uncertainties demonstrated in this work was better than 2.5% for the temperature range of 1000 K to 2500 K. The design of the optical system, calibration with blackbody source and the temporally resolved measurements made with this pyrometer will be presented.
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