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Freebase(0.00 / 0 votes)Rate this definition: OSIsoft. OSIsoft, LLC is a worldwide manufacturer of Application software for real-time data infrastructure solutions, called the PI System. Founded in 1980, OSIsoft, LLC is privately held and headquartered in San Leandro, CA, with operations worldwide.
OSL (Optically Stimulated Luminescence) detector is made of aluminum oxide crystals (Al2O3:C). OSL dosimeters measure the amount of radiation exposure by stimulating the Al2O3 material with green light from either a laser or light emitting diode source.