Handheld Radiation Survey Meter with Extendable Fiber Optic Probe
Inventor
The developed system consisted of a handheld unit (designed during the project and fabricated using 3D printing), operated on a battery, that accepts an optical fiber input. Signal arrives in the handheld system from a miniature detector (based on LYSO:Ce scintillator custom dimensions), that is attached to the far end of a 12.5m optical fiber channel. This signal is acquired by a silicon photomultiplier (SiPM) which was processed by in-house pre-processing and amplification modules capable of handling signals up to 450MHz and typical power consumption of 40mA. Pulse counting was accomplished by an 8-bit microcontroller-based. The battery life of the complete setup was recorded at roughly 33+ hours on a single charge. Readings were displayed on a digital LCD screen embedded in the device. The device was also fitted with an alert red LED and buzzer that was activated when a pre-set threshold level of radiation was detected. The complete setup is served by a 3.7V Li-ion rechargeable battery.