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Registered Member #1938
Joined: Sun Jan 25 2009, 12:44PM
Location: Romania
Posts: 699
I am not new to Gamma Spectrometry, and have done a few experiments with a scintillation probe in the past: Probe+PC+audio card+PRA+Intune and a TG-77 tube as Cs137 source (some of that stuff still available here)
Recently I received a NaI probe as an unexpected donation, namely it is the UT50 probe, made in Romania, that uses the EMI9656 PMT and a HUGE NaI crystal, at least it is bigger than anything I had previously access to, with a 5.5cm diameter, and 5.5cm length. Pictures: More pics in an article that I've published recently:
For this probe, I started by designing a complete portable spectrometer unit. A microcontroller with an ADC port and a sample and hold circuit for getting the pulses and converting the amplitude to digital, and a bluetooth module to export all data to an Android phone to display the spectrum and take advantage of the nice color screen and touch screen capabilities for various options/configuration. This is what I did so far:
Complete details here: To summarize the circuit supports the following: - the power supply: 3-5V with inverter and regulator both for battery and power adapter use; - the digital temperature sensor: for compensating the temperature drift; - the Bluetooth module for interfacing with the Android phone; - the regulated high voltage module: PWM driver, ferrite transformer (see above), 4 stage voltage multiplier with voltage feedback on level 1 for regularization, output high voltage capacitor as filter; - PMT preamplifier with 2 bipolar transistors - sample and hold circuit for converting the PMT pulses to digital via ADC, using the LM358 op amp. - small size: using SMD components, the entire board is only 6 x 6 cm big!
My plan is to continue with my own design based on AVR microcontrollers paired with a smartphone over Bluetooth, so my idea was to show it here, and hopefully get some valuable feedback.
Registered Member #1938
Joined: Sun Jan 25 2009, 12:44PM
Location: Romania
Posts: 699
The board is ready:
And so is the first software block, enough to run the Bluetooth Module , the inverter and the temperature sensor, and debug everything via the serial Bluetooth link:
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Gamma Spectrometer and Android Phone
