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How to build and test an NQR spectrometer, which is similar to MRI, but uses no magnets. NQR frequencies are unique among all tested compounds, so detecting a resonance indicates a near certainty that a specific chemical is present.
Tektronix 2-series oscilloscope: www.tek.com/en/products/oscil... Video capture was done via VNC client
Zeeman effect shifting optical spectral lines: • Candle flame is repell...
Atomic clock calibration using Zeeman effect: • How an Atomic Clock Re...
W2AEW's RF tutorial on quarter wave transmission lines: • #200: T/R Switch w/ PI...
Water deflected by electric field: • How a liquid lens work...
Litz wire only helpful between 50KHz and 1.5MHz - • Resonant Magnet-Field ...
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Q/A
Why use vacuum variable capacitors? The parallel LC circuit develops well over 1000 volts during transmit, and they are much easier to finely adjust over a large range.
I've spent quite a few hours making this work since late last year. I failed to detect a signal from urea, which burned dozens of hours. Switching to NaNO2 suddenly produced a huge signal.
NQR calculations spreadsheet - docs.google.com/spreadsheets/...
NQR references (many!) : docs.google.com/document/d/1X...