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Measurement of Glucose in Aqueous Solution Using a Proton Magnetometer

CSEF · 2012 Electronics & Electromagnetics Honorable_mention Award

Sean W. Kelley · Palos Verdes Peninsula High School, Rolling Hills Estates, Los Angeles County

Overview

Objectives/Goals My hypothesis is that if the glucose concentration is varied in an aqueous solution then by using a proton magnetometer, with a two coil relay system, the glucose concentration can be determined by measuring the frequency, amplitude, decay constant, and Q (inverse bandwidth) of the resonance Methods/Materials Two coils were created out of 18 gauge wires around a 5.8cm diameter and 7.8cm long around a PVC pipe. Each coil contains 600 turns of wire with a resistance of 4ohms and 21.34mH of inductance. A rely system was created to connect the coils to power and switch to a National Instruments measurement unit. The experiment began by activating a switch which connected the coils to power for approximately 2.4 seconds. Then the coil was then disconnected from power and reconnected to the measurement unit. Results A total of 9 trials were conducted; 7 were with glucose dissolved in 125ml of water from 0.79% to 7.5%, 1 was with only 125ml of water and 1 was with no solution. The one trial of water showed a singular resonance peak at 2006Hz, while the one trial without solution showed no resonance peak at all. The 7 trials with glucose showed that the concentration affected the amplitude, Q factor and decay constant of the peak resonance frequency. Conclusions/Discussion The experiment confirmed part of my hypothesis in that I measured a difference in the peak resonance amplitude but I measured no difference in the resonance frequency and thus disproved that part of my hypothesis. In addition, I also found that the concentration of glucose altered the Q factor and the decay constant. This study shows that it is physically possible to noninvasively measure glucose which has not been done before.

Summary statement

My project is about using a proton magnetometer to measure the concentration of glucose dissolved in water.

Help received

Father helped build proton magetometer, Mr. Joseph Geller provided designs for proton magnetometer

Awards (1)

  • Honorable Mention

Competition history

  • CSEF 2012 Electronics & Electromagnetics · Entry S0906

Resources

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