A New Method to Detect Zeolite Breath Sensor Response Based on Low-Power Square-Wave Sources



Abstract Views
274

Downloads
225

Citations

Share

##plugins.themes.bootstrap3.article.sidebar##

Submitted Oct 12, 2019
Published Oct 28, 2019
10.24018/ejeng.2019.4.10.1594

Abstract viewed = 274 times

Table of Contents

##plugins.themes.bootstrap3.article.main##

Low-power A.C. generators of square-wave or sinusoidal signals can be used in combination with impedimetric sensors to detect stimuli on the basis of the voltage drop taking place at the sensor electrodes. When a.c. generators with a power of only a few µ-Watts are used, this approach becomes extremely sensitive. A very low-power generator is the LCD back panel driving signal, which has a flipping polarity with a voltage of 3-5Vpp, depending on the generator model. This type of square-wave generator is contained in many low-cost handheld digital multimeters, and it is used as signal tracer to test, for example, low-frequency amplifiers. As an example, this method has been used to acquire a human breath rate pattern, by using a zeolite-based water sensor. If the generator I-V characteristics has been measured, the achieved breath pattern can be converted from a voltage drop vs. time graph to an impedance or current intensity vs. time graph.

Keywords: Breath Sensor Impedance Low-Power Square-Wave Generators Voltage Drop Zeolite

Downloads

Download data is not yet available.

References

  1. A. Aliverti, “Wearable technology: role in respiratory health and disease”, Breathe, vol. 13(2), pp. e27-236, 2017.
     Google Scholar
  2. B.W. An, J.H. Shin, S.Y. Kim, S. Ji, J. Park, Y. Lee, J. Jang, Y.-G. Park, E. Cho, S. Jo, and J.-U. Park, “Smart sensor systems for wearable electronic devices”, Polymers, vol. 9(8), pp. 303-343, 2017.
     Google Scholar
  3. M. Stoppa, and A. Chiolerio, “Wearable electronics and smart textiles: a critical review”, Sensors, vol.14(7), pp. 11957-11992, 2014.
     Google Scholar
  4. H.E. van den Brom, E. Houtzager, S. Verhoeckx, Q.E.V.N. Martina, and G. Rietveld, “Influence of sampling voltmeter parameters on RMS measurements of Josephson stepwise-approximated sine waves”, IEEE Transactions on Instrumentation and Measurement, vol. 58(10), pp.3806-3812, 2009.
     Google Scholar
  5. I.N. Zhelbakov, “Low-frequency accuracy of rms voltmeters”, Measurement Techniques, vol. 40(2), pp. 30-33, 1997.
     Google Scholar
  6. Z. Chen, and C. Lu, “Humidity sensors: a review of materials and mechanisms”, Sensor Letters, vol. 3(4), pp. 274-295, 2005.
     Google Scholar
  7. J. Heikenfeld, A. Jajack, J. Rogers, P. Gutruf, L. Tian, T. Pan, R. Li, M. Khine, J. Kim, J. Wang, and J. Kim, “Wearable sensors: modalities, challenges, and prospects”, Lab on Chip, vol. 18(2), pp. 217-248, 2018.
     Google Scholar
  8. G. Carotenuto, “Isothermal kinetic investigation of the water-cations interaction in natural clinoptilolite”, European Journal of Engineering Research and Science vol. 4(5), pp. 119-125, 2019.
     Google Scholar