Interchangeable Range of Ozone Concentration Simulation for Low Cost Reconfigurable Brass Gas Cell

Ultraviolet absorption spectroscopy is reliable for ozone concentration measurement. Concentration range and optical path length are inversely related based on theoretical calculation and observation of previous work. However, gas cells for ozone application are typically not expandable. In addition, they incur cost for custom fabrication. Here we design a reconfigurable brass gas cell that may interchange optical path length between 5.6 cm and 10.8 cm. Components are available at low cost, easy to joint and ready to use. Theoretical background and gas cell structure are discussed. Practical transmittance values between e -0.65 and e -0.05 are proposed for theoretical calculation of concentration via Beer-Lambert law. The concentration values are used in SpectralCalc.com gas cell simulation to obtain transmittance. Both approaches yield comparable result. Simulation result shows concentration range of 5.6 cm optical path length gas cell ( 31.82 ppm to 413.67 ppm ) is wider than concentration range of 10.8 cm optical path length gas cell ( 16.50 ppm to 214.49 ppm ). Simulation condition is at transmittance from 0.5291 to 0.9522, sampling wavelength 253.65 nm, temperature 300 K and pressure 1 atm. Thus, we strongly recommend short optical path length gas cell (5.6 cm) for wide range of concentration measurement ( 31.82 ppm to 413.67 ppm ).

[1]  C. Fitzpatrick,et al.  Ozone Measurement Using Optical Fibre Sensors in the Visible Region , 2005, IEEE Sensors, 2005..

[2]  J. Smilanick,et al.  Effect of continuous 0.3 μL/L gaseous ozone exposure on fungicide residues on table grape berries , 2012 .

[3]  A. Hearn.  The Absorption of Ozone in the Ultra-violet and Visible Regions of the Spectrum , 1961 .

[4]  S. M. Cepero,et al.  Ozone Application for Postharvest Disinfection of Tomatoes , 2010 .

[5]  L. Fialdini,et al.  Optical sensor for ozone detection in Medium Voltage switchboard , 2008, 2008 IEEE Sensors.

[6]  T. Frost,et al.  UV spectroscopy : techniques, instrumentation, data handling , 1993 .

[7]  Peter Brimblecombe,et al.  Energy and the atmosphere. A physical-chemical approach. 2nd ed: By I. M. Campbell. Pp. 337. Wiley, Chichester. 1986. Paperback £13.50 , 1987 .

[8]  Bhupinder Kaur,et al.  Ozone-induced changes of antioxidant capacity of fresh-cut tropical fruits , 2010 .

[9]  P. Bourke,et al.  Ozone Processing for Food Preservation: An Overview on Fruit Juice Treatments , 2010 .

[10]  L. De Maria,et al.  A Fiber-Optic Multisensor System for Predischarges Detection on Electrical Equipment , 2012, IEEE Sensors Journal.

[11]  Costas A. Varotsos,et al.  A new tool for the study of the ozone hole dynamics over Antarctica , 2012 .

[12]  Naoyuki Shimomura,et al.  Investigation of Ozone Concentration Measurement by Visible Photo Absorption Method , 2013 .

[13]  I. Campbell.  Energy and the Atmosphere: A Physical-Chemical Approach , 1977 .

[14]  H. Ewald,et al.  High resolution led-spectroscopy for sensor application in harsh environment , 2010, 2010 IEEE Instrumentation & Measurement Technology Conference Proceedings.

[15]  Hirofumi Takahara,et al.  Recent Developments in Food and Agricultural uses of Ozone as an Antimicrobial Agent-Food Packaging Film Sterilizing Machine using Ozone , 2008 .

[16]  M. MatJafri,et al.  Daily distribution Map of Ozone (O3) from AIRS over Southeast Asia , 2010 .

[17]  C. Fitzpatrick,et al.  An optical fibre based ultra violet and visible absorption spectroscopy system for ozone concentration monitoring , 2007 .

[18]  Hirofumi Takahara,et al.  Ozone Contribution in Food Industry in Japan , 2006 .

[19]  A. Abdullah,et al.  Ozone pollution and historical trends of surface background ozone level: a review , 2011 .

[20]  Development of an optical fibre sensor system for online monitoring of microwave plasma UV and ozone generation system , 2008, 2008 IEEE Sensors.

[21]  H. Ewald,et al.  UV LED-based fiber coupled optical sensor for detection of ozone in the ppm and ppb range , 2009, 2009 IEEE Sensors.

[22]  A. J. Meadows.  Energy and the Atmosphere: A Physical–Chemical Approach , 1978 .

[23]  C. Fitzpatrick,et al.  Optical fibre sensor for the measurement of ozone , 2005 .

[24]  Vertical ozone characteristics in urban boundary layer in Beijing , 2013, Environmental Monitoring and Assessment.

[25]  H. Hughes.  Beer’s Law and the Optimum Transmittance in Absorption Measurements , 1963 .

[26]  Yumi Ahiko,et al.  High-Sensitivity Ozone Sensing Using 280 nm Deep Ultraviolet Light-Emitting Diode for Detection of Natural Hazard Ozone , 2012 .

[27]  J. E. Norris,et al.  A study of systematic biases and measurement uncertainties in ozone mole fraction measurements with the NIST Standard Reference Photometer , 2006 .