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Measurements of ozone absorption cross section with ratiometric and non-ratiometric methods

Tay Ching En Marcus, Mohd Haniff Ibrahim and Nor Hafizah Ngajikin
 

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Abstract. In ultraviolet absorption spectroscopy, absorption cross section (ACS) is a parameter important for calculating ozone concentrations. In this work we have determined the ACS at the room temperature and normal pressure. The ozone concentration has been recorded in the region 450–989 ppm, using a compact aluminium gas cell of 5 cm optical path length. We have also compared the results derived with the ratiometric and non-ratiometric methods based on the Beer–Lambert law. Our experimental results demonstrate that the non-ratiometric method can compete with the ratiometric method whenever the measuring times are relatively short.

Keywords: absorption cross section, concentration, gas, ozone, ratiometric method, sensors

PACS: 07.07.Df, 33.20.Kf, 42.25.Bs, 42.79.Pw, 42.81.-i, 78.20.Ci
UDC: 542.7+535.3+681.7
Ukr. J. Phys. Opt. 16 61-67
doi: 10.3116/16091833/16/1/61/2015

Received: 29.01.2015

Анотація. В ультрафіолетовій спектроскопії поглинання перетин поглинання (ПП) є важливим параметром для розрахунку концентрації озону. У цій роботі визначено ПП за кімнатної температури та нормального тиску. Концентрацію озону вимірювали за допомогою компактної алюмінієвої газової комірки з довжиною оптичного шляху 5 см при концентраціях озону 450–989 млн−1. Ми також порівняли результати, одержані за логометричним і нелогометричним методами, які базуються на законі Буґера–Ламберта–Бера. Дані наших експериментів засвідчують, що нелогометричний метод може конкурувати з логометричним методом, якщо лише часи вимірювань порівняно малі. 
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