A portable gas sensing Device Based on Imageprocessing
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Date
2018
Journal Title
Journal ISSN
Volume Title
Publisher
Uva Wellassa University of Sri Lanka
Abstract
There are various kind of gases that evolving from common applications in the
industrial, automotive, medical, laboratory and environmental areas. Most of the
gases are hard to identify due to the location they release and difficult to capture them.
Any gas released is inconvinient to carry them to a laboratory for identification.
Currently available laboratory devices that used for gas sensing are expensive due to
their advanced technology. Therefore, a cost effective special instrument consists
with simple technology is require as a solution. This research will be helpful to fulfil
above requirements. The device is especially designed for the industrial and
laboratory purposes. At the beginning, system was developed to detect Ammonia gas.
Concentration series of 25 ml sample solution were made by adding 1 ml of Nesller
(mercury II Chloride 2.5%) with different Ammonia volume. Colour changes of
Ammonia gas with Nessler solution were monitored by an image. Images were
captured using Y3-Huawei phone camera, which have 480x854 screen resolution
with 5 mega pixels. ROB measurement of images were obtained using the MATLAB
2014a Software. UV spectrometer data of the same samples were obtained at same
time. RGB Values and UV spectrometer data were analyzed statistically. Minimum
detection level of Ammonia gas was found as 0.091 ppm. The average Absorbance
with Concentration (mol dm-3
, Ammonia) are statistically significant with absorbance
at 0.03 level of significance and percentage of variance is 96.5%. The average Red
colour with concentration (mol dm 3, Ammonia) are statistically significant with
average red colour 0.012 level of significance and percentage of variance is 91.1%.
Green and blue Variance are lower than red. Compared to three colours, red colour
was best for the Ammonia gas Analysis. This research can be extended later for other
gases, which give colour changes with chemicals such as CO2, SO2 with potassium
dichromate (VI), and H25 gas with lead acetate etc. Also, as an extra application this
research can be extended for any colour measurement application like tea, paint, and
dye colour analysis.
Keywords: Image processing, automotive, RGB, pixels, Absorbance
Description
Keywords
Computer Science, Information System