Costa, Michael T. <br/><br/>
Development of a soil organic matter meter using ultraviolet and visible (UV/VIS) ligth spectroscopy 
/ Michael T. Costa 
 - DIS T 185  C67 2019 
 - 184p.:  Color illustration  28 cm.  +1 CD-ROM (4¾inches) 
<br/><br/> Dissertation 
<br/><br/>College of Industrial Education (CIE) 
<br/><br/> "A study is focused on the development of an electronic device that can measure Soil Organic Matter (SOM) content in a given soil sample using Ultra- Violet and Visible (UV/Vis) Spectroscopy. The prototype of the study was developed and fabricated from June 2014 to May 2015 at the Material Testing Laboratory of Cavite State University Main Campus in Indang, Cavite.<br/>The SOM content measurement was done through image processing. A phenomenon known as fluorescence causes some substances including organic matters emit light at visible wavelengths when exposed to Ultraviolet and Visible light spectrums. By capturing the amount of radiation through a camera, the image will then be sent to a computer to analyze and quantify the amount of SOM present in a given soil sample.<br/>The system was composed of two main parts, the UV/Vis LED array circuit and the computer which run the developed software to analyze SOM content. The camera used to capture reflected images is integrated to the LED array circuit.<br/>Through testing and evaluation of the prototype, the results were compared to the measured SOM using Loss on Ignition (LOI) method. Findings show that the measured quantities using the SOM Content Measuring Instrument do not differ with the measured quantities using LOI method. It is therefore concluded that the developed prototype is capable of measuring soil organic matter content with accuracy comparable to the manual method.-Author's abstract."<br/> 
<br/><br/><label>Subjects--Index Terms: </label>Ultraviolet (UV) Light spectroscopy Visible(VIS) 
<br/><br/><label>LC Class. No.: </label>DIS T 185   / C67 2019