Photodiode-Based Spectrophotometer
Di Giorgio, Giuseppe (2023)
2023
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:amk-2023060220665
https://urn.fi/URN:NBN:fi:amk-2023060220665
Tiivistelmä
A spectrophotometer device supplies a light source at a stable frequency, and has a sensor that is capable of reading the light frequency after it has hit or been through a material. The device can identify the chemical elements, measure the concentration of it in a solution or identify impurities in it.
The goal of this thesis work was to learn the process of designing a spectrophotometer after studying the principles that regulate spectrometry and, in the end, measure its range. This thesis is a learning tool to better understand the concept, the studies and finally the device.
This thesis presents the process to design and test a portable spectrophotometer. The device is a proof-of-concept and will stay permanently at the stage of prototype. The measurements were done with a multimeter.
The results showed that the white LED is sufficient to the measurement of the of the concentration of the solution. The RGB LED did not produced results that are considered reliable enough but some of measurements showed that a different colour LED can enhance the sensitivity of the device at specific frequencies. The possibility of calibrating the device it with a camera could make a difference.
The goal of this thesis work was to learn the process of designing a spectrophotometer after studying the principles that regulate spectrometry and, in the end, measure its range. This thesis is a learning tool to better understand the concept, the studies and finally the device.
This thesis presents the process to design and test a portable spectrophotometer. The device is a proof-of-concept and will stay permanently at the stage of prototype. The measurements were done with a multimeter.
The results showed that the white LED is sufficient to the measurement of the of the concentration of the solution. The RGB LED did not produced results that are considered reliable enough but some of measurements showed that a different colour LED can enhance the sensitivity of the device at specific frequencies. The possibility of calibrating the device it with a camera could make a difference.