On that week, some other students and I who were doing project using optical/laser instruments gather at the lab we are suppose to use to run our project. It is located at the main campus. The students were briefly discussed based on their study. For my project, my supervisor and I have decided to make a liquid concentration sensor on detecting sodium chloride concentration (salt solution).
Basic setup where we have a transmitter and a receiver. In between the two devices will be placed a loop fiber which is cladded at certain length immersed into different level of sodium chloride concentration. The setup requires a laser source of 1550nm wavelength as it proven to provide optimum performance in optical sensor. The reading will be taken in decibel (dB). The loop diameter will be fixed at a diameter by using a washy tape. The changes in measurement will be happening at the place where the stripped fiber exposed to the salt concentration. This is due to the changes in reflected light rays that continue propagating to the receiver. The expectation is based on the theory of light where light reflect and refract differently depends on the medium they are hitting. What does the difference in concentration effect the value of power loss.
How many level concentration of sodium chloride I'll be doing for this project? As suggested, it will be proper experiment if I have five different level of concentration. I'll be studying the sensor performance at 10%, 30%, 50%, 70% and 100% of sodium chloride concentration. The made of the concentration will be done using ratio of water used and scoops of salt.
Like usual experimental study, the measurement must be done for several times, three times at least. Final decision of choosing the most sensitive sensor using the average reading.
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