Using Trans-Impedance Amplifier and Smoothing Techniques to Improve Signal-To-Noise Ratio in a 24-Bit Single Beam Visible Spectrometer
Using charge-coupled devices and CMOS sensors in spectrometers increases device cost due to complex circuitry
requirements. In this work, a single beam visible spectrometer is designed and built using a single photodiode as a sensor and
a simple circuitry hence reducing the cost of the device. Moreover, on the market, most of the spectrometers use 16-bit
analog to digital converter to convert analog signal thereby limits the measurement concentration resolution and sensitivity
of the spectrometers. To extend its ability, a 24-bit ADC is used in the design for more accurate spectrum measurements.
This single beam visible spectrometer works in the spectral range from 400nm to 750nm. The use of the trans-impedance
amplifier and smoothing sensor reduces noise and increases accuracy of the measured spectrums.
Keywords - Visible light spectrometer, noise, photodiode, filter.