Design of ICP-OES digital lock in amplifier based on DMD

Hui Liu; Yuqing Yang; LiuZhen Si; He Hu; Chunsheng Li; Di Tian

doi:10.1117/12.2666710

4 April 2023 Design of ICP-OES digital lock in amplifier based on DMD

Hui Liu, Yuqing Yang, LiuZhen Si, He Hu, Chunsheng Li, Di Tian

Proceedings Volume 12617, Ninth Symposium on Novel Photoelectronic Detection Technology and Applications; 126176G (2023) https://doi.org/10.1117/12.2666710
Event: 9th Symposium on Novel Photoelectronic Detection Technology and Applications (NDTA 2022), 2022, Hefei, China

Abstract

The digital Lock-In Amplifier (LIA) is a kind of weak signal detection equipment with high accuracy and strong selectivity. By using the Phase Sensitive Detection (PSD) technology, it can identify the measured signal with the same frequency as the reference signal and eliminate the interference of noise signals with different frequency from the reference signal. A new Inductively Coupled Plasma Optical Emission Spectrometer (ICP-OES), which uses Digital Micromirror Device (DMD) and Photomultiplier Tube (PMT) as the detector instead of Charge Coupled Device (CCD), can improve the detection ability for weak signals. This study focused on the design and working principle of the digital LIA based on DMD. At the same time the data acquisition system was integrated into the principal prototype of ICP-OES, and the mercury (Hg) lamp was used to conduct a comparative experiment between direct ADC acquisition and lock-in amplification acquisition. The Signal-Noise Ratio (SNR) of the LIA acquisition method was improved by three to five times at the 4×4 template reversal in the whole band range, and 1.7 times at the 1×1 template reversal at the wavelength of 253. 65nm.Finally, the standard sample of cadmium (Cd) element is detected. The experimental results show that the digital lock-in amplifier based on DMD modulation optimizes the performance of the acquisition system, improves the signal to noise ratio of the spectral line signal, and enhances the sensitivity of the ICP-OES instrument.

Citation Download Citation

Hui Liu, Yuqing Yang, LiuZhen Si, He Hu, Chunsheng Li, and Di Tian "Design of ICP-OES digital lock in amplifier based on DMD", Proc. SPIE 12617, Ninth Symposium on Novel Photoelectronic Detection Technology and Applications, 126176G (4 April 2023); https://doi.org/10.1117/12.2666710

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KEYWORDS

Digital micromirror devices

Analog to digital converters

Signal to noise ratio

Data acquisition

Analog electronics

Signal detection

Computing systems

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