Optimized design of photodiode amplifier circuit and its application in gas sensing

Dandan Sun

doi:10.1117/12.2579288

5 November 2020 Optimized design of photodiode amplifier circuit and its application in gas sensing

Dandan Sun

Proceedings Volume 11567, AOPC 2020: Optical Sensing and Imaging Technology; 115671G (2020) https://doi.org/10.1117/12.2579288
Event: Applied Optics and Photonics China (AOPC 2020), 2020, Beijing, China

Abstract

Using the output of the photodiode as a current source, and then introduce an operational amplifier to convert the photo-generated current to voltage becomes a typical photodiode amplifier circuit. The seemingly simple circuit faces a difficult problem when detecting weak photo-generated current: the photosensitive surface of the diode and the resistor using for current-voltage conversion need to be enlarged as much as possible to increase the output amplitude. However, this will result in a reduction in the bandwidth of the photodiode amplifier circuit, a reduction in stability, and an increase in noise. It was therefore decided to introduce software to assist in circuit design for the improving of performances of circuit. To assessing the applicability, the photodiode amplifier circuit was matched with other optoelectronic devices such as laser driver, temperature controller and lock-in amplifier, and employed in wavelength modulation spectroscopy (WMS) for NH3 detection at its P(6) absorption line belonging to the ν3 + ν4 combination band. Under the experimental conditions of room temperature (296 K), normal pressure (1.01e5 Pa) and an effective absorption path length of 10 cm, the experiments were conducted using five samples with their concentrations ranging from 500ppm to 1%, and a 1.3ppm detection limit was deduced from the linear regression analysis. The results not only indicate that the photodiode amplifier circuit has great potential in other trace material detection applications based on absorption spectroscopy, but also reflect from the side that the method of using simulation software to assist circuit design is highly feasible.

Citation Download Citation

Dandan Sun "Optimized design of photodiode amplifier circuit and its application in gas sensing", Proc. SPIE 11567, AOPC 2020: Optical Sensing and Imaging Technology, 115671G (5 November 2020); https://doi.org/10.1117/12.2579288

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KEYWORDS

Photodiodes

Amplifiers

Optical amplifiers

Capacitors

Signal detection

Absorption

Modulation

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