Photodetector Module for Recording Lidar Signals in the Near-Infrared Region
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TICAL INSTRUMENTATION
Photodetector Module for Recording Lidar Signals in the Near-Infrared Region A. I. Nadeeva, *, I. E. Pennera, **, and E. S. Shevtsova, *** a
V.E. Zuev Institute of Atmospheric Optics, Siberian Branch, Russian Academy of Sciences, Tomsk, 634055 Russia *e-mail: [email protected] **e-mail: [email protected] ***e-mail: [email protected] Received February 26, 2020; revised February 26, 2020; accepted March 11, 2020
Abstract—A basic platform for photodetector modules used in the lidar complex for recording backscattered radiation in the near-infrared region is described. High-voltage pulse noise of DC/DC converters in the photodetector modules are reviewed and tested. A method is proposed for compensating the noise generated by such converters. The tests carried out in the lidars of the Institute of Atmospheric Optics, SB RAS, showed the effectiveness of the module designed to record signals in analog mode at a wavelength of 1064 nm. Keywords: lidar, photodetector, avalanche photodiode, DC/DC converter DOI: 10.1134/S1024856020040089
INTRODUCTION Lidars for remote study of atmospheric parameters have long been used to monitor cloud and aerosol fields, trace gas components, and atmospheric meteorological parameters [1]. They operate in a wide range of wavelengths, from UV to far IR, which makes it possible to record various interactions of radiation with a multicomponent atmospheric medium. This necessitates the search for informative wavelengths for various sensing tasks [2]. The amount of information obtained from lidar sensing data is determined not only by the spectral and energy characteristics of the transmitter, but also by the quantum efficiency of the photodetectors in the spectral range of the radiation detected. For the visible range, photoelectronic multiplier tubes (PMTs) and silicon photodetectors are widely used in lidars [3]. But starting from the nearinfrared wavelengths (∼1 μm) the quantum efficiency of PMT and silicon photodetectors decreases to units of percent. The lidar signal in this range is recorded using standard and avalanche photodiodes [4] with enhanced NIR sensitivity. Based on such photodetectors, photodetector modules were created [5]. To optimize lidars with different optical schemes, photodetector modules are required, were photodetectors can be used different in the size of the active area and the bias voltage on the photodiode, which is set by the sensor temperature. It is not possible to use photodetector modules designed for a specific photodetector with other types of photodetectors.
We made the decision to develop and create a basic photodetector module for a large range of avalanche photodiodes, in which the bias voltage in the range 50–500 V, as well as the temperature of the photodetector and the signal gain over a wide range, are software controlled and supported with high accuracy. STRUCTURE OF THE PHOTODETECTOR MODULE To optimize the costs of developing a family of photodetectors, the devices in it are designed according to the modular principle. Some of these
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