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This new version significantly enhances the previous capabilities by providing two additional features: signal digitization and time measurements.
It has been demonstrated that the high-frequency IF signal digitization can be performed by a pair of low-pass ∆Σ modulators.
We show how a commodity based system which employs Component Off The Shelf (COTS) devices, with Flash Analog to Digital Converters (FADCs) and Field Programmable Gate Arrays (FPGAs), can be used for synchronous signal digitization of multiple photomultiplier tubes.
First, this eliminates strong signal oscillations at the output of high-pass filters preceding signal digitization.
By converting the DOCT imaging system to the CGD sensing system, the reference phase modulator, reference path length scanning, signal digitization and demodulation processing can be omitted.
More commonly, searching extrema and crossings is done by software after the signal digitization, which is more flexible to clock settings and advanced algorithms, but needs a second A/D channel and computation.
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A solution consists in compressing the signal before digitization and linearizing it after with a look-up table, encoding the inverse of the compression function.
To show the aliasing effect more intuitively, the spectrum of the signal after digitization can be plotted onto a cylindrical surface which can indicate the periodic property of the digital spectrum and we call it "cylindrical spectrum".
Single-mode optical fibers will guide the light to 12-way pin diode arrays converting it back to electrical signals for digitization and processing.
Digital filters operate on digitized analog signals, so the digitization process is important and is critical in the system design.
To achieve this purpose, a 16-channel ASIC chip, PARISROC 2 (Photomultiplier ARray Integrated in SiGe ReadOut Chip) is used in the analog signal processing and digitization.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com