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首页> 外文期刊>Review of Scientific Instruments >A low-noise large dynamic-range readout suitable for laser spectroscopy with photodiodes
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A low-noise large dynamic-range readout suitable for laser spectroscopy with photodiodes

机译：低噪声大动态范围读数，适用于带有光电二极管的激光光谱

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摘要

An original low-noise large dynamic-range readout system for optical light spectroscopy with PIN diodes is presented. The front-end circuit is equipped with a smart device for automatic cancellation of the large dc offset brought about by the photodiode current. This device sinks away the exact amount of dc current from the preamplifier input, yielding auto zeroing of the output-voltage offset, while introducing the minimum electronic noise possible. As a result the measurement dynamic-range is maximized. Moreover, an auxiliary inspection point is provided which precisely tracks the dc component of the photodiode current. This output allows for precise beam alignment and may also be used for diagnostic purposes. The excellent gain stability and linearity make the circuit perfectly suited for optical-light pulse spectroscopy. Applications include particle sizing in the 100 nm range, two-dimensional characterization of semiconductor detectors, ultra-precise characterization of laser beam stability, confocal microscopy.
机译：提出了一种用于PIN二极管光学光谱的低噪声大动态范围读出系统。前端电路配有智能设备，可自动消除光电二极管电流带来的大直流偏移。该器件可从前置放大器输入中汲取精确量的直流电流，从而实现输出电压偏移的自动归零，同时引入尽可能低的电子噪声。结果，测量动态范围被最大化。此外，提供了一个辅助检查点，该点可以精确跟踪光电二极管电流的dc分量。该输出可实现精确的光束对准，也可用于诊断目的。出色的增益稳定性和线性度使该电路非常适合光学脉冲光谱。其应用包括在100 nm范围内的粒径测量，半导体检测器的二维表征，激光束稳定性的超精确表征，共聚焦显微镜。

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