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首页> 外文期刊>Optical engineering >Compact laser radar based on a subnanosecond laser diode transmitter and a two-dimensional CMOS single-photon receiver
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Compact laser radar based on a subnanosecond laser diode transmitter and a two-dimensional CMOS single-photon receiver

机译：基于亚纳秒激光二极管发射器和二维CMOS单光子接收器的紧凑型激光雷达

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摘要

A pulsed TOF laser radar utilizing the single-photon detection mode has been implemented, and its performance is characterized. The transmitter employs a QW double-heterostructure laser diode producing 0.6 nJ/100 ps laser pulses at a central wavelength of ～810 nm. The detector is a single-chip IC manufactured in the standard 0.35-μm HV CMOS process, including a 9 × 9 single-photon avalanche diode (SPAD) array and a 10-channel time-to-digital converter (TDC) circuit. Both the SPAD array and the TDC circuit support a time gating feature allowing photon detection to occur only within a predefined time window. The SPAD array also supports a 3 × 3 SPADs subarray selection feature to respond to the laser spot wandering effect due to the paraxial optics and to reduce background radiation-induced detections. The characterization results demonstrate a distance measurement accuracy of +/-0.5 mm to a target at 34 m having 11% reflectivity. The signal detection rate is 28% at a laser pulsing rate of 100 kHz. The single-shot precision of the laser radar is ～20 mm (FWHM). The deteriorating impact of high-level background radiation conditions on the SNR is demonstrated, as also is a Scheme to improve this by means Of detector time gating.
机译：已经实现了利用单光子检测模式的脉冲TOF激光雷达，并对其性能进行了表征。该发射器采用QW双异质结构激光二极管，在中心波长〜810 nm处产生0.6 nJ / 100 ps激光脉冲。该检测器是采用标准0.35-μmHV CMOS工艺制造的单芯片IC，包括一个9×9单光子雪崩二极管（SPAD）阵列和一个10通道时间数字转换器（TDC）电路。 SPAD阵列和TDC电路均支持时间选通功能，允许仅在预定义的时间窗口内进行光子检测。 SPAD阵列还支持3×3 SPAD子阵列选择功能，以响应由于近轴光学器件引起的激光光斑漂移效应，并减少背景辐射引起的检测。表征结果表明，在34 m处具有11％反射率的目标的距离测量精度为+/- 0.5 mm。激光脉冲率为100 kHz时，信号检测率为28％。激光雷达的单脉冲精度为〜20 mm（FWHM）。演示了高水平背景辐射条件对SNR的不断恶化的影响，以及通过检测器时间选通改善此情况的方案。

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