We design, test, and analyze fiber-optic voltage sensors based on optical reflection from a piezoelectric transducer. By controlling the physical dimensions of the device, we can tune the frequency of its natural resonance to achieve a desired sensitivity and bandwidth combination. In this work, we fully characterize sensors designed with a 2 kHz characteristic resonance, experimentally verifying a readily usable frequency range from approximately 10 Hz to 3 kHz. Spectral noise measurements indicate detectable voltage levels down to 300 mV rms at 60 Hz, along with a full-scale dynamic range of 60 dB, limited currently by the readout electronics, not the inherent performance of the transducer in the sensor. Additionally, we demonstrate a digital signal processing approach to equalize the measured frequency response, enabling accurate retrieval of short-pulse inputs. Our results suggest the value and applicability of intensity-modulated fiber-optic voltage sensors for measuring both steady-state waveforms and broadband transients which, coupled with the straightforward and compact design of the sensors, should make them effective tools in electric grid monitoring.

中文翻译：

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用于配电系统的强度调制光纤电压传感器

我们基于压电换能器的光学反射设计、测试和分析光纤电压传感器。通过控制设备的物理尺寸，我们可以调整其自然共振的频率，以实现所需的灵敏度和带宽组合。在这项工作中，我们充分表征了设计有 2 kHz 特征谐振的传感器，通过实验验证了大约 10 Hz 到 3 kHz 的易于使用的频率范围。频谱噪声测量表明，在 60 Hz 时可检测到低至 300 mV rms 的电压水平，以及 60 dB 的满量程动态范围，目前受读出电子设备的限制，而不是传感器中换能器的固有性能。此外，我们展示了一种数字信号处理方法来均衡测量的频率响应，能够准确检索短脉冲输入。我们的结果表明，强度调制光纤电压传感器在测量稳态波形和宽带瞬态方面的价值和适用性，再加上传感器的直接和紧凑设计，应该使它们成为电网监测的有效工具。