This paper presents studies of a passive wireless ultraviolet (UV) surface acoustic wave (SAW) sensor operating in the frequency range 436–440 MHz. The sensor contains two SAW delay lines (DLs). The first DL is measuring, and the second is the reference. In the measuring DL, receiving–transmitting inter-digital transducer (IDT) is connected to the antenna and the sensing element zinc oxide film. In the reference DL, the receiving–transmitting IDT is connected to another antenna and does not contain a UV-sensitive element. Two methods of information reading from the sensor are proposed: based on the Fourier transform of the frequency dependence of the parameter S11 of the reader antenna and using reading pulses of 1.5-μs duration, which have carrier frequencies corresponding to the central frequencies of the measuring and reference channels. The sensor can measure UV intensities from 10 to 40,000 μW/cm2 with a maximum sensitivity of 6000 ppm/(μW/cm2) at low intensities, and which rapidly decreases as the UV intensity increases (less than 100 ppm at the UV intensity of 40,0000 µw/cm2).

中文翻译：

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无源无线紫外线 SAW 传感器

本文介绍了在 436-440 MHz 频率范围内工作的无源无线紫外线 (UV) 表面声波 (SAW) 传感器的研究。传感器包含两条 SAW 延迟线 (DL)。第一个 DL 是测量，第二个是参考。在测量DL中，接收-发射叉指换能器（IDT）连接到天线和传感元件氧化锌膜。在参考 DL 中，接收-发送 IDT 连接到另一个天线，并且不包含紫外线敏感元件。提出了两种从传感器读取信息的方法：基于读取器天线参数 S11 的频率相关性的傅立叶变换和使用持续时间为 1.5 μs 的读取脉冲，其载波频率对应于测量的中心频率和参考通道。