If a worker wants to do something good, he must first sharpen his tools. In today’s globalized world, patents are not only a means of protecting innovation but have also become a powerful tool in the commercial battlefield. Mames Consulting has developed a patent operation platform tailored for MEMS, sensors, and IoT technologies. By integrating intellectual property resources across the entire industry chain, they actively promote the protection and efficient utilization of IP. With the rapid development of energy harvesting and low-power electronics, the industry is now offering various self-powered wireless sensor node solutions. Among these, the "event-driven" mechanism stands out as a crucial technology in wireless sensor network deployment.
In many "event-driven" scenarios, we're primarily concerned with whether a monitored physical quantity crosses a certain threshold—like whether an impact on a pipeline is enough to compromise its structure. In such cases, continuous and precise acceleration data is often unnecessary. Maintaining high accuracy requires more power, which increases both maintenance complexity and cost. The "event-driven" sensing mechanism helps reduce this burden by compressing data and saving energy, making it a smarter and more sustainable approach.
Take an oil pipeline as an example. An "event-driven" energy harvester is installed along the pipeline. When no external forces are acting on it, the device produces almost no output. However, when an external event causes vibrations or shocks that exceed a preset threshold, the energy harvester generates a significant amount of power. This energy is then detected by the subsequent circuitry, which triggers an alarm signal via the RF transmission module. The signal can be simple, just containing the location of the damaged section. In this setup, the sensor and energy harvester are combined into one unit, eliminating the need for separate power sources or complex signal processing. This greatly simplifies the design of the sensing node and enhances system reliability.
The diagram above illustrates the vibration mode of a two-stage vibrator in the energy harvester when external vibrations meet or exceed a set threshold. The harvester consists of a first-stage vibrator, responsible for detecting external vibrations, and a second-stage vibrator, which generates electricity. At the free end of the first stage, a rectangular magnet and a mass are fixed on the top and bottom surfaces, respectively. On the upper end of the second stage's free end, another rectangular magnet is attached. The fixed end of the second stage includes a lower electrode, a piezoelectric film, and an upper electrode. This vibration-sensing energy harvester has a specific driving threshold. It does not produce electricity if the environmental vibration amplitude is below the threshold but converts mechanical energy into electrical energy when the amplitude exceeds it. The generated AC is rectified and stored in the energy conversion and storage unit. Once the control circuit detects sufficient energy accumulation, it activates the wireless transmission module to send an alarm or alert signal, indicating the occurrence of an event.
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