目前市场上可获得的传统无线传感器设备都具有一系列缺点，这些缺点将限制其范围向前发展。
他们将无法应对日益增长的挑战性需求的新兴应用程序，并且需要采取一些措施来应对。
首先，这些无线传感器依赖于电池操作，这限制了他们在需要更换电池之前提供感测数据的时间。
与更换电池相关的成本可能很高。
如果传感器系统位于难以到达的远程位置，则需要工程师前往那里。
同样，在汽车场景中，例如轮胎压力监测器，它将需要车辆进行维修（这可能对用户来说既不方便又昂贵）。
其次，这些传感器设备将包含多个IC（例如无线收发器，激励检测器和支持外围IC），从而占用宝贵的PCB空间。
第三，当使用专用微控制器在每个节点本地后处理所感测的数据时，这些传感器实现往往非常昂贵。
此外，它们的高度复杂性要求在部署之后进行持续维护。
最后，通过在每个感测节点处具有处理和功率，这种解决方案通过大规模扩展是昂贵的。
这使得诸如一次性产品感测之类的应用程序部署成本太高。
工程师需要采用一种新方法，使无线传感器的功率，成本和空间效率更高。
这可以通过以下方式完成：
从其他来源（而不是电池）获取电力
将智能元件移离传感器所在的位置
无电池无线传感器的出现使得一系列主要优势得以实现。
通过这种无需电池即可运行的先进技术，可将多个传感器以及关键特性和功能集成到单个芯片上。
消除了对刺激检测器的需求，并且最重要的是，不再需要在每个感测节点处的微控制器单元。
感测数据被发送到远程中央处理集线器（通常称为询问器）。
随后进行后处理。
与现有传感器解决方案不同，单个处理单元可以同时为多个传感器提供服
无电池无线传感器具有极高的成本效益，并且在部署完成后证明自己几乎不需要维护。
无电池无线传感器的低成本规模使得基于该技术的系统能够解决新的服务不足的市场，例如一次性产品。
无电池无线传感器技术开辟了以前不可能实现的新市场和应用。
例如，在医疗领域内，水凝胶敷料由凝胶基质中的90％水组成，并有助于监测患者伤口表面内的液体交换。
通过保持伤口湿润，敷料有助于保护患者的身体免受伤口感染并促进有效的愈合。
目前，通过将石膏放在合成海绵上，漂浮在含有盐水溶液的塑料盒上来诱导吸收过程。
阅读器连续询问石膏，测量时间约为7小时，并且在RFID频带中以若干频率收集响应数据。
研究采用离散天线功率读数来推断水分含量。无电池无线传感器技术可以确定即时湿度和温度测量。
最后一个例子，无电池无线传感器可以在制造过程中直接嵌入到新的或翻新的混凝土板中。
这允许以分钟而不是天（以前的情况）测量水分含量。
因此，预测施工后的泄漏或基础问题将更快更容易进行。
这些只是这种技术的几种方式，注定要产生真正的影响。
要了解有关安森美半导体在物联网技术方面的专业知识的更多信息，您可以参加公司代表将在物联网世界（5月10日至12日，加利福尼亚州圣克拉拉市圣克拉拉会议中心）举办的一系列演讲。
'高级无线＆amp;
无电池传感器技术可在物联网实施中更有效地使用感知数据，由Gary Straker提供 - 周三11月5日下午4:30
“理解并应对物联网射频收发器的独特挑战”由Ryan Cameron主讲 - 5月12日星期四，下午2:20
“物联网的愿景：图像传感器如何影响下一代连接设备”由Radhika Arora主讲 - 5月12日周四，下午2:00。
以上来自于谷歌翻译
以下为原文
The conventional wireless sensor devices that are currently available on the market all have a series of drawbacks that will limit their scope moving forwards. They will not be able to address emerging applications with increasing challenging demands and something needs to be done in response.
First, these wireless sensors rely on battery operation, which restricts the time they can provide sense data before they need to have their batteries replaced. The costs associated with replacement of batteries can be substantial. If the sensor system is in a remote location that is difficult to get to, it will call for an engineer to travel there. Likewise, in automotive scenarios, such as tire pressure monitors, it will require the vehicle to go in for servicing (which can prove inconvenient for the user as well as costly).
Secondly, these sensor devices will contain multiple ICs (such as the wireless transceiver, stimulus detector and supporting peripheral ICs), thereby taking up valuable PCB space. Thirdly as sensed data is post processed locally at each node using a dedicated microcontroller, these sensor implementations tend to quite expensive. Furthermore, their high level of complexity mandates on-going maintenance after deployment. Finally, these kind of solutions are costly to scale to large volumes by having the processing and power at every sensing node. This makes applications such as disposable product sensing too expensive to deploy.
Engineers need to take a new approach that will make wireless sensors more power, cost and space efficient. This can be done by:
- Drawing power from other sources (rather than the battery)
- Moving the intelligence element away from where the sensor is situated
The advent of Battery-free Wireless Sensors is enabling an array of major benefits to be derived. Through this advanced technology, which operates without the need for a battery to be present, multiple sensors as well as key features and functionality can be integrated on to a single chip. The need for a stimulus detector is eliminated, and most importantly there is no longer a requirement for a microcontroller unit at each sensing node. Sensed data is sent to a remote central processing hub (commonly referred to as the Interrogator). Here post processing is subsequently carried out. Unlike existing sensor solutions, the single processing unit can serve multiple sensors at once.
The Battery-free Wireless Sensors are highly cost effective, and prove themselves to be virtually maintenance-free once deployment is completed. The low cost to scale of battery free wireless sensors allows for systems based on this technology to address new underserved markets such as disposable products.
Battery-free Wireless Sensor technology opens up new markets and applications previously impossible. Within the medical segment, for example, Hydrogel dressings consist of 90% water in a gel base, and help monitor fluid exchange from within the wound surface of the patient. By keeping the wound moist, the dressing assists in protecting the patient’s body from wound infection and promotes efficient healing. Currently, an absorbing process is induced by placing the plaster on a synthetic sponge, floating on a plastic box containing a saline water solution. The plaster is continuously interrogated by the reader, for a measuring period of about 7 hours, and the response data is collected at several frequencies in the RFID band. Research takes discrete antenna power readings to deduce moisture levels.Battery-free Wireless Sensor technology will enable instant moisture and temperature measurements to be determined. One final example for you, Battery-free Wireless Sensors can be embedded directly into new or refurbished concrete slabs during the fabrication process. This allows moisture levels to be measured in minutes, rather than days (as was previously the case). Predicting leaks or foundation problems post-construction will thus be made quicker and easier to undertake. These are just a few ways in which this technology, is destined to make a real impact.
To learn more about ON Semiconductor’s expertise in IoT technology you can attend a series of presentations that company representatives will be giving at IoT World (10th - 12th May, Santa Clara Convention Center, Santa Clara, CA).
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‘Advanced Wireless & Battery-Free Sensor Technology Enables More Effective Use of Sense Data in IoT Implementations’
Presented by Gary Straker - Wednesday 11th May, 4:30PM
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‘Understanding and Meeting the Unique Challenges for RF Transceivers for IoT’
Presented by Ryan Cameron - Thursday 12th May, 2:20PM
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‘Vision for IoT: How Image Sensors Are Set To Influence the Next Generation of Connected Devices’
Presented by Radhika Arora - Thursday 12th May, 2:00PM.
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