IN SITU, REMOTELY INTERROGATABLE MAGNETOCHEMICAL SENSORS

原位远程询问磁化学传感器

基本信息

批准号：
2900918
负责人：
CRAIG A GRIMES
金额：
$ 8.33万
依托单位：
UNIVERSITY OF KENTUCKY
依托单位国家：
美国
项目类别：
财政年份：
1998
资助国家：
美国
起止时间：
1998-04-01 至 2000-03-31
项目状态：
已结题

项目摘要

DESCRIPTION: (Adapted from the investigator's abstract) This proposal seeks funding for the development of a new type of sensor that offers the opportunity for remote, in-situ, continuous, long term monitoring of given chemical stimuli. In its initial design the sensor is comprised of a thing polymeric layer made so that it swells in the presence of certain stimuli, bounded on each side by a magnetically soft thin film. For fixed magnetic layer design, the magnetic switching characteristics of the sensor 'sandwich' are a function of the thickness of the intervening polymeric spacer layer. Placed within a sinusoidal magnetic field the magnetization vector of the sensor periodically reverses directions, generating a series of voltage spikes in suitably located detecting coils. The general shape and magnitude of the voltage spikes are dependent upon how much the spacer layer has swollen or contracted in response to the given stimuli. Since the sensor is monitored through changes in magnetic flux, no physical connections such as wires or cables are needed to obtain sensor information, nor line of sight as needed with laser telemetry; the sensors can be placed within opaque or metallic enclosures such as people, hermetically sealed bags, etc. The polymeric chemistry is flexible and selective. The polymer swelling is due only to the functional group, it does not involve the polymer backbone. Therefore, the sensor will respond only to the given chemical analyte for which it has been designed. While the sensors are quite durable, the projected cost of the sensors is inexpensive enough to be readily used on a disposable basis. One detecting unit can serve an unlimited number of sensors; the technology would be ideally suited for monitoring contamination of blood supplies or foodstuffs through sensing for CO2 levels, in-vivo glucose or pH levels, moisture levels in sealed containers, metal ion pollutants in water pipes, etc. The primary research objectives of this proposed work are: (1) Precisely determine the variation in voltage with pH for the pH sensor and how it is affected by the thickness of the polymer and magnetic layers, and polymer formulation variables. (2) Develop technology for controlling sensor response times. (3) Refine sensor detection electronics. (4) Develop polymers or other space layer materials for applications including glucose, CO2, hydrogen sulfide and hydrazine. (3) Evaluate the robustness of the different polymer layers. (6) Translate developmental work to field demonstration units to promote application of the new sensor technology.

描述：（根据调查员的摘要改编）该提案寻求用于开发一种新型传感器的资金给定的远程，原地，连续，长期监控的机会化学刺激。在最初的设计中，传感器由一个东西组成聚合物层制成，使其在某些刺激的存在下膨胀，用磁性柔软的薄膜在两侧界定。用于固定磁性层设计，传感器的磁开关特性 “三明治”是中间聚合物厚度的函数垫片层。放置在正弦磁场内磁化传感器的向量定期逆转方向，生成系列位于适当的检测线圈中的电压尖峰。一般形状电压尖峰的大小取决于垫片多少层响应给定的刺激而肿胀或收缩。自从传感器通过磁通量的变化监测，无物理需要连接（例如电线或电缆）以获取传感器信息，激光遥测的视线也不是视线；传感器可以放置在不透明或金属围墙（例如人）中，密封袋子等聚合化学是柔性和选择性的。聚合物肿胀是仅由于功能组，它不涉及聚合物主链。因此，传感器将仅对给定的化学分析物响应它已经设计了。传感器非常耐用，但传感器的预计成本足够便宜，可以轻松地用于一次性基础。一个检测单元可以无限数量传感器；该技术非常适合监视污染通过感应二氧化碳水平感测的血液供应或食物葡萄糖或pH水平，密封容器中的水分水平，金属离子水管等中的污染物。建议的工作是：（1）精确确定电压的变化对于pH传感器及其如何受聚合物厚度的影响和磁层和聚合物配方变量。（2）开发技术用于控制传感器响应时间。（3）提炼传感器检测电子产品。（4）开发聚合物或其他空间层材料包括葡萄糖，二氧化碳，硫化氢和肼的应用。（3）评估不同聚合物层的鲁棒性。（6）翻译开发工作到现场演示单位，以促进新的传感器技术。