Field-deployable sensors

The development of compact, field-deployable sensors is highly desirable for prompt, on-site detection of active Bacillus anthracis bacteria, which would eliminate the need to send samples for diagnosis to a remote laboratory As a first step toward this goal, we describe the development of an OLED-based... 

In attempts to develop field-deployable sensors, efforts focus on, e.g., enhancing sensor performance, reducing sensor cost and size, and simplifying fabrication. We are therefore developing a compact PL-based O2 sensor to evaluate a fully integrated platform, where the PL excitation source is an OLED array and the PD is a p-i-n structure based on thin films of hydrogenated amorphous Si (a-Si H) and related materials, or nanocrystalline Si [18]. 

Autonomous Field-Deployable Sensors for Biological Agents... 

A number of fiber optic-based systems have been described for CE-LIF systems. " These systems boast a small footprint, and the terminal of the fiber optic can be placed exceedingly close to the detection window, thus enabling high collection efficiency. Hence, fiber optics are an excellent choice for systems where the overall footprint must be kept to a minimum, such as field-deployable sensors or lab-on-a-chip applications. 

The crucial missing part in this scenario is the gateway through which these worlds will communicate how can the digital world sense and respond to changes in the real world Unfortunately, it would appear from the lack of field deployable devices in commercial production that attempts to integrate molecular sensor science into portable devices have failed to bear the fruits promised this problem is what we call the chemo-/biosensing paradox.4... 

As the volume of manufactured OLEDs increases, their eventual cost will drop to the point of disposability. Thus, the integrated OLED platform will address the need for field deployable, compact, low cost, user-friendly, and autonomous sensors. 

Despite the established sensing approach, in particular for gas phase measurements, extensive studies of optical O2 sensors are still continuing in an effort to enhance sensor performance, reduce sensor cost and size, simplify fabrication, and develop an O2 sensor that is compatible with in vivo biomedical monitoring [56]. Development of field deployable, compact sensors such as those envisioned for the structurally integrated OLED-based platform is therefore expected to be beneficial for the varied needs of gas... 

Other biological agents wifi require additional components for a field-deployable autonomous OLED-based sensors. For example, the OLED-based... 

Despite the numerous reports, extensive studies of optical O2 sensors are still ongoing to improve performance, reduce cost and size, and develop an O2 sensor for in znvo applications/" The large market for O2 sensors also drives these efforts. The development of field-deployable, compact, low-cost monitors such as those based on OLEDs is therefore highly attractive for gas-phase and DO monitoring in various biological, medical, environmental, and industrial applications. "" ... 

In other instances, where analyte-sensitive dyes with a narrower Stokes shift are utilized, the contribution of the long-wavelength EL tail to the background can be large, reducing the detection sensitivity and deteriorating the LOD. An example for that behavior is that of a sensor for anthrax lethal factor (LF), which is one of the three proteins of the anthrax toxin secreted by the live Bacillus anthracis bacterium. The development of a compact, field-deployable, and low-cost sensor for prompt, on-site detection of... 

Hungary Chemical Agent Sensor GVJ-2 - Ion mobility spectrometric detection of nerve and blister agents Remote Chemical Agent Sensor VTB-1 - Field deployable laser radar for the detection of chemical warfare agents... 

Figure 28.5 Field-deployed TDLAS spectrometer for eddy-correlation trace-gas measurements. The gas sampling head (on the left) incorporates a non-dispersive IR H2O/CO2 sensor and an anemometer. Adapted from Werle and Korman, Appl. Opt., 2001, 40 846, with permission of The Optical Society of America...

The actual challenges in environmental electroanalysis may be seen in (1) development of new voltammetric and amperometric methods using BDD electrodes and their validation so that they can be routinely used in environmental, biochemical, and other laboratories (2) search on reasonable ways for construction of BDD-based sensors and extension of their applications in environmental analysis and (3) construction of field-deployable analytical devices based on BDD sensors for on-site monitoring of enviromnental pollutants. 

The field to be monitored is usually narrow and long in perimeter security applications. Thus, non-uniform deployment may be necessary. He et al. conclude that the sensor nodes generate false alarms at a non-negligible rate [18], and an exponentially weighted moving average on the sensor node is sufficient to eliminate transient alarms. 

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