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The Instrument Development Group has successfully developed, built, and calibrated approximately fifty high precision ozone radiometers for the Targeted Wind Sensing Project. This instrument has been involved in many experiments deployed on mobile, semi-autonomous platforms such as balloons and blimps. Additionally, this instrument has been placed within remote system on road sides in New Hampshire and on the Mount Washington auto road. Future work on this instrument includes improving its reliability and measurement accuracy.  Figure 4 - Ozone Instruments
We are working on two fronts with this instrument. In the first case, eleven Ultraviolet Ozone Instruments have been built and installed along New Hampshire highways as part of the New Hampshire Department of Transportation’s roadside weather information system. Secondly, two instruments have been built and installed for the Mt. Washington Auto road with up to eight more to be installed in the next two years. Future Work
This instrument was originally developed almost exclusively for the NOAA smart balloon. The physical size, mounting, power distribution, and board layout were determined from the original mission specifications. Since then, the instrument has been used in several applications where those original specifications were not ideal.
Mostly, newer applications fall into two general categories: One, more traditional applications where size and weight is not critical, such as the RWIS; Two, the original extremely light weight, low power semi-autonomous applications. Due to these two rather different applications, it has been determined to refine the instrument into two separate platforms with the core measurement technology on both.
The first instrument will be redesigned for the more traditional applications and will be more feature rich. It will include USB connectivity, SD card for data storage and possible an LCD. It will be a little larger to match the standard market enclosures. The second will be redesigned with an emphasis on size and weight. A new, shorter sample chamber with an effective length of two inches will be incorporated.
One of the main obstacles to overcome has been varying power supply voltages. For example, the Smart Balloon provides a 3.2 to 5.0 voltage from a lithium-ion battery while the RWIS provides a 10.8 to 13.5 voltage from a lead-acid battery. This has required the IDG to design custom workarounds that are inherently inefficient. In the future we plan to make the power supply input a separate module that will be added on depending on the application. Additional future work for this instrument includes improvement of the ultraviolet lamp circuit, improved robustness, and measurement accuracy.
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