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Roth, L. O.

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https://ntrs.nasa.gov/search.jsp?R=19790014412 2020-03-21T23:44:23+00:00Z
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QUARTERLY PROGRESS REPORT
	
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1. Portable Sampling Bins and Trailer Transport System.
Bin brackets to support the continuous sample film holder and recorder moduli
have been made and installed on the sample bin frame. This unit, along with
the fluorometer equipped with the strip scan door, is now ready for field
evaluation when weather conditions permit.
IMPROVED PRECISION IN AERIAL APPLICATION EQUIPMEhTI'
CONTINUATION OF NASA RESEARCH GRANT: NSG 6018
OKLAHOMA AGRICULTURAL EXPERIMENT STATION PROJECT: 3133-G1264
Lawrence 0. Roth, Principal Investigator
Agricultural Engineering Department
Oklahwna State University
Stillwater, OK 74074
(405) 624-5432
PROJECT ACTIVITIES
A calculator program has been developed and validated for the electronic weighing
and calculating system to record sample weight data, to calculate and print c-it
swath .statistics and to record individual run swath data on magnetic card for
further analysis. Also, an electronic control system for the strip chart
recorder has been developed (but not yet installed in the calculator/electronic
balance interface unit) to cause the strip chart recorder, when a sample is
weighed and entered into the calculator, to draw a line proportional to the
sample weight, then advance automatically to await the next sample entry. Thus,
when the Last sample from a test run has been weighed, a graphic display of the
swath from this strip chart recorder will be immediately available for inspection
along with swath statistics from the calculator. A set of bin sample data
(24 samples) can be weighed and analyzed in approximately 5 minutes by one man.
2. Portable Liquid Dispersal System to Simulate Aerial Application.
System is complete and ready for field use when weather conditions permit.
3. Rapid Spray Analysis Technique.
To further evaluate the effect of sample card size, a series of different mylar
sample card sizes (nominally 100, 50, 25, 12.5 and 6.25 cm 2) were sprayed with
a msgznetostrictive atomizing device featuring a single 0.]m orifice to create
uniform drops and an electrostatic drop stream dispersal system to simulate
applica—Lon rates of 10'1/ha (1GPA) or less. An analysis of the data shows that
essentially the same application rates were measured from the different sizes of
sample -ards. However, as expected, the smaller card sizes resulted in a greater
variation in the range of measured values, thus necessitating relatively more
smaller samples to be taken and analyzed to accurately represent a particular
application rate. .Based on these results, it appears that the 35m film will
provide a satisfactory sampling area, if adequate numbers of samples are taken.
The samples for these studies were analyzed in the instrumentation van at the
rate of about 2.5 samples per minute.
An analog to B® converter and recorder control module (similar to the unit
developed for the weighing system) is under development for use with the fluoro-
meter to simultaneously produce a graphic display of a swath (from the strip
chart recorder) and to enable entering swath sample data directly from the
fluorometer into the programmable calculator for generating swath statistics
immediately following the processing of the last sample from a trial run.
Fabrication and installation of the continuous strip scan door for the fluorometer
is complete. The assembly has been mounted at one end of the sample bjn ; with a
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35mn film reel at the opposite end of the bins. This equipment will enable
treatment and subsequent analysis of a continuous 24 meter strip of film
placed across the swath. Studies are planned to compare the relative fluoro-
meter readings obtained from passing the continuous strip through the strip
scan door (where the fluorometer sees the fluorescence from the dried drop
drop pattern) with the fluorometer readings when samples are cut from the film
and subjected to a washed sample analysis.
4. Aircraft Position Measurement.
No activity during quarter.


Improved precision in aerial application equipment

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