nov16thmeeting SIDS Monitor Team Meeting #10 10-16-06 I. Team member Reports A. Inductor Strap
1. Two coils were wired into either side of the strap and connected in series.
- Stretching the strap produced less change in inductance than when only
using one coil. 2. A strap prototype was designed and built using only one coil.
- Made to fit an adult test subject.
- Made of two nylon straps connected by a length of pantyhose material.
- 32 AWG wire was coiled around the pantyhose and sewn in every 3 loops
as an anchor.
- For a full 2-3 inch stretch, the change in inductance was measured as 3
micro henrys.
B. Materials and Testing
- For making the casing of the final prototype, look into injection
molding.
- We have been given permission to use a "breathing" infant doll
from the pediatric center here in town.
- The textile department has agreed to work with us and sew our
prototypes for free.  Also, a sewing machine was used in
attempt to sew 32 AWG wire into fabric. So far it doesn't work
very well. Elaine from the textile department is currently working
on the problem.
- The stress model for the wire is near completion but requires data
on the inward force applied by a given elastic band. C. Oscillator Circuit
- Currently operating at 1.22 MHz (Using the inductor strap from
A.2. as the tank inductor.)
- A full stretch of the inductor band produces a 10.77% increase in
frequency.
- Oscillation remains stable over changes in tank inductance.
- The circuit currently requires 3 milli amps from the power source.
II. Snapshot Day, December 1st
A. We will reconvine Tuesday November 28th to finalize our presentation.
III. Action Items
A. Conduct test for force of elastic. - Bart
B. Write up intermediate design report. - Jen and Jeff
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