2/20/2019

Diane, Juan met in RT Lab

To Dos:

• Research interference between sensors (look at noise, accuracy), vibrations (including strength of FG) for first look at distancing
• Map sensor locations
• Look into mapping during nose cone layup (easier with two separate halves)
• Look into location of payload stack in CAD to find where the DAQ interfaces with the thermocouples relative to the base of the nose cone
• Determine wire length for thermocouples to cut, the shorter the wire the more accurate reading (less resistance), reduce mass, reduce load
  • Consider cable management system (looping wire near the DAQ, calibrate for extra resistance)
• Vibe Test
  • Test different locations 
  • Criteria: noise, accuracy
• Consider internal camera for performance for future scientific payloads

2/23/2019:

Diane, Miske, Juan

• First experiment will test 0 degree angle shift between two layers of 3 TC's, X inches apart (to be determined)
• Potential Wiring Strategies:
  • Single continuous loop, across different contours (see diagram A below):
  • 3 lines of TC pairs according to blackboard diagram (see diagram B below):
    
• For first experiment, use the following jig (lasercut) for each layer (apply epoxy first, then use jig)
  • Need diameters for contours on which to apply  TCs
    
• Consider using 3D printed support structures (see below) 
  
  • Concern for strength/adhesion on launch
  • Ideally thin, and epoxied along inner surface of NC
  • Combine jig and ring for mounting (void) and support 
  • 

2/27/2019

Diane, Miske, Juan

Determined first method of thermocouple attachment: steel rod jig w/ aluminum tape or string quick-release knots

Determined distance from base of NC to DAQ-TC interface: height = 3.08", ID = N/A

Determined preliminary strategy for marking points inside the NC:

• Map out discrete nodes, make drawing in CAD to print a sleeve that slides into the nose cone with gridlines to aid eye in marking points

3/3/2019 

Diane, Juan

Attempted preliminary strategy:

• Cutting out the strips of grid paper took quite a while
• Laying them inside the NC also took some time
• Made strips for ideal NC (direct model), test NC was different in shape and size
• Reaching in the NC made pinpoint marking difficult

Result: two thermocouples mounted in the test NC

New strategy idea: shine through NC with lights for guidance

3/4/2019

Juan

New strategy (need 2 people)

Materials Required:

• Scotch tape 
• Light source (very bright, and focused)
• Hole puncher/pen/sharp thing 
• Gridded paper strips 
• Thermocouples
• Thin rods (support the thermocouples)
• Mini C-Clamps (see clamp drawer in lab)
• Aluminum Tape 
• Willpower and patience 

1. Take a strip of tape that is lengthwise X inches (chosen exterior diameter of the NC), and using a pen mark out 3 equally spaced segments (do not cut)
2. Lay the tape strip at a chosen location on the NC.
3. Lay gridded paper strips along the exterior surface of the NC (3, 120 deg apart) by aligning the central lines on the strips with the pen marks on the tape. Use extra tape to secure the gridded strips.
4. Punch holes into points of interest on the gridded strips
5. Use a bright light source (flashlight, super bright LEDs, whatever) to shine a reference point through the NC
6. Have another person mark the point OR skip to 5.
7. Fix thermocouple bead to point of interest and apply Proline 4500 epoxy to cover the bead 

Notes:

• Ideally, one person would hold the light sources steadily on the point of interest, and another lays the thermocouple, clamps it, and applies epoxy