P16551: Observer Calibrator
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Detailed Design

Table of Contents

Team Vision for Detailed Design Phase

During this phase, we obtained the materials needed and began prototyping the Observer Calibrator. We tested the LEDs in the lab of the Program of Color Science. There, we measured the individual LED luminance and the LED spectral power.

Prototyping, Engineering Analysis

We have developed a prototype graphical user interface (GUI) in MATLAB's GUI creator, "GUIDE." This GUI uses slider bars to adjust workspace variables. The GUI prototype is displayed below.

GUI Prototype

GUI Prototype

A test to ensure the LEDs could be controlled via PWM was performed for each LED individually. The tests are hosted on YouTube and can be viewed here

Bill of Material (BOM)

An updated chart of all costs, both realized and anticipated, can be viewed below.

Updated Costs for OC

Updated Costs for OC

Our total budget can also be viewed below.

Updated Budget

Updated Budget

These can be found in our updated BOM. The live document can be found here

Test Plans

Our test plan for measuring the luminance of the LEDs was updated. The flowchart for this test is shown below.

Updated Luminance Test

Updated Luminance Test

We also printed a small sample of 3D printing material, to test its ability to adhere to reflective paint. The samples painted are shown below, right after applying paint.

Testing Reflective Paint on 3D Printed Surfaces

Testing Reflective Paint on 3D Printed Surfaces

A link to the Requirements and Testing document, which contains more details on the proposed test plans, is given here.

Tests Performed

A test to ensure the LEDs could be controlled via PWM was performed for each LED individually. The tests are hosted on YouTube and can be viewed here.

We tested each LED, one at a time, to ensure they meet the required spectral output and luminance level from our requirements. A graph of the relative spectral power of each LED is given below.

Relative Spectral Power of LEDs

Relative Spectral Power of LEDs

The peak wavelengths were captured along with the luminance values for each LED, as well. These can be found in the chart below:

Test Data from LED Luminance Tests

Test Data from LED Luminance Tests

From these data, we determined that all LEDs match their target peak wavelengths. From the luminance test, we decided that we may have to add a second bulb for the 190HBB LED, due to its low luminance compared to the other LEDs. All test data is captured in our requirements and testing document, here.

Risk Assessment

Our latest risk assessment can be viewed below. The updated live document can be found [risks.xlsx here]. We are currently on track with all risk mitigation schedules, as of the end of MSDI.

Updated Risk Assessment

Updated Risk Assessment

Design Review Materials

Our presentation slides for the combined Detailed Design Review and Gate Review can be found here

Conclusion of MSDI

We met as a group to critique the group as a whole. We felt the team dynamic was fantastic, and that the team performed well in every phase of the design thus far. Between the different majors and disciplines, we felt we had either the skills necessary or the connections necessary to accomplish all our tasks and goals. The team self-critique can be seen below:

Updated Risk Assessment

Updated Risk Assessment

Plans for next phase

We plan to perform more testing on the integrating sphere material, and begin designing this sphere, during the beginning of MSDII. Over the break, we will brush up on our MATLAB skills, and think about the programming required to implement the researcher user interface to the Observer Calibrator.

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