1 Grenzebach Glier & Associates, Inc. Preliminary Design Review Multispectral Camera Advisor: Prof. Mario Parente Team Parente #13 Simon Belkin Audrey C. Finken Matthew Walczak 1

2 Grenzebach Glier & Associates, Inc. Team Parente 2 Matthew Walczak -EE -Website Master Simon Belkin -EE -Team Manager Audrey Finken - EE

3 Grenzebach Glier & Associates, Inc. Outline  The Problem  Background  Our solution  Application  Requirements  Design alternative  Timeline/MDR Goals 3

4 Grenzebach Glier & Associates, Inc. The Problem  Normal camera just take pictures with RGB color filter that show light at three different wavelengths. 4

5 Grenzebach Glier & Associates, Inc. The Problem: 5  We want to expand the capabilities of normal cameras by covering a wider spectrum of colors through the use of a Multispectral dddddddd Camera.

6 Grenzebach Glier & Associates, Inc. Background The Camera will be operated by a microcontroller system that will position a filter in front of a monochrome camera and an image will be captured 6

7 Grenzebach Glier & Associates, Inc. Multispectral camera: background Images taken through different optical filter contain only certain wavelengths of the electromagnetic spectrum that the filter allows through. 7

8 Grenzebach Glier & Associates, Inc. Solution: Multispectral Camera  Create picture at different wavelengths that regular vision does not allow(Near Infrared).  Have various applications not accessible by regular cameras.  The provide more information to user. 8

9 Grenzebach Glier & Associates, Inc. Block Diagram 9

10 Grenzebach Glier & Associates, Inc. Applications Food processingAgriculture 10 Defects such as bruising on fruit are more easily isolated in an infrared image. By studying changes in reflectivity, growers can identify plant stress resulting from problems such as water shortage, nutrient deficiencies, or toxins long before there is any visible indication.

11 Grenzebach Glier & Associates, Inc. Requirement Analysis : specifications  Electronically control the filter wheel and monochrome camera attached to it.  Battery powered  Enclosing case big enough to hold monochromatic camera. 11

12 Grenzebach Glier & Associates, Inc. Filter Wheel  This consist of six or more optical band pass filters.  Filter are mounted in a computer controlled filter wheel located between lens and gray level sensor. 12  Calibration of color wheel turning to be able to have a particular step size.

13 Grenzebach Glier & Associates, Inc. Filter Wheel Challenge: Electronic part  Connection of the filter − Use logic analyzer − Use schematic of filter to figure out pins 13

14 Grenzebach Glier & Associates, Inc. Monochromatic camera  Choosing the Monochromatic camera  Photographs images through the filter wheel in particular frequency spectrum.  Camera settings − Frame rate, latency, exposure, aperture and gain  Enclosed area to prevent light between the Wheel and camera. 14

15 Grenzebach Glier & Associates, Inc. Monochromatic camera challenge :optics 15  Aberration: − Geometric: Each filter is tilted with respect to axis can cause distortion. − Chromatic : When different wavelengths of light aren't focused on same plane. − Ghosting: Images produce reflections between the image sensor and filter surface.  Can be solved via software − Minimize aberration with proper choice of lens and optics

16 Grenzebach Glier & Associates, Inc. Microcontroller circuit  Controls the filter wheel’s turning.  Will collect different image spectrums  Include a display mode − Raspberry pi (tentative)  Microcontroller development board − Arduino board or chip 16

17 Grenzebach Glier & Associates, Inc. Mechanical assembly  Having all the parts fit together − Filter − Optics (lens, camera) − Microcontroller 17

18 Grenzebach Glier & Associates, Inc. Design alternative: CCD  Using a CCD behind the filter wheel:  Advantages: − More sensitive to a broad range of wavelengths  Disadvantages: − Alignment − Have to deal with optical distortion. 18

19 Grenzebach Glier & Associates, Inc. MDR Deliverables 19 IDTask NameStartFinishDurationOct-12Nov-12Dec-12Jan-13Feb-13Mar-13Apr-13May-13 1PDR10/5/201210/15/ days 2MDR10/15/201212/6/ days 3Mid report11/8/201212/10/ days 4CDR12/6/20122/28/ days 5FPR2/28/20134/12/ days 6SDP Day2/10/20134/19/ days 7Final Report1/22/20135/1/ days 8Research Filter Wheel10/8/201210/31/ days 9Access Filter Wheel with Microcontroller11/1/201212/5/ days 10Research Extra Rotating Filter Wheels10/12/201211/1/ days 11Obtain Rotating Filter Wheels11/1/201211/25/ days 12Research Filter Camera Lens10/8/201211/1/ days 13Obtain Camera Lens11/1/201211/20/ days 14Research Monocromatic Camera/CCD10/5/201211/1/ days 15Obtain Monocromatic Camera/CDD11/1/201211/20/ days 16Access Monocromatic Camera with Microcontroller11/20/201212/6/ days 17Research Microcontroler10/10/201211/15/ days 18Software adjusting for aberations of One Color11/15/20121/22/ days 19Software adjusting for aberations of Two Colors12/6/20122/28/ days 20Software adjusting for aberations of All Colors available in Filter Wheel12/6/20134/12/ days

20 Grenzebach Glier & Associates, Inc. Thank you for your Time! – Questions? 20