Aquatic Spectrometer & Turbidity Meter Preliminary Design Review ECE 4007 L1, Group 8 Paul Johnson Daniel Lundy John Reese Asad Hashim.

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Presentation transcript:

Aquatic Spectrometer & Turbidity Meter Preliminary Design Review ECE 4007 L1, Group 8 Paul Johnson Daniel Lundy John Reese Asad Hashim

Introduction & Background  What is it? A device to detect the colour and clarity of a uniform flowing water sample  How will it work? LED’s, a diffraction grating, a photodetector array and an on-board PC  Why do we need it? Demand from Aqua-culturists and Water Regulation Authorities for a cheap and easy to use device

High Level Block Diagram

Electronic Specifications  LED’s (Luxeon LXHL-NWG8) Switched on/off via control signal, through 350mA Continuous Power Supply  CMOS Sensor (Kodak KAC-9630) Triggered to capture via control signal through serial interface  Power Considerations

Electronic Block Diagram

Optics - Prism  Higher cost  Larger area required Source:

Optics – Diffraction Grating  Inexpensive  Easily positioned  500 grooves/mm  Resolution of 0.633nm Source:

Optics – Physical Placement  Requires fine sensor adjustment  +/-0.1mm tolerance for 1 st order maxima  Active sensor area is the limiting factor

Mechanical Hardware  Secure the optical and electronic components to the enclosure  Facilitate and ease the alignment process  Keep the system calibrated, mechanically, as long as possible

Two Slits Assembly

CMOS Sensor Assembly

Base Support Plate  Slotted holes provide movement and alignment adjustment for the distance between the diffraction grating and CMOS sensor  Mates to the Vertical Support Plate

Vertical Support Plate  Three Point Precision Mount (Springs and Screws)  Middle screw hole utilizes negative pressure via lock down screw to secure position  Provides minute adjustments in the horizontal direction  Mates to both the Base Support Plate and CMOS Mount Plate

CMOS Mount Plate  Attaches the CMOS Sensor to the plate via standoffs  Provides the vertical alignment adjustment

Single Board Computer  TS-7250 ARM9 Single Board Computer 200 MHz 32 MB RAM  Programming in C  Four source files: SpecMain.c SquareWave.c Process.c Networking.c  Compiling with ARM9 compiler obtained from vendor  Networking software with wireless networking capabilities Source:

Software Flow Chart

Photo Sensor Interfacing  Sensor will be clocked at 10 MHz  A 1 byte intensity value corresponds to each pixel on the sensor  A serial image consists of a data out pin d[0] and three synchronization pins: d[1],vsync, and hsync Source: Kodak KAC-9630 data sheet

Normalizing the Spectrum  The white light spectral response of the sensor is not perfectly flat  Other factors such as LED spectral output also add distortion to white light response Source: Kodak KAC-9630 data sheet  These inconsistencies are accounted for by performing spectral analysis with no sample present and multiplying the measured response of samples by the inverse of the white light response

Color Analysis - Obtaining Spectrum Values  Intensity values are stored in a vector  Vector is divided into 3 (or more) regions  Total intensity of each region is calculated  The resulting regional intensities are compared to each other and stored as ratios  Ratios are compared to predetermined ratios from known algae samples to determine the algae's growth stage

Spectrum Division Visual representation of spectral division

Turbidity Analysis  Regional intensities from color analysis are summed to create an overall intensity  The weaker the overall spectral intensity, the greater the turbidity  Intensity to turbidly conversion will be calibrated by finding the spectral intensities of various samples of water with known turbidities

Cost Analysis PartCost LEDs$9 SBC$184 CMOS Image Sensor$14 Optics Kit$10 Power Supply$20 Misc. Hardware$120 Total$357

Conclusions  Electronics Schematics drawn, parts en route, prototyping in progress  Optics Parts en route, calculation & experimentation stage  Mechanical Mechanical drawings done, in fabrication stage.  Software SBC delivered, preprogramming stage

Questions?