P13481underwater Leak Detector

P13481Underwater Leak Detector

Team Members:Brendan Harder, Gabe Nicasio, Pete Goebel, Matt Strickler, JoeMalanga

Meeting Purpose: A detailed review of the Underwater Leak Detector

Materials Reviewed:

Project Background

Updated Customer Needs, Engineering Specs

Pugh Diagram

Risk Assessment matrix

Feasibility Testing

Circuitry

Leak Detector CAD Design

Bill of Materials

Attendees

Dr. Jim Moon - EE

Professor Ed Hanzlik– ME

Les More- ME

Meeting Time and Location:

Friday November 2nd 2012

Time: 10 am- 12 pm

Room 09-2130

KGCOE MSDPage 1 of 22Technical Review Agenda

KGCOE MSD Technical Review Agenda

KGCOE MSDPage 1 of 22Technical Review Agenda

User Needs
Need / Priority / Nominal Value / Ideal Value / Corresponding Spec
Detects leak within specified distance / 1 / 1 ft. / 2 ft. / 1, 11, 12, 13
Operates under user “conditions” / 1 / 2 ft. visibility / 4 ft. visibility / 7, 9, 10
Gives visual representation of distance to leak / 2 / LED indicator / LED indicator / 10
Portable / 2 / 5 lbs / 2 lbs / 5, 6
Easy to Train/Use / 2 / Training Time < 1 hr. / Training Time < 30 min / 1, 2, 5, 6, 7, 9, 10
Operates for entire dive without recharging / 1 / 1 hour / 3 hours / 2, 3
Battery is easy to replace / 2 / Time < 10 min / Time < 5 min / 3
Does not impede diver / 1 / 25 meter swim with unit is <125% of time without unit / 25 meter swim with unit is <110% of time without unit / 5, 6, 9
Parts cost less than $100 (mass production) / 1 / $100 / $80 / 3, 11, 12, 13
Can be used in halogen (chlorine, bromine) with minimal damage / 2 / Housing does not noticeably degrade over a 24 hour period being left in chlorinated pool. / Housing does not noticeably degrade over a 48 hour period being left in chlorinated pool. / 4, 7, 9
Does not damage pool / 1 / Rounded Edges / Soft Touch Rounded edges / 5, 6, 7
Indicates if power is on / 2 / LED Indicator / LED Indicator / 10
Engineering Specifications
Engr. Spec. # / Importance / Specification (description) / Unit of Measure / Marginal Value / Ideal Value
1 / 1 / Radius of Detection / Feet / 1 foot / 2 feet
2 / 1 / Battery life / Hours / 1 Hr / 3 Hrs
3 / 2 / Battery type / Voltage / 2-9 Volt / 1-9 Volt
4 / 2 / Operating Temperature / Degrees / 50-100 F / 32-100 F
5 / 2 / Weight / Pounds / 3 lbs / 2 lbs
6 / 3 / Dimensions / Inches / 12"x4"x6" / 10"x4"x2"
7 / 1 / Waterproof up to / Feet / 6 Feet / 10 Feet
8 / 1 / Hole size detection range / Inches / >.25 in / >.1in
9 / 2 / Buoyancy / Newtons / 0 N / -.5 N
10 / 2 / LED Brightness / mcd / 100 mcd / 120 mcd
Hydrophone Specs
11 / 2 / Directional Characteristics / direction / Omnidirectional / Unidirectional
12 / 1 / Frequency Range / Hz / 90-1300 Hz / No
13 / 1 / Sensitivity / dB / -60 dB / No

Pugh Diagram / Concepts
Criteria / Leaktronics / Sound Detector / Current Detector / Pressure Sensor / Camera Detector
Cost / Datum / + / + / + / -
Portability / + / - / - / +
Hand-Held / + / - / + / -
Waterproof / + / s / s / s
Ease of Use / + / s / s / -
Range / s / + / - / -
User Safety / + / s / s / s
Chemical Interaction / + / s / s / s
Power Consumption / + / + / + / +
Sum of "+" / 8 / 3 / 3 / 2
Sum of "-" / 0 / 2 / 2 / 4
Sum of "s" / 1 / 4 / 4 / 3

Risk / Prevention Plan / Mitigation Plan / Severity / Likelihood / Importance
Varying Frequency Bands / Varying filter settings / Potentiometer and sensitivity dial / 3 / 3 / 9
Waterproofing / Silicone Ring Seal / Silicone Ring w/ Silicone Caulk / 3 / 2 / 6
Scuba gear resonating with hole frequency / Holding breath while taking readings / Cancel Scuba Noise by “playing back” canceling signal. / 2 / 2 / 4
Shockproofing / Use rubber circuit Mounts / Use rubbery casing and rubber circuit mounts / 2 / 1 / 2
Battery Life / Use 2 C batteries / Use 2 D batteries / 1 / 1 / 1

Test Results – SecondRound of Testing

Preamp - NXP Semiconductors TDA1517P/N3,112

Preamp
2 x 20 dB 6W (max) amplifiers
6V – 18V supply voltage, ~650 mA worst case

Texas Instruments LMV771 Op Amp

Amplifier/Filter
100 dB max gain
5.5V max supply voltage, ~1mA worst case

Texas Instruments LM3914 LED Driver

Comparator with 10 LED outputs
Floating 10-step divider
6.8 V – 18V supply voltage, ~ 10 mA per LED

Preamp Circuit

Filter Circuit

LED Circuit

KGCOE MSDPage 1 of 22Technical Review

Part Name / Manufacturer / Manufacturer Part # / Quantity Needed / Ordered / Unit Price / Total Price / Lead Time / Owner / Status / Comments
Electrical / LMV771MGCT-ND / National Semiconductor / LPV511MG-NOPB / 5 / 10 / $1.46 / $14.60 / 1 Week / Matt/Joe / Received / Op-Amp
LPV511MGCT-ND / National Semiconductor / LPV511MGCT-NOPB / 5 / 10 / $1.46 / $14.60 / 1 Week / Matt/Joe / Received / Op-Amp
DE2SRD / Kingbright / DE2SRD / 5 / 10 / $0.79 / $7.90 / 1 Week / Matt/Joe / Received / LEDs
568-1128-5-ND / NXP Semiconductors / TDA1517/N3,112 / 1 / 10 / $1.32 / $13.20 / 1 Week / Matt/Joe / Received / Preamp IC
LM3914N / Texas Instuments / LM3914N-1/NOPB-ND / 1 / 5 / $2.15 / $10.75 / 1 Week / Matt/Joe / Received / IC LED Driver
Printed Circuit Board / Matt S.
Batteries / Joe M.
Housing / Prototype Housing / - / - / 5 / - / $1.00 / $5.00 / 2 days / Gabe N. / 1 Done
Foam / - / - / 5 Blocks / 5 / $5.00 / $25.00 / - / Gabe N. / 1 Done
Bondo / 1 / 1 / $8.00 / $8.00 / Brendan H. / Received
Testing
Hydrophone / Aquarian Audio / H1c / 1 / 1 / $129.00 / $129.00 / 1 Week / Brendan H. / Received
Cable Termination / Aquarian Audio / TERM / 1 / 1 / $5.00 / $5.00 / 1 Week / Brendan H. / Received
Cable / Aquarian Audio / CA-40 / 3 / 3 / $3.50 / $10.50 / 1 Week / Brendan H. / Received
1/4" TRS-Male / Aquarian Audio / NYS224BG / 1 / 1 / $2.50 / $2.50 / 1 Week / Brendan H. / Received
Shipping / - / - / 1 / 1 / $7.22 / $7.22 / 1 Week / Brendan H.
Pre-Amp / - / - / 1 / - / $0.00 / $0.00 / - / Pete G.
GoPro HD / GoPro / - / 1 / - / $0.00 / $0.00 / - / Brendan H. / Borrowed
Underwater Lens / GoPro / - / 2 / - / $50.00 / $50.00 / 3 days / Brendan H.
Pool / - / - / 1 / - / $0.00 / $0.00 / - / Pete G. / Borrowed
Plastic Welding Kit / Harbor Freight / 96712 / 1 / 1 / $69.99 / $69.99 / 1 day / Brendan H.
Red Filter / GoPro / - / 1 / 1 / $50.00 / $50.00 / 1 Week / Brendan H.
Totals / $423.26
Legend / Received / Ready to order / Not Ready

KGCOE MSDPage 1 of 22Technical Review