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KGCOE MSD Detailed Design Review

P13481 Underwater Leak Detector

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

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 MSD of 22 Technical Review Agenda

A colleague came to a student for advice on ways to locate leaks in pools. After suggesting currently used above water technology for pool leak detection, it was discovered by the colleague that a hand held unit was needed. After attempting to find a unit that could satisfy his needs it was realized that nothing like it exists, especially on a consumer-affordable level. The student sought an opportunity to develop a similar technology for the detection of above ground pool leaks built for the average consumer. This is a blank slate project.

Project Background

Problem StatementThe primary objective of this project is to design and develop a underwater handheld leak detector that is affordable to the general above ground pool owner. The leak detector should capture acoustic energy produced by an underwater leak and visually indicate to user the unit location in proximity to the leak.

Objectives/Scope1. Create a low-cost and easy to use leak detector2. Detector must have a range of detection to within a foot

Deliverables

● A working hand held underwater prototype unit● Methodology and hardware to test leak detection system. The system will include

most of the common types of leaks in an above ground pool.● A design proposal for a cost-effective , user friendly production design.● A concise documentation package of development and design activities, test

methods and results, shortfalls, and proposed next steps.

Expected Project Benefits● Functional handheld underwater leak detector (MSDII)● New Design, Drawings, Sketches● Well documented acoustic energy produced by various size leaks.● Attachment to pool pole (MSDII)

User NeedsNeed Priori

ty Nominal Value Ideal Value Corresponding Spec

Detects leak within specified distance 1 1 ft. 2 ft. 1, 11, 12, 13Operates under

user “conditions” 1 2 ft. visibility 4 ft. visibility 7, 9, 10Gives visual

representation of distance to leak

2 LED indicator LED indicator 10

Portable 2 5 lbs 2 lbs 5, 6Easy to Train/Use 2 Training Time < 1

hr.Training Time < 30

min1, 2, 5, 6, 7,

9, 10Operates 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, 7Indicates if power is

on 2 LED Indicator LED Indicator 10

KGCOE MSD of 22 Technical Review

Engineering SpecificationsEngr. Spec

. #Importance Specification (description) Unit of

Measure Marginal Value Ideal Value

1 1 Radius of Detection Feet 1 foot 2 feet2 1 Battery life Hours 1 Hr 3 Hrs3 2 Battery type Voltage 2-9 Volt 1-9 Volt4 2 Operating Temperature Degrees 50-100 F 32-100 F5 2 Weight Pounds 3 lbs 2 lbs6 3 Dimensions Inches 12"x4"x6" 10"x4"x2"7 1 Waterproof up to Feet 6 Feet 10 Feet8 1 Hole size detection range Inches >.25 in >.1in9 2 Buoyancy Newtons 0 N -.5 N

10 2 LED Brightness mcd 100 mcd 120 mcdHydrophone Specs

11 2 Directional Characteristics direction Omnidirectional Unidirectional

12 1 Frequency Range Hz 90-1300 Hz No13 1 Sensitivity dB -60 dB No


Assumptions and Constraints

1. Using a pre-made hydrophone, will increase the cost of our overall system. However, there is an assumption that a large order of hydrophones for a “mass-production” of leak detectors would result in a discounted price per hydrophone, therefore resulting in a lower final system cost than our prototype cost. In MSDII we will try and create our own “low cost” hydrophone.

2. We are assuming that the material which has a leak is vinyl.3. Project budget not to exceed $10004. Measurements will be taken at rest. (Holding breath, not moving unit/moving very slow)5. Leaks are influenced by top to bottom location in pool; leaks near the top are harder to

detect due to lower hydrostatic pressure.6. Users of system will be able to differentiate noise and real leak signal.7. We are assuming an above ground circular pool, depth of 5 feet.

Functional Decomposition

Pugh Diagra

m Concepts

Criteria Leaktronics

Sound Detector

Current Detector

Pressure Sensor

Camera Detector

Cost

Datum

+ + + -Portabilit

y + - - +Hand-Held + - + -

Waterproof + s s s

Ease of Use + s s -

Range s + - -User

Safety + s s sChemical Interactio

n+ s s s

Power Consump

tion+ + + +

Sum of "+" 8 3 3 2

Sum of "-" 0 2 2 4

Sum of "s" 1 4 4 3


Block Diagram

Risk Prevention Plan

Mitigation Plan

Severity

Likelihood

Importance


Risk Assessment

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 – First Round of Testing

Filtered and unfiltered sample from half inch hole, 8 inches away


Filtered and unfiltered sample from half inch hole, one inch away

Test Results – First Round of Testing

Test Results – Second Round of Testing


Leak noise sample mean amplitude versus distance


Filtered and unfiltered sample from half inch hole 1 – 6 ft away

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

Battery Type Qty Voltage Amp- Hours Estimated Current (mA) Estimated Battery Life (Hours)9V Alkaline 1 9 0.565 0.751 0.75


Chosen IC Specs

Preamp Circuit


Circuit Design

Filter Circuit


Circuit Design

LED Circuit


Circuit Design


Concept Development


CAD Design

Part Name Manufacturer Manufacturer Part #

Quantity Needed Ordered Unit Price Total Price Lead Time Owner Status Comments

Elec

tric

al

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.

Hou

sing

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

Test

ing

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 $423.26Legend Received Ready to order Not Ready


Bill Of Materials

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