sensor on glasses
DESCRIPTION
Sensor on glasses. Characterization Presentation Part 1 - Winter 2012. Performed by: Danielle Perez Shuki Eizner Instructor: Alexander Kinko Duration: 2 Semesters. Table Of Contents. Introduction Project’s Goals Project’s Overview (Semester A) - PowerPoint PPT PresentationTRANSCRIPT
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Sensor on glasses
Performed by: Danielle PerezShuki Eizner
Instructor: Alexander Kinko
Duration: 2 Semesters
Characterization Presentation
Part 1 - Winter 2012
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Table Of Contents• Introduction
• Project’s Goals
• Project’s Overview (Semester A)
• Project’s Overview (Semester B)
• Analog waves- Temporary solution
• Project’s Basic Block Diagram
• Suggested eyelid movement Flow Detection
• Project’s Implementation
• Estimated Timeline
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Neuro-ophthalmologists and eyelid surgeons analyze lid motility for
assessing ptosis, third and seventh nerve palsy, myasthenia gravis,
Graves’s disease, and Parinaud’s syndrome. Currently, mainly static
measurements of the lid fissure and levator action (amplitude) are done
routinely.
Many different techniques have been used to measure the time course of
blinks using coils, camera, lever arm and photosensitive position
detector, but no clinical tool is widely available.
Introduction
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Project’s Basic ConceptPatient
Eyelid Movement Sensor Device (EMSD)
Doctor
Results of analysis PC Application(Doctor’s workspace)
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Develop a portable, low-power system that will check the eyelid movements and analyze the results.
The system will check only the eyelid movements without any consideration in the eyeball movement
Project’s Goals
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Goals-functional CharacterizationThe system has the following features:
Portable system Enables better tracking of the blinks by storing data, describing
specific eyelid movement which include:
Starting and ending time (10-15 minutes each test) Velocity Frequency Position
Have the ability to analyze each eye separately.
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Goals-functional Characterization(continuation)
• Creating a unique set of software both for PC and EMSD, which
enables performing of the following tasks: Downloading data from portable device. Operating EMSD in the real-time mode (RT-mode). Performing of the data processing on downloaded data and
displaying the appropriate statistics on PC (Offline-mode). Creating database and storing it for the further inspection by the
doctor.
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Project’s Goals- Technological• Precondition- the ability to create glasses with a sensors that
provides the analogue signal.
Temporary solution- working with synthetic waves.
• Physical dimensions of the EMSD suitable for the glasses handles.
• Recognition of a eyelid movements from a specific range of
frequencies (1Hz-50 Hz).
• Storing of the parameters describing eyelid movement in the non-
volatile on-device memory.
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Project’s Goals- Technological
• Ability to store the parameters for 10 measurements each
measurement takes 10-15 minutes
• The start of each measurement controlled by the patient.
• Ability to synchronize the two identical chips with external time
reference source (pc)
• Low-power rechargeable battery sustainable for an entire day.
• Alert for “low-battery” state.
• Interconnection to PC for performing extended data processing
and better tracking as well as real-time mode.
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Project’s Overview (semester A)
• Choosing components for the project, suitable for low-power
applications.
• Designing the power part of the project (battery recharge and power
management).
• Designing a digital part of the project (MCU, memory, etc.).
• Drawing the schematics and performing layout for the EMSD.
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Project’s Overview (semester A continuation)
• Manufacturing and assembling of the PCB.
• Performing basic debug (includes using low-level software drivers).
In parallel :
• Creating analogue waves that demonstrate the real analogue signal.
• Checking the signals by running simulations
• Semester A destination: having a completed PCB
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Project’s Overview (semester B)
• Full debug of the EMSD’s hardware.
• Designing software for embedded hardware of the EMSD that includes
recognition of the required blinks and storing the basic parameters on
the EMSD’s memory.
• Designing a unique high-level software for PC, that enables
communication with EMSD, creating the database, performing various
graphs and storing the database for further inspection by physician.
• Validation/characterization of the system and performing S.U.T.
(System Under Test) procedure.
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Analog waves- Temporary solution
22
2
( ) ( )2 ( ) 0d Y t dY tg Y tdt dt
2 2
( ) cos( ) sin( )
23
gt gY t Ae t t
g
g
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2( )( ) sin( )gtdY tV t A e tdt
Analog waves- Temporary solution (continuation)
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Waves examples:
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
1f=3Hz
T[sec]
Vel
ocity
[mm
/sec
]
0 0.02 0.04 0.06 0.08 0.1 0.12 0.14 0.16 0.18 0.2-50
-40
-30
-20
-10
0
f=15Hz
T[sec]
Vel
ocity
[mm
/sec
]
0 0.005 0.01 0.015 0.02 0.025 0.03 0.035 0.04 0.045 0.05-100
-80
-60
-40
-20
0
20f=35Hz
T[sec]
Vel
ocity
[mm
/sec
]
0 0.005 0.01 0.015 0.02 0.025 0.03 0.035 0.04 0.045 0.05-140
-120
-100
-80
-60
-40
-20
0
20f=50Hz
T[sec]
Vel
ocity
[mm
/sec
]
5 (2 )6
g f
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Project - scheme
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Project’s Basic Block Diagram
Pre - AMP
Controller
EEPROM
Data
\6
LEDUserControl
User Interface
PC
USB
LEDControl
RTCCMemoryControl
InternalMemory
Eyelid movementDetection
Comm.Control
mux
Micro-SD(optionally)
Coils&magnet
A/D
Power controller DC/DC
Analogue sensor
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Suggested eyelid movement Flow Detection
Start
SampleData
DigitalB.P.F.
Store eyelid movementsparameters
in the EMSD’s memory
PC-analyze data
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Estimated Timeline
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Any Questions...?