Biosignalsplux SENSPRO-EOG Manual de usuario

biosignal acquisition tool-kit for advanced research applications

Electrooculography (EOG) Sensor User Manual

Electrooculography (EOG)

User Manual

PLUX –Wireless Biosignals, S.A.

Av. 5 de Outubro, n. 70 –8.

1050-059 Lisbon, Portugal

[email protected]

http://biosignalsplux.com/

This information is provided "as is," and we make no express or implied warranties whatsoever with respect to functionality, operability, use, fitness for a

particular purpose, or infringement of rights. We expressly disclaim any liability whatsoever for any direct, indirect, consequential, incidental or special

damages, including, without limitation, lost revenues, lost profits, losses resulting from business interruption or loss of data, regardless of the form of action or

legal theory under which the liability may be asserted, even if advised of the possibility of such damages.

ATTENTION

Please read this datasheet before

using your biosignalsplux sensor

The information contained in this document has been carefully checked and were made every effort

to ensure its quality. PLUX reserves the right to make changes and improvements to this manual and

products referenced at any time without notice.

The word Bluetooth and its logo are trademarks of Bluetooth SIG Inc. and any use of such marks is

under license. Other trademarks are the property of their respective own.

Please check your systems and sensors after receiving and before using it the first time to confirm if it

contains all the ordered sensors, accessories and other components. Contact our support via e-mail at

[email protected] if there are any variations from your original order.

For regulatory information, please see the Regulatory Disclaimer at the end of this document.

Electrooculography (EOG) 
User Manual 
 
 
 
of 17 
 TABLE OF CONTENTS 
General Information............................................................................................................. 4 
1. General Description ........................................................................................................... 4 
2. Typical Unfiltered Sensor Output........................................................................................ 4 
3. Sensor Specifications ......................................................................................................... 5 
4. Features ............................................................................................................................ 5 
5. Applications....................................................................................................................... 5 
6. Transfer Function (Conversion Formula)............................................................................. 5 
7. Electrode Connections & Sleeve Color Meanings................................................................. 6 
8. Physical Characteristics...................................................................................................... 6 
Application Notes..................................................................................................................... 7 
1. Reference Electrode........................................................................................................... 7 
2. Vertical Electrode Setup..................................................................................................... 8 
3. Horizontal Electrode Setup................................................................................................. 8 
Using the Electrooculography (EOG) Sensor with biosignalsplux & OpenSignals ......................... 9 
1. Connecting the sensor to biosignalsplux Systems................................................................ 9 
1.1. biosignalsplux 4-Channel Hubs............................................................................................. 9 
1.2. biosignalsplux 8-Channel Hubs............................................................................................. 9 
1.3. biosignalsplux Solo & Single-Channel openBAN Devices ................................................... 10 
2. Configuring the Sensor in OpenSignals.............................................................................. 10 
2.1. OpenSignals (r)evolution (Windows, macOS, Linux) .......................................................... 10 
Safety & Maintenance ............................................................................................................ 13 
1. Safety Instructions........................................................................................................... 13 
2. Transportation and Storage.............................................................................................. 14 
3. Cleaning .......................................................................................................................... 14 
Ordering Guides, Regulatory & Legal Information.................................................................... 15 
1. Ordering Guide................................................................................................................ 15 
2. Guarantee of Quality & Warranty..................................................................................... 15 
3. Warranty Voidance.......................................................................................................... 15 
4. Contact & Support ........................................................................................................... 15 
5. Regulatory Disclaimer...................................................................................................... 16 
 

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1. General Information

1.1. General Description

The biosignalsplux Electrooculography (EOG) sensor has been specially designed for seamless EOG

data acquisition. Either used by itself or in combination with an eye tracker, our sensor can provide

additional insight into your subjects’ eye gaze patterns. The bipolar configuration, with two

measurement electrodes, detects the electrical potentials in the specific temporal or facial region of

choice, with respect to a reference electrode (placed in an area of low bioelectrical activity). The

resulting signal is the amplified difference between these two leads, eliminating the common

unwanted signals. Its convenient form factor enables a discrete application in the typical EOG

electrode placement locations.

Figure 1: biosignalsplux EOG sensor (standard version)

1.2. Typical Unfiltered Sensor Output

Figure 2 shows a typical unfiltered Electrooculography sensor output acquired while blinking. The raw

digital sensor values received from the biosignalsplux device ranged between 0 and 2n-1 (n=sampling

resolution) were converted into the original unit of measurement of this sensor (mV) using the transfer

function found in section Transfer Function (Conversion Formula).

Figure 2: Typical unfiltered sensor output (while blinking and the sensors positioned above and below the eye).

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1.3. Sensor Specifications

> Gain:

2040

> Range:

±0.81mV (with VCC = 3.3V)

> Bandwidth:

0.05-41Hz

> Consumption:

~3mA

> Input Impedance:

> 100 G

> CMRR:

100 dB

1.4. Features

>Single-channel sensor

> Unobtrusive & lightweight sensor

>Bipolar differential measurement

> Pre-conditioned analog output

>High signal-to-noise ratio

> Ready-to-use form factor

> Medical-grade raw data output

> Small form factor

> Raw data output

> Easy-to-use

1.5. Applications

> Life sciences studies

> Biomedical device prototyping

> Human-Computer Interaction

>Eye gaze analysis

> Neurofeedback

> Biofeedback

> Sleep studies

> Neurophysiology studies

> Psychophysiology

> Biomedical device prototyping

> Biomedical research

1.6. Transfer Function (Conversion Formula)

The analog sensor signals acquired with biosignalsplux devices are converted into digital values ranged

between 0 and 2n-1 (n=sampling resolution, usually 8-bit or 16-bit) and streamed in the raw digital

format.

In most applications, the original physical unit of the acquired EOG signal is preferred or required. The

raw digital sensor samples can be converted back into millivolt (mV) using the following formulas:

󰇛󰇜󰇡



󰇢  



(1)

󰇛󰇜 󰇛󰇜  

(2)

Valid sensor range: [-1.5mV, 1.5mV]

with: 󰇛󰇜EOG signal in V

󰇛󰇜EOG signal in mV

 Value samples from the sensor/channel (digital value)

Sampling resolution (default: 16-bit resolution (n=16), although 12-bit and

8-bit may also be found)

 Operating voltage (3V when used with biosignalsplux)

 Sensor gain (2040)

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1.7. Electrode Connections & Sleeve Color Meanings

Sleeve Color

Red

Black

White

Electrode Cable

Reference

See section 2 for more information on where to place the electrodes and to connect electrodes cables

for EOG acquisitions.

1.8. Physical Characteristics

> W1 x L1 x H1:

1.0cm x 1.8cm x 0.4cm

> W2 x L2 x H2:

1.5cm x 2.3cm x 0.4cm

> A1:

105.0±0.5cm

> A2:

28.0±0.5cm

> A3:

8.0±0.5cm

> A4:

28.0±0.5cm

> D:

0.4cm

> Available sleeve colors:

White, Black, Blue, Green, Red, Yellow, Gray, and Brown

Figure 3: Physical characteristics of the standard Electrooculography (EOG) sensor.

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2. Application Notes

The biosignalsplux EOG is designed to be used in, essentially, two configurations that may be

combined. Given its bipolar configuration, the measured signals correspond to the differential

between two electrodes given the reference electrode. The relative positioning of the two electrodes

(positive and negative) allows to infer about the eye movements, specifically, vertical or horizontal

movements.

2.1. Reference Electrode

For the positioning of the reference electrode, it is recommended to be placed in an electrically neutral

spot in the body. For the EOG, it is common to place it as in Figure 4.

Figure 4 - Placement of the reference electrode.

To measure vertical eye movements, the electrodes should be positioned as illustrated in Figure 5. This

positioning allows the measurement of the difference of the potential between the above position and

under position of the eye, thus being indicated to measure the movements in that axis.

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2.2. Vertical Electrode Setup

Figure 5 - Placement of the electrodes to measure vertical eye movements.

For example, if the subject looks up, this will result in a positive peak in the signal, if the subject looks

down, this will lead to a negative peak. This way, the eye movement is aligned with the signal which

allows a more straightforward signal analysis.

The second configuration of the sensor is illustrated in Figure 6. This configuration is suited to measure

horizontal eye movements as it measures the difference between the potential of each side of the

eyes.

2.3. Horizontal Electrode Setup

Figure 6 - Placement of the electrodes to measure horizontal eye movements.

For example, if horizontal eye movement to the left triggers a positive peak, then horizontal eye

movement to the right triggers a negative peak. If we switch the leads, then this behavior will be

switched as well (left is now negative, right now positive).

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3. Using the Electrooculography (EOG) Sensor with biosignalsplux &

OpenSignals

3.1. Connecting the sensor to biosignalsplux Systems

3.1.1. biosignalsplux 4-Channel Hubs

The biosignalsplux EOG sensor is compatible with all 8 analog input channels of the 4-channel

biosignalsplux hub, but incompatible with the reference/ground port. Connect the sensor to an analog

input to use it with this device.

Figure 7: EOG compatible biosignalsplux channels (green checkmarks).

3.1.2. biosignalsplux 8-Channel Hubs

The biosignalsplux EOG sensor is compatible with all 8 analog input channels of the 8-channel

biosignalsplux hub, but incompatible with the reference/ground and digital I/O ports. Connect the

sensor to an analog input to use it with this device.

Figure 8: EOG compatible biosignalsplux channels (green checkmarks).

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3.1.3. biosignalsplux Solo & Single-Channel openBAN Devices

The biosignalsplux EOG sensor is compatible with the analog input channel of the biosignalsplux Solo

(openBAN) device. Connect the sensor to the analog input channel to use it with this device.

Figure 9: Connect the EOG to the analog input channel of the biosignalsplux Solo (openBAN).

3.2. Configuring the Sensor in OpenSignals

3.2.1. OpenSignals (r)evolution (Windows, macOS, Linux)

Open the OpenSignals (r)evolution device manager to access and configure your biosignalsplux device.

Figure 10: Access the OpenSignals (r)evolution device manager.

Select the device you intend to use for acquisition by clicking on ENABLE button on the device panel in

the OpenSignals device manager. The device is activated for acquisition if the ENABLE button is blue.

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