Sch"after+Kirchhoff SK1024U3PD Manuel d'utilisateur télécharger pdf (Page 8)

USB3_ZK.indd • Page 21

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11-2014 E

Shading Correction is used to compensate for

non-uniform illumination, lens vignetting and/

or any differences in pixel sensitivity. The image

from a white homogeneous background is

used as a reference to correct each pixel of the

sensor with an individual factor, scaled up to a

adjustable level. The result is a homogeneous

image over the complete area when a white

object is scanned. The correction profile can

be stored permanently in the Shading

Correction Memory (SCM) of the camera for

immediate use when the camera is reactivated

at the next start.

With color line scan cameras, shading

correction can also be used as a white balance.

The line scan signal of a triple line color

camera with different intensities for R, G, B.

After shading correction, the flat signal

confirms the alignment of RGB intensities,

here scaled to the maximum intensity of the

raw signal.

Cable for external synchronization

Software

SK91USB3-WIN

SkLineScan

Control program

SDK with API und

C++ class library

Order Code

SK91USB3-WIN

Power Supply

PS051515

Order Code

Input: • 100−240 V AC

• 0.8 A

• 50/60 Hz

Connector IEC 320 (3-pin )

Output: • 5 V DC/2.5 A

• 15 V DC/0.5 A

• -15 V DC/0.3 A

Connector Lumberg KV60

(female 6-pin )

LINE SYNC Modes

FreeRun: The next exposure of a line scan is

started automatically on completion of the

previous line scan.

LineStart: The line scan exposed at the time of

the external trigger is read out. The start and

duration of exposure are controlled internally

by the camera. The trigger frequency does not

affect the exposure time.

ExposureStart: A new line exposure is started

exactly at the time of triggering. Programmed

exposure times are unaffected by, although

must be longer than the trigger period.

ExposureActive: The external trigger signal

determines the start and end of exposure,

which is defined by the trigger period.

SyncDivider: The external trigger frequency is

divided by a programmed integer. Only every

n-th line is recorded.

FRAME SYNC

Additional to the LineSync modes, the USB 3.0

line scan cameras have the external frame

synchronization (FrameSync) for triggering the

acquisition of 2-dimensional images. The

individual lines can be synchronized internally

or externally. The camera suppresses the data

transfer until the falling edge of a TTL signal

occurs at the FrameStart input (e.g. triggered

by breaking a light beam). Only then is

VideoValid is active and the subsequent

camera data can be transfered to the PC.

Synchronization modes for USB 3.0 Line Scan Cameras

Type A USB

connectors

USB 2.0: gray (left)

USB 3.0: blue (right)

When the USB 3.0 camera is connected to a

USB 2.0 socket of a PC then the operating sy-

stem warns the user that the equipment is ca-

pable of higher speeds with a faster socket. The

camera is automatically reduced to the USB 2.0

Hi-Speed mode, which can restrict the maxi-

mum line frequency capabilities of the higher

specification line scan camera models.

In all other respects, the USB 3.0 cameras have

full functionality under USB 2.0.

Sometimes the designation of a socket as

USB 2.0 is because the connecting USB cable

is incapable of USB 3.0 SuperSpeed rates.

Cameras with power requirements greater than

500 mA need an extra power source when

attached to a single USB 2.0 socket.

USB 2.0 Compatibility

The major characteristics can be compared

for the USB 3.0 interface and a representative

set of modern line scan camera interfaces.

USB 3.0 offers a fast data transfer at relatively

low system costs while providing a future-

proof operation of the line scan camera at its

maximum bit-depth and speed.

USB 3.0 comparison with other common interfaces

Interface

External

synchroniz-

ation

Shading

Correction

Max. Pixel

frequen cy

Extern al

power

required

Data

cable

length

Interface

System-

costs

x x 150 MHz - 5 m USB 3.0 low

x x 120 MHz x 100 m

Gigabit

Ethernet

medium

210 MHz

(3 x 70 MHz)

x 10 m

PCI/PCIe

-slot

high

USB 3.0

Data transfer and power supply (up to 4.5 W):

USB 3.0 connector, socket type micro B

Trigger signal and power supply (above 4.5 W):

Socket: Hirose series HR10A, male 6-pin

USB 3.0 Line Scan Camera Connectors

USB Cable

External Power Supply

Power cable Power Supply Unit

Software

USB 3.0 Cable

for connecting a USB 3.0

line scan camera to a PC

Connectors:

Camera: USB 3.0 plug, type μB, with

lock screws

PC: USB 3.0 plug, type A (also fits a

USB 2.0 type A socket

Order Code

SK9020.3 3 m length

SK9020.5 5 m length

Cable for External

Synchronization

of line scan cameras

with USB 3.0 interface

Connectors:

Hirose plug HR10A, female 6-pin

(for camera)

Phoenix 6-pin connector

incl. terminal block

Order Code

SK9026.3 3 m length

SK9026.5 5 m length

Combined

Synchronization

and Power Cable

for line scan cameras

with USB 3.0 interface

Connectors:

Hirose plug HR10A, female 6-pin

(for camera)

Phoenix 6-pin connector

incl. terminal block

Order Code

SK9016.1.5 1.5 m length

Shading Correction profile for permanent storage in camera memory

FrameSync

LineStart

Video

VideoValid

Transmitted

data

Timing: LineStart and FrameSync

Pin Signal Pin Signal

1 Line Sync B 4 +5 V *

2 +15 V * 5 Line Sync A

3 Frame Sync 6 GND

Rear view of the USB 3.0

line scan camera with a

USB 3.0 socket for ex-

ternal synchronization

control and for supply of

power to those came-

ras con suming more

than 4.5 W. The USB 3.0

type μB connectors are

provided with a secure

locking screw.

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 23 24

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