Atmel AKYLA HD 20 LV User manual

Features

•3-CCD Prismatic Color Linescan Camera

•High Sensitivity and High SNR Performance Linear CCD Sensors

•1024 Pixels 10 x 10 µm or 14 x 14 µm

•2048 Pixels 10 x 10 µm

•Excellent CCD Alignment Accuracy

•LVDS Format Data Rate: 20, 25, 33, up to 40 Mpixels/s

•Dynamic Range: 12-bit Channel

•Single Power Supply: 20 to 36 VDC

•Flat Field Correction Included

•Easy Camera Control with Programmable Settings

•Memory for Storing up to 60 Configurations

•High Reliability - CE and FCC Compliant

Description

The AKYLA™is a rugged, high-performance, fully digital color linescan camera for

demanding industrial applications. It consists of a high-accuracy 3-CCD architecture

with a choice of either 1024 or 2048 pixel sensors at speeds up to 40 million pixels per

second and per color channel. The AKYLA cameras are optimized for high sensitivity

and precise color recognition.

Applications

• Web Inspection

• Inspection of Natural Materials like Food, Wood, Ore, Minerals and Lumber

• Recycling

• Quality Control in Printing Processes

• Texture Recognition

LVDS

3-CCD Color

Linescan

Camera

AKYLA™

HD 20/25/33/40

1010/1014/2010 LV

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AKYLA HD 20/25/33/40 LV

1. Precautions

1.1 Manual

Read the manual carefully before using the camera for the first time.

1.2 Camera Handling

The camera is a sensitive optical device, handle with care at all times. Do not drop the camera

and avoid mechanical shock to the camera.

1.3 Foreign Matters

Do not spill liquids on the camera. The camera is not waterproof.

Do not drop metallic objects into the camera. Doing so may cause a short-circuit and damage

the camera.

1.4 Cleaning

Keep the shade cap on the camera head when it is not in use to avoid contaminating the prism.

If the front surface of the prism is very dirty, we recommend the camera be serviced by Atmel,

since the surface area of the prism cannot be fully accessed from the front.

If there are small amounts of contaminants or dust on the prism surface, use a clean lint-free

cotton swab or other non-abrasive medium dipped in acetone or pure alcohol to clean its sur-

face. Shake excess solvent off before touching the prism surface to avoid streaking. Atmel is not

responsible for scratches or damage inflicted by the customer to the front surface of the prism.

To clean the camera’s exterior casing, use a soft, dry cloth. In case of severe stains, use a small

amount of pure alcohol or isopropyl alcohol. Do not use acetone or other volatile solvents such

as benzene or thinners.

1.5 Servicing

Do not open the camera. The camera’s warranty expires immediately upon opening. Only autho-

rized service personnel may open the camera.

1.6 Ventilation

Allow sufficient air circulation around the camera. If this condition is not met, the camera may

shut down during operation; it is designed to do so to prevent damage to the optical assemblies.

Further increase of temperature may damage the camera.

1.7 Storage

Do not store the camera at a temperature over 55°C. There is a permanent temperature indica-

tor inside the camera, which is installed to ensure that if the camera is damaged due to over-

heating, the warranty of the camera becomes void.

1.8 Electromagnetic Fields

Do not operate the camera in the vicinity of strong electromagnetic fields (above the require-

ments of CE conformity). This may cause erroneous operation of the camera.

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AKYLA HD 20/25/33/40 LV

1.9 Transportation

Transport the camera in its original packaging. If the original packaging has been discarded,

package the camera with care in a thick layer of soft, preferably anti-static material. Do not use

material that may cause the camera to fall to the bottom of the package while transporting. Do

not transport with the optics attached.

2. Camera Characteristics Overview

Note: 1. LSB in 12-bit mode

2. Measured front face temperature

Table 2-1. Camera Characteristics Overview

Parameter Value Unit

Sensor Characteristics at Maximum Pixel Rate

Data rate 20 MHz 25 MHz 33 MHz 40 MHz MHz

Resolution 1024 2048 1024 2048 1024 2048 1024 2048 Pixels

Max line rate 17.8 9.3 22 11.5 27.3 14.1 34.4 18.3 kHz

Anti-blooming x 100 –

Radiometric Characteristics

Dynamic range 8 - 12 Bit

Spectral range 400 - 700 nm

Non-linearity < 0.1 %

Typical gain range Gmin

Gmax

30 dB

Saturation equivalent exposure

Red

Green

Blue

10 µm pitch

120

151

14 µm pitch

10 µm pitch

240

130

100

14 µm pitch

1.2

1.5

4.8

(1)

LSB/(nJ/cm2)

S/N 69 42 dB

Mechanical and Electrical Interface

Size (w x h x l) 115 x 106 x 122 mm

Lens mount F –

Sensor alignment <0. 2 max, 0.1 typical Pixel

Power supply DC, single 20 to 36 V

Power dissipation < 26 W

Operating temperature 5 to 40 (non-condensing) cooling is required for 33 and 40 MHz camera °C

Storage temperature -10 to 55 (non-condensing) °C

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AKYLA HD 20/25/33/40 LV

3. Technical Specifications

Notes: 1. Measured front face temperature.

2. For 33.3 MHz and 40 MHz cameras, additional cooling is required when the ambient temperature is above 20°C.

3. Within 5 to 95% of the saturation exposure. Equals ±4 LSB on a 10-bit scale when gains are above 300.

Table 3-1. Technical Specifications of the AKYLA HD Series of Cameras with 10 µm Sensors

Parameter Symbol Min Typical Max Unit Notes

Number of pixels N

N–1024

2048 –––

Pixel size – – 10 x 10 – µm 100% fill factor

Data rate per CCD – – – 40 MHz –

Gain control G – 100x – – Response time: 500 ms max.

A/D conversions – – 12 – bit –

Supply voltage Vsupp 20 24 36 VDC

Ripple: ±10%, voltage + ripple must

stay within 20 to 36 V

Power consumption – – 12 to 17 26 W –

Weight m – 1.3 – kg Without lens

Operating temperature Top 5–40 °C 41 to 104°F (1)(2)

Storage temperature Tst -10 – 55 °C 14 to 131°F

Humidity, operation – 5 – 85 % Relative, non-condensing

Humidity, storage – 5 – 95 % Relative, non-condensing

Linearity – – 99.6 – % (3)

Photo response non-

uniformity, pixel-to-pixel PRNU – ±2 ±10 % –

Saturation level – – 4095 4095 DU Digital units

Table 3-2. Technical Specifications of the AKYLA HD Series of Cameras with 14 µm Sensors

Parameter Symbol Min Typical Max Unit Notes

Number of pixels N – 1024 – – –

Pixel size – – 14 x 14 – µm 100% fill factor

Data rate per CCD – – – 40 MHz –

Gain control G 12x 100x – – Response time: 500 ms max

A/D conversions – – 12 – bit –

Supply voltage Vsupp 20 24 36 VDC

Ripple: ±10%, voltage + ripple must

stay within 20 to 36 V

Power consumption – – 12 to 17 26 W –

Weight m – 1.3 – kg Without lens

Operating temperature Top 5–35 °C 41 to 95°F(2)

Storage temperature Tst -10 – 55 °C 14 to 131°F

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AKYLA HD 20/25/33/40 LV

Notes: 1. Measured front face temperature

2. For 33.3 MHz and 40 MHz cameras, additional cooling is required when the ambient temperature is above 20°C.

3. Within 5 to 95% of the saturation exposure. Equals ±4 LSB on a 10-bit scale when gains are above 300

4. Conformity

4.1 Standard

The cameras have been tested using the following equipment:

• Shielded power supply cable

• CameraLink®data transfer cable ref. 14B26-SZLB-500-OLC (3M)

• Linear AC-DC power supply

Atmel recommends using the same configuration to ensure compliance with the following

standards.

4.2 European

AKYLA cameras comply with the requirements of the European directive 89/336/EEC, EMC

(Electromagnetic Compatibility) . We herewith declare that this product complies with the follow-

ing provisions.

• Emission CISPR 22 (1997)

• Immunity IEC 61000-6-2 (1999)

5. Camera Overview

5.1 Color Separation

The incoming light is separated into three (Red, Green and Blue) color images by an RGB beam

splitter (Figure 5-1). The spectral distribution of each color is standardized and well-known. By

attaching a CCD to each of these color outputs, it is possible to measure the intensity of each

color image.

Humidity, operation – 5 – 85 % Relative, non-condensing

Humidity, storage – 5 – 95 % Relative, non-condensing

Linearity – – 99.6 – % (3)

Photo response non-

uniformity, pixel-to-pixel PRNU – ±2 ±10 % –

Saturation level – – 4095 4095 DU Digital units

Table 3-2. Technical Specifications of the AKYLA HD Series of Cameras with 14 µm Sensors (Continued)

Parameter Symbol Min Typical Max Unit Notes

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AKYLA HD 20/25/33/40 LV

Figure 5-1. RGB Color Separation Beam Splitter

The CCDs are aligned to obtain a perfect image of the three measured color components. All

three CCDs see exactly the same area of the object at the same time. The corresponding pixels

of all three sensors are optically positioned in the same place (Figure 5-2). This makes color

analysis simpler and does not require any line matching or synchronizing. The resolution of the

camera is the same as for the individual CCD array.

Figure 5-2. Alignment of CCD Linear Arrays

6. Optical Considerations

6.1 Spectral Response of the Beam Splitter Prism

Figure 6-1. Spectral Distribution of the RGB Color Beam Splitter

Blue

Green

Red

Incoming Light

RGB Color Line

3 x CCD

Transmission (%)

400 450 500 550

Wavelength (nm)

blue green red

600 650 700

100

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AKYLA HD 20/25/33/40 LV

Figure 6-1 shows the prism’s reaction at each wavelength. Transmissivity is well balanced, both

in the sense of peak response and the total amount of light passed to the sensors at each wave-

length (sum of the three separate curves). This all results in excellent color separation compared

to tri-linear CCD sensors.

Figure 6-2. Spectral Response of AKYLA Cameras

Figure 6-2 illustrates the spectral transmissivity measurements of the beam splitter prism and

the spectral sensitivity of the CCDs.

6.2 Camera Operation

The CCDs convert the incoming light to electrical charges. The amount of charge generated in

each of the individual pixels is directly proportional to the intensity of light they receive. The

resulting charge packets are transferred into two high-speed CCD shift registers and transferred

to the output charge-to-voltage converters of the CCDs. The generated output video is Correlate

Double Sampled (CDS) and the result is amplified by two user-accessible gain factors prior to

digitization into 12 bits.

Relative Spectral Response (%)

100

120

350 400 450 500 550 600 650 700 750

Wavelength (nm)

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AKYLA HD 20/25/33/40 LV

Figure 6-3. Camera Synoptic

The AKYLA HD cameras operate in a monoshot mode. For each rising edge of the NewLine sig-

nal, the camera responds by sending out the digital data stream of the previous linescan time

period. The output frequency is constant. The distance in time between two NewLine edges can

be set to any value above the specified minimum. The reverse of this time is the line rate (Hz).

The AKYLA HD cameras have been optimized for high-speed applications. Therefore, best per-

formance is achieved at line rates of hundreds of lines per second or above.

Other programmable functions include:

• Color channel specific programmable exposure control

• Color channel specific programmable analog gain

• Color channel specific programmable digital gain

• Programmable offset

• Retrieval of the PROM version number

• Non-volatile memory banks for programmable settings

CCD

CDS

CDS D

CCD

CTRL

PCU

VIN

OSC

Ctrl Out

Data Out

Timing

Temperature

Monitoring

Voltage

Monitoring

Non Volatile

Memory

Gain Ctrl

12-bit

Ctrl In

RS-232 2

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AKYLA HD 20/25/33/40 LV

7. Timing

Figure 7-1. Relationship Between the Data Output and NewLine (CC1) Signals

The effective integration time can be made shorter than the actual linescan period (time between

two consequent NewLine pulses) by holding the ExpCtrl (CC2) signal in its active state until the

beginning of the targeted interception period. Within the linescan period, whenever the ExpCtrl

input is held low, no charge can be collected into the pixels. This is why the actual integration

time is the time span between the (last) rising edge of the ExpCtrl input signal and the next rising

edge of the NewLine input.

Figure 7-2. Line Rate and Integration Time

The two most common modes of operation of linescan cameras are free-run mode or encoder

input-driven mode.

In the free-run mode, both the linescan period and the integration time can be precisely con-

trolled. But if the linescan period is determined by an encoder input, the integration time can best

be kept constant by using the encoder input pulse for generating the ExpCtrl signal. The New-

Line pulse is sent after a constant delay (see ”Exposure Control Mode (Address 204)” on page

30).

The AKYLA camera constantly monitors all the internal supply voltages and the internal temper-

ature. Temperature warnings can be monitored via the LED of the rear panel and the

temperature output signal of the data connector.

Line 1

Line 0 Line 1 Line 2 Line 3

Line 2 Line 3

Data Out

NewLine

(CC1)

Line Scan Period

NewLine

Exp Ctrl

Pixel Strobe

Data

Data Read Out

Line Scan Period

Integration Time

R R

N N+1

N-1

GGBB

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AKYLA HD 20/25/33/40 LV

7.1 Timing Diagrams

Figure 7-3. Parallel Color Channel Mode, 20/25 MHz per Channel

Figure 7-4. Timing Diagram

NewLine

Input

Change of Line

Internal

ExpCtrl

Input

Line Valid

Output

Pixel Strobe

Output

Data 35-0

N = 1024 or 2048

N-1 N - - 1 2 3 N-2

T4 T5

N-1 N - - 1 2

Table 7-1. Timings

Symbol Parameter Min Nom Max Unit

T1 NewLine low 0.05 10 – µs

T10

T11

T12

i - 2

Pixel Strobe

Data 35-0 i - 1 i i+1

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