LC1917 Просмотр технического описания (PDF) - PerkinElmer Inc

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LC1917

Low-Profile Analog Line Scan Camera

PerkinElmer Inc 

Analog Line Scan Cameras

Input Signals (contd.)

and a half clock cycles prior to the end

of read out. Because there are extra

stages in the CCD sensors readout regis-

ter, a minimum number of MCLK

cycles (the number of elements on the

CCD sensor plus 41) must exist

between successive LT commands.

The maximum line-scan period is 20

milliseconds. Integration times longer

than 20 ms can introduce higher levels

of dark current, which reduces the

dynamic range of the sensor. Longer

integration times are possible, however,

if the camera is cooled, which reduces

dark current. Specific application char-

acteristics, such as light level and rate

of object motion, will determine the

optimum setting. Timing details are

shown in Figure 3.

Output Signals

The LC1917-series camera provides

three output synchronization signals:

Camera Clock (CCLK), Line Enable

(LEN), and Camera Line Transfer (CLT).

The Camera Clock (CCLK) operates at

the MCLK frequency and is synchro-

nized to the analog video. The output

of the CCLK signal can be used to cap-

ture analog video data by a frame

grabber or digitizer.

The Line Enable (LEN) signal brackets

the valid analog video. The signal

becomes high two CCLK periods before

the first valid pixel and goes low two

CCLK periods before the last valid

pixel. The video output is a contiguous

pixel data stream with a dynamic

range (defined as peak video divided

by rms pixel noise) of greater than 2500:1.

The Camera Line Transfer (CLT) output

signal is an internally generated sync

signal. Its falling edge indicates the

start of a line readout sequence. This

signal may be used for controlling

strobes, shutters or other accessories

of the users system.

Video Signals

The LC1917 camera features an

adjustable DC offset. This offset is con-

trolled by a potentiometer, located

underneath the set screw on the body

side of the camera adjacent to active

Table 2. Camera Description

Parameter

Physical

Connector

Power Requirements

Output

Control Signals

Sensor

Operational

Variable

Optical Lens

Sensor Alignment

Dimensions

Type

Cable Length

Operating Voltages

Connection

Data Rate

Type

Connection

User Supplied

User Communications

Camera Supplied

Connection

Type

Window

Gain Adjustment

Dark Offset Adjustment

Description

No lens adaptor - optical

Within ±0.005” of of mounting hole

2” x 3.077” x 0.75”

Amp C-216297

26-pin High Density Male

Maximum 10 meters

+12 VDC, +5 VDC, -12 VDC

Through 26-pin connector

1 - 5 MHz

Analog Differential Video

Through 26-pin connector

Master Clock (MCLK)

Line Transfer (LT)

RS-422 Control Signals

Camera Clock (CCLK)

Line Enable (LEN)

Camera Line Transfer (CLT)

Through 26-pin connector

PerkinElmer RL1024PAG

Glass

5-Turn Potentiometer

5-Turn Potentiometer

Figure 3. Camera Timing Diagram

CCLK

The minimum period between LT must be 41 + 1024 CLKS or 1065 clocks

LT

LT minimum = 1.5 CLKS

CLT equals

CLT

6 CLKS

CLT to LEN 11 CLKS

LEN

LEN leads and trails video by 2 CLKS

Video

1024 CLKS

www.perkinelmer.com/opto

DSP-205.01A - 4/2001W Page 3

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