Description:

head sample laser

Displays the laser power. The command "laser" is normally used for this purpose.

head sample bp

Displays the two signals from the beam position sensor. Sensor 0 is close to the LVD board, and Sensor 1 is close to the laser diode. Used for integration.

head sample focus

Displays the sum, difference, and error values for the two signals from the optical distance sensor. It also displays the current lens position as measured by the Hall effect sensor.

The difference between the two signals is an uncalibrated measure of the distance between the final lens and the plate.

The sum of the two signals is a measure of the total amount of light incident on the detector.

The error signal is the difference between the target distance specified by the foffset head NVS parameter and the actual distance measured by the optical distance sensor. The actual distance is calculated by dividing the difference signal by the sum signal and multiplying the result by a scaling constant. See the head NVS parameter "foffset".

head sample edge

Indicates whether the autofocus laser beam is on or off the plate, and displays the value of the sum signal from the optical distance sensor. To change the edge calibration parameters, use the command "plot edge cal".

head sample lpos

Displays the lens position.

Applies To:

• Thermal

Syntax:

Notes:

See Also:

• Command: head
• Command: laser
• Command: focus init
• Command: plot edge
• Command: list status
• NVS: head foffset