datalogd.plugins.thorlabspm100_datasource module

class datalogd.plugins.thorlabspm100_datasource.ThorlabsPM100DataSource(sinks=[], serial_number=None, interval=1.0)

Bases: datalogd.plugins.thorlabspm100_datasource.ThorlabsPMDataSource

Provide data from a Thorlabs PM100 laser power meter.

This is a wrapper around ThorlabsPMDataSource with the appropriate USB PID used as default. See its documentation regarding configuring permissions for accessing the USB device.

Parameters:

• serial_number – Serial number of power meter to use. If None, will use the first device found.
• interval – How often to poll the sensors, in seconds.

class datalogd.plugins.thorlabspm100_datasource.ThorlabsPM16DataSource(sinks=[], serial_number=None, interval=1.0)

Bases: datalogd.plugins.thorlabspm100_datasource.ThorlabsPMDataSource

Provide data from a Thorlabs PM16 laser power meter.

This is a wrapper around ThorlabsPMDataSource with the appropriate USB PID (0x807c) used as default. See its documentation regarding configuring permissions for accessing the USB device.

Parameters:

• serial_number – Serial number of power meter to use. If None, will use the first device found.
• interval – How often to poll the sensors, in seconds.

class datalogd.plugins.thorlabspm100_datasource.ThorlabsPM400DataSource(sinks=[], serial_number=None, interval=1.0)

Bases: datalogd.plugins.thorlabspm100_datasource.ThorlabsPMDataSource

Provide data from a Thorlabs PM400 laser power meter.

This is a wrapper around ThorlabsPMDataSource with the appropriate USB PID used as default. See its documentation regarding configuring permissions for accessing the USB device.

Parameters:

• serial_number – Serial number of power meter to use. If None, will use the first device found.
• interval – How often to poll the sensors, in seconds.

class datalogd.plugins.thorlabspm100_datasource.ThorlabsPMDataSource(sinks=[], serial_number=None, usb_vid='0x1313', usb_pid='0x8078', interval=1.0)

Bases: datalogd.DataSource

Provide data from a Thorlabs laser power meter.

This uses the VISA protocol over USB. On Linux, read/write permissions to the power meter device must be granted. This can be done with a udev rule such as:

/etc/udev/rules.d/52-thorlabs-pm.rules

# Thorlabs PM100D
SUBSYSTEMS=="usb", ACTION=="add", ATTRS{idVendor}=="1313", ATTRS{idProduct}=="8078", OWNER="root", GROUP="plugdev", MODE="0664"
# Thorlabs PM400
SUBSYSTEMS=="usb", ACTION=="add", ATTRS{idVendor}=="1313", ATTRS{idProduct}=="8075", OWNER="root", GROUP="plugdev", MODE="0664"
# Thorlabs PM16 Series
SUBSYSTEMS=="usb", ACTION=="add", ATTRS{idVendor}=="1313", ATTRS{idProduct}=="807c", OWNER="root", GROUP="plugdev", MODE="0664"

where the idVendor and idProduct fields should match that listed from running lsusb. The plugdev group must be created and the user added to it:

groupadd plugdev
usermod -aG plugdev yourusername

A reboot will then ensure permissions are set and the user is a part of the group (or use udevadm control --reload and re-login). To check the permissions have been set correctly, get the USB bus and device numbers from the output of lsusb. For example

lsusb

Bus 001 Device 010: ID 1313:8075 ThorLabs PM400 Handheld Optical Power/Energy Meter

the bus ID is 001 and device ID is 010. Then list the device using ls -l /dev/bus/usb/[bus ID]/[device ID]

ls /dev/bus/usb/001/010 -l

crw-rw-r-- 1 root plugdev 189, 9 Mar 29 13:19 /dev/bus/usb/001/010

The middle “rw” and the “plugdev” indicates read-write permissions enabled to any user in the plugdev group. You can check which groups your current user is in using the groups command.

Note that you may also allow read-write access to any user (without having to use/create a plugdev group) by changing the lines in the udev rule to MODE="0666" and removing the GROUP="plugdev" part.

Parameters:

• serial_number – Serial number of power meter to use. If None, will use the first device found.
• usb_vid – USB vendor ID (0x1313 or 4883 for Thorlabs).
• usb_pid – USB product ID (0x8078 for PM100D, 0x8075 for PM400).
• interval – How often to poll the sensors, in seconds.

close()

Close the connection to the power meter.