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WL-IPD4A: Digital Integrating Photodiode with USB

Datasheet Rev. 2a (07/2013) (474 kB PDF)

LabView Demo Rev. 2 (08/2013) (109 kB ZIP)

Description

The WL-IPD4A is a highly-integrated true gated charge integrator to be attached directly to up to 4 photo diodes. After a trigger pulse, all 4 inputs are integrated simultaneously for an adjustable amount of time (boxcar integrator). The measurement is digitized with integrated 20 bit analog-to-digital converters and transferred over the USB link to a computer.

The customer has the full choice over wavelength and sensitive area by providing the photodiodes to be integrated into the WL-IPD4A. Both silicon-based and InGaAs-based diodes with different sensitive areas can be used.

The WL-IPD4A comes in a rugged aluminum case and is powered via the USB connector.

NOTE: For new applications, consider using the IPD4B. This is the successor of the IPD4A with an improved feature set.

Features:

• simultaneous integration of up to 4 inputs at up to 1.15 kHz
• each measurement includes signal and background acquisition
• gate time 8us to 64us with internal timer
• high accuracy, low drift
• tunable full range 12pC to 350pC
• easy-to-use USB interface
• very high resolution due to 20 bit ADC
• extremely low noise integrator:
  for 350pC full scale range <10ppm noise and
  <20ppm noise down to 50pC full-scale range (typ.)
• external trigger rising or falling edge
• small form factor: 60 x 83 x 21 mm (60 x 83 x 20 mm also available)
• Comes with easy to use LabView drivers

Typical configurations:

Photo shows different typical configurations of the single channel version of IPD4A.

Alternate configuation with pluggable PCB on the bottom to mount photo diodes.

Application Notes:

Application Note Rev. 1 (07/2014) (301 kB PDF)

Femtosecond fluorescence spectroscopy based on the optical Kerr effect
R. Mundt, G. Ryseck, P. Gilch, Femtosecond spectroscopy group, Chemistry, University of Düsseldorf, Germany (May 2014)