Digital Ultra Low Noise Boxcar Photodiode Integrator with USB
LEAD TIME: 4 WEEKS
The IPD4B is a highly-integrated boxcar integrator to be attached directly to up to four photo diodes. After a trigger pulse, all four inputs are integrated simultaneously for an adjustable amount of time between 6 μs and 1 second (boxcar integrator). The measurement is digitized using integrated 20 bit analog-to-digital converters with ultra low noise and exceptional dynamic range. Integration results are transferred over the USB link to a computer (alternatively: 3.3 V UART, SPI, I2C).
In a triggered mode, the IPD4B can continuously acquire four signal measurements and transfer them over the USB link at a trigger rate of up to 1.1 kHz. This allows shot-to-shot measurements in systems with 1 kHz repetition rate. Internal triggering additionally allows gap-less boxcar integration mesurements with gate times 500 μs to 1 s e.g. for monitoring.
The USB interface registers itself as virtual serial port (VCP) for direct and easy integration into lab control software such as LabView. Communication uses a simple text-based protocol.
- Simultaneous integration of up to four inputs at up to 1.15 kHz
- Each measurement includes signal and background acquisition
- Adjustable gate time 6μs to 1s with internal timer (*)
- High accuracy, low drift
- Tunable full scale 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.)
This corresponds to a dynamic range in excess of 1:105
Shot noise limited for many applications
- External trigger rising or falling edge (TTL or LVDS) (*)
- Tunable trigger delay up to 1 second: (*)
This eliminates the need for an external delay generator and can be used to achieve "negative" delays for repetetive triggering.
- Internal trigger with adjustable rate up to 1 kHz (*)
- Additionally allows continuous gap-free integration for gate times 500 μs to 1 s on all four channels simultaneously
- Small form factor: 60 x 40 x 22 mm (*)
- Comes with easy to use LabView drivers
- (*) marks improvement over the IPD4A
- Laser pulse monitoring and signal
measurement in 1 kHz systems
- Shot-to-shot pulse noise measurements
- Digital two or four segment photodiodes
(applies predecessor IPD4A)
R. Mundt, G. Ryseck, P. Gilch, Femtosecond spectroscopy group, Chemistry, University of Düsseldorf, Germany (May 2014)
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