NIRS and fNIRS Subsystems

Multi-Channel Parallel TCSPC Systems

  • 12-Channel Parallel TCSPC Systems
  • 24-Channel Parallel TCSPC Systems
  • 32-Channel Parallel TCSPC Systems
  • Each Channel Contains one SPC-150NX Module
  • All Channels Operated from One Computer
  • LabView Software, Extendable by User
  • Electrical Time Resolution 3.5 ps fwhm
  • Internal Timing Jitter < 1.6ps rms
  • Centroid of IRF stable within < 0.4 ps rms over 100 seconds

Multi-Channel ps Diode Laser Systems

  • High-Power BDS-MM Multi-Mode ps Diode Lasers
  • Wavelengths from 640 nm to 850 nm
  • Repetition Rate 50 MHz, 20 MHz
  • CW Equivalent Power 15 mW at Near-Gaussian Pulse Shape
  • Crates with up to 8 Lasers
  • Electronic Power Control
  • Fast On-Off Capability
  • Multiplexing Capability
  • Internal Power Stabilisation
  • Control Integrated in LabView TCSPC Software

Multi-Detector Assemblies

  • Crates with eight PMCS-150 Detectors
  • Thermo-Electric Cooling
  • NIR Photocathode
  • 100 to 120 ps fwhm IRF Width
  • Internal Overload Shutdown
  • Low Susceptibility tp Magnetic Fields

 

NIRS and fNIRS applications require a large number of laser and detection channels with high time resolution and high timing stability. Especially in fNIRS, effects under investigation cause changes in the DTOFs of no more than a few picoseconds. It is therefore mandatory that the timing drift and, especially, the low-frequency timing wobble of the TCSPC modules is in the sub-picosecond range. Moreover, a parallel architecture is desirable to achieve high throughput and low channel crosstalk.
The bh NIRS subsystems combine the extraordinarily high timing stability of the SPC-150NX with the high throughput of a multichannel system. The systems are complemented by 8-channel laser modules and 8-channel detector modules. Each laser module contains eight BDS-MM lasers with high power, perfect pulse shape, high intensity stability, and extremely low timing drift. Each detector module contains eight PMCS-150-20 detectors with high sensitivity, fast IRF, extremely low timing shift with the count rate, and low susceptibility to magnetic fields.

The bh TCSPC Handbook
8th edition, September 2019

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