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, corrected and updated September 2019


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