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NEUBRESCOPE NBX-7031U

Features

  • Hybrid measurement using TW-COTDR (Rayleigh) and PPP-BOTDA (Brillouin)
  • Maximum measurement distance: 80km
  • Maximum spatial resolution: 2.5cm
  • Double-ended

NBX-7000 Series Lineup Comparison

Model Rayleigh Brillouin Minimum Readout Resolution Highest Spatial Resolution Maximum Measurement Distance Dimensions
NBX-7035 TW-COTDR PSP-BOTDR (single-ended) 5 cm 5 cm 80 km 450×658×295 mm / 35 kg
NBX-7031U TW-COTDR PPP-BOTDA (double-ended) 2.5 cm 2.5 cm 80 km 450×658×295 mm / 35 kg
NBX-7031
*Custom model		 TW-COTDR PPP-BOTDA (double-ended) 1 cm 2 cm 27 km 456×485×286 mm / 30 kg

Specification

Main Features Separation of strain and temperature measured in single fiber,
PPP-BOTDA / BOTDR / TW-COTDR / COTDR
Function PPP-BOTDA TW-COTDR
Laser wavelength 1550±2 nm 1556 nm ～ 1558 nm
Distance range 50 m ～ 80 km
Measurement frequency range 9～13 GHz 192000～193000 GHz
Range of strain measurements -30,000 ～ +40,000 με
(-3% ～ +4%)		 -3,000 ～ +4,000 με
(-0.3% ～ +0.4%)
Measurement frequency scan step 1, 2, 5, 10, 20, 50 MHz 1, 2, 5, 10, 20, 50, 100, 200 MHz
Readout resolution 5 cm (default), 2.5 cm (minimum)
Sampling points 600,000 (default), 3,000,000 (maximum)
Average count settings 2^5～2^23 times (including Hardware Average Count 2^5～2^16)
Function PPP-BOTDA TW-COTDR
Pulse width, ns 0.25 0.5 1 2 5 10 - 0.25 0.5 1 2 5 10 20
Spatial resolution, cm 2.5 5 10 20 50 100 - 2.5 5 10 20 50 100 200
Dynamic range, dB*1 0.5 1 1.5 3 3.5 6 - 1.5 3 5 8 10 12 14
Max. measurement distance, km*2 0.5 1 2 5 10 18 - 5 10 15 25 33 40 45
Optical budget, dB*1*8 1 2 5 7 10 12 - 2 5 7 10 12 14 16
Measurement accuracy (1σ)*3*4 15 με / 0.75 ℃ 7.5 με / 0.35 ℃ 5 με / 0.25 ℃ - 20 nε / 0.001 ℃
Repeatability (1σ)*3*4*5 10 με / 0.5 ℃ 2.4 με / 0.1 ℃ 2 με / 0.1 ℃ - 10 nε / 0.0005 ℃
Measurement time*6*7 5 seconds (minimum) - 10 seconds (minimum)
Measurement accuracy
for hybrid mode		 10 με / 0.5 ℃
Repeatability
for hybrid mode		 5 με / 0.25 ℃
Function BOTDR
Pulse width, ns 2 5 10 20 50 100 200
Spatial resolution, cm 20 50 100 200 500 1000 2000
Dynamic range, dB*1 1 3 5 8 12 15 16
Max. measurement distance, km*2 2 10 15 25 40 45 50
Optical budget, dB*1*8 2 5 7 10 14 17 18
Measurement accuracy (1σ)*3*4 20 με / 1.0 ℃ 15 με / 0.5 ℃
Repeatability (1σ)*3*4*5 10 με / 0.5 ℃ 7.5 με / 0.25 ℃
Input-output fiber Single mode optical fiber
Fiber connector FC-APC (factory default) / SC-APC (factory option)
Suitable fiber Single mode optical fiber
Power supply AC 100～240 V, 50/60 Hz, 350 VA
Laser class Class 1 (IEC60825-1 : 2001)
Dimensions / Weight approx. 450(W)×658(D)×295(H) mm / 35 kg
Operating temperature 10～40 ℃, Humidity below 85% (no dew condensation)
Storage temperature 0～50 ℃
Input/output interface USB 2.0 x2, USB 3.0 x2, LAN x2, DisplayPort x1
Place of production Japan
Updated: 2026/04/22
Note: High speed measurement capabilities are available for Brillouin type measurements only.
*1 Based on 2^15 average cycles
*2 Based on average fiber loss of 0.3 dB/km using SM fiber (UV type)
*3 Based on the measurement of strain-free SM fiber (UV type)
*4 Based on the measurement of strain-free SM fiber (UV type) and in a constant-temperature environment
*5 The maximum deviation range of the measurement values for 5 consecutive measurements at 100 consecutive points
*6 Within the setting of a 50 m range, 2^13 count settings and 41 scan steps, except the time of Pre-Pump Adjustment (for BOTDR and PPP-BOTDA)
*7 Within the setting of a 50 m range, 2^10 count settings and 401 scan steps, excluding the time for Pulse Output Adjustment (for TW-COTDR)
*8 Within the allowable range adjusted by the optical power, except in cases where nonlinear phenomena
*1–*5 are based on a frequency scan step of 5 MHz when using PPP-BOTDA, with Pre-Pump Adjustment and Auto Frequency Adjustment on
*1–*5 are based on a frequency scan step of 250 MHz when using TW-COTDR, with Pre-Pump Adjustment and Auto Frequency Adjustment on