NVG-4040 NVIS Radiometer

The Gamma Scientific NVG-4040 is an advanced spot radiometer for night-vision device measurement. Unique to the NVG-4040 is its ability to perform NVIS-A, NVIS-B and NVIS-C radiance measurements (competing systems measure only NVIS-A and NVIS-B radiance).

In addition, the NVG-4040 is optimized for a full range of photopic measurements. Lightweight, portable and cost-effective, this feature-rich unit conforms to MIL-L-85762A and MIL-STD-3009, and is ideally suited for measuring displays and instrument panels used with night-vision goggles.

The state-of-the-art technology is based on our TIA-3000 detector laboratory standards, the highest performance primary-standard available today.

 

Features include six user-adjustable measurement apertures (5°, 2°, 1°, 0.5°, 0.33° and 0.1°) an NVIS-compatible touch screen, a fully automated USB interface for remote computer control and an internal calibration source. The instrument comes standard with a 50-mm f/1.4 lens with extension rings for macro measurements; a full range of optional lenses is available.

Features

  • Measurements down to 5×10-5 fL
  • Exceeds MIL-L-85762A and MIL-STD-3009 specifications
  • Touch screen ANVIS compatible display
  • Radiance and irradiance measurements with accessories
  • Six different measurement field-of-views (5°, 2°, 1°, 0.5°, 0.33° and 0.1°)
  • Automated gain control
  • Internal calibration source
  • NVIS-A, NVIS-B, NVIS-C (leaky green), and photopic measurement filters
  • Two automated filter wheels
  • USB interface
  • Battery operated
  • Field portable

NVG-4040 Night Vision Radiometer Specifications

Analog to Digital Resolution 24 bit (1 part in 16,777,216)
Local Control Programmed controls on touch screen interface
Display 1/4 VGA, 320×240 pixel super twist LCD with blue Night Vision Imaging System compatible backlight
(12 levels of backlighting including “NVG” off position)
Measuring Field Aperture Automated 5, 2, 1, 1/2, 1/3, 1/10 degree
(Angular subtense calculated with 50 mm focal length lens focused at infinity, see separate chart for spot sizes at finite working distances)
Field-of-View 8 degrees
Optics Standard 50 mm f/1.4 lens with extension tube set
(Optional lenses and/or cosine receptor (CR-4040 diffuser), available upon special request)
Filter Turrets 1st filter turret, four position filter
2nd filter turret, four Neutral Density positions
Spectral Response, Standard Filters NVIS A, NVIS B, NVIS C, CIE S 010/E:2004 Standard Photometric Observer
Standard Neutral Density Filters Open, ND2, ND4, ND6
Internal Calibration Source Automatic implementation
Computer Control USB
Photometric Accuracy ±2% of reading (NIST traceable 2856° K source, 500 ±100 cd/m2 at 25 ±2°C)
AR Accuracy 10% NVIS class A, 15% NVIS class B, 17% NVIS class C (using Gamma Scientific class C digital relative spectral responsivity data) from RS-12 standard values
Sensitivity See chart below for specific aperture filter combinations
Measurement Capabilities Luminance, NVIS A, NVIS B, NVIS C
(Illuminance option available upon special request)
Size 10.5” L x 5.75” W x 7.5” H (26.5 cm L x 14.5 cm W x 10 cm H)
Weight 11.8 lbs. (5.4kg) with internal battery
Power Internal Lithium-Ion battery, 90 to 250 Volts AC, 50/60 Hz

 

NVG-4040 Sensitivity
Collection Optics Condition Measurement Units Aperture Size in Degrees
5 2 1 0.5 0.33 0.1
50mm Lens Photometric Filter fL (Max)
fL (Min)
cd/m2 (Max)
cd/m2 (Min)
1.22E+05
8.12E-06
4.17E+05
2.78E-05
7.50E+05
5.00E-05
2.57E+06
1.71E-04
3.06E+06
2.04E-04
1.05E+07
6.98E-04
1.24E+07
8.24E-04
4.24E+07
2.82E-03
2.75E+07
1.83E-03
9.43E+07
6.28E-03
3.19E+08
2.13E-02
1.09E+09
7.29E-02
50mm lens NVG Class A Filter NRA (Min) 1.21E-12 7.24E-12 3.00E-11 1.22E-10 2.72E-10 3.13E-09
50mm lens NVG Class B Filter NRB (Min) 4.02E-12 2.41E-11 1.00E-10 4.06E-10 9.05E-10 1.04E-08
50mm lens NVG Class C Filter NRC (Min) 2.41E-11 1.45E-10 6.00E-10 2.44E-09 5.43E-09 6.27E-08

 

NVG-4040 Measuring Field Coverage
Collection Optics Condition Working Distance Total View Aperture Size in Degrees
5 2 1 0.5 0.33 0.1
50mm Lens 13 inches
317.2 mm
2.3
58.4
1.137
27.75
0.454
11.08
0.227
5.54
0.113
2.77
0.070
1.72
0.023
0.55
50mm Lens (12mm Extension) 7 inches
170.8 mm
1.24
31.5
0.612
14.94
0.244
5.96
0.122
2.98
0.061
1.49
0.038
0.92
0.012
0.30
50mm Lens (20mm Extension) 4 inches
97.6 mm
0.7
17.8
0.350
8.54
0.140
3.41
0.070
1.70
0.035
0.85
0.022
0.53
0.007
0.17
50mm Lens (36mm Extension) 2.5 inches
61 mm
0.45
11.4
0.219
5.34
0.087
2.13
0.044
1.06
0.022
0.53
0.014
0.33
0.004
0.11
50mm Lens (12mm, 20mm, 36mm Extension) 1.37 inches
34 mm
0.26
6.6
0.118
2.88
0.047
1.15
0.024
0.58
0.012
00.29
0.007
0.18
0.002
0.06