What is the NOHD and ENOHD for CENTAURI?

Modified on Thu, 30 Nov 2023 at 10:54 AM

The distance from CENTAURI’s aperture window at which the intensity of the lasers becomes lower than the Maximum Permissible Exposure (MPE) on the cornea and on the skin is called the Nominal Ocular Hazard Distance or “NOHD.”

The measurement assumes that the device is operating at its maximum level of power. Any distance closer to CENTAURI than the NOHD is considered dangerous to the operator.

The Extended Nominal Ocular Hazard Distance (ENOHD) is the distance away from the source of the laser that is considered dangerous to the operator if they are using an optical viewing system (like binoculars, for example) to site the device.

Transcelestial does NOT recommend the use of optical viewing systems during the installation or operation of CENTAURI. Alignment of CENTAURI may be performed quickly and easily with the help of the device’s built-in camera and alignment software.

For reference, the NOHD and ENOHD for both lasers in CENTAURI are shown in the table below.

Beacon Laser (808nm, Pulsed)

DistanceBeam Dimensions
NOHD2 m / 6.5ftH: 9 cm / 3.5 inW: 23 cm / 9.0 in
ENOHD5 m / 16.4 ftH: 23 cm / 9.0 inW: 60 cm / 23.6 in

Data Laser (1550 nm, Continuous Wave)

NOHD33 m / 108 ft0.7 cm / 0.28 in
ENOHD150 m / 492 ft3.1 cm / 1.22 in

NOTE: The beacon laser is emitted in an oval pattern, which is why we provide measurements for height and width of the beam. The data laser is circular, so measurement of the beam diameter is sufficient.

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