Document ID: chunk:federal_register_of_legislation:F2024L01024:front:0:p207
Version: federal_register_of_legislation:F2024L01024
Segment Type: other
Provision Reference: 
Character Range: 594847–597681

errors and having an angular "accuracy" of 10 µrad (microradians) or less (better);
3. Optical equipment and components, specially designed for coherent beam combination in a phased‑array "SHPL" system and having any of the following:
a.  An "accuracy" of 0.1 µm or less, for wavelengths greater than 1 µm; or
b.  An "accuracy" of λ/10 or less (better) at the designed wavelength, for wavelengths equal to or less than 1 µm;
4. Projection telescopes specially designed for use with "SHPL" systems.
6. A. 005. g. 'Laser acoustic detection equipment' having all of the following:
1. CW "laser" output power equal to or exceeding 20 mW;
2. "Laser" frequency stability equal to or better (less) than 10 MHz;
3. "Laser" wavelengths equal to or exceeding 1,000 nm but not exceeding 2,000 nm;
4. Optical system resolution better (less) than 1 nm; and
5. Optical Signal to Noise ratio equal to or exceeding 103.
           Technical Note:
           For the purposes of 6A005.g., 'laser acoustic detection equipment' is sometimes referred to as a "Laser" Microphone or Particle Flow Detection Microphone.
 MAGNETIC AND ELECTRIC FIELD SENSORS
6. A. 006. "Magnetometers", "magnetic gradiometers", "intrinsic magnetic gradiometers", underwater electric field sensors, "compensation systems", and specially designed components therefor, as follows:
Note: 6A006 does not apply to instruments specially designed for fishery applications or biomagnetic measurements for medical diagnostics.
6. A. 006. a. "Magnetometers" and subsystems as follows:
1. "Magnetometers" using "superconductive" (SQUID) "technology" and having any of the following:
a. SQUID systems designed for stationary operation, without specially designed subsystems designed to reduce in‑motion noise, and having a 'sensitivity' equal to or lower (better) than 50 fT (rms) per square root Hz at a frequency of 1 Hz; or
b. SQUID systems having an in‑motion‑magnetometer 'sensitivity' lower (better) than 20 pT (rms) per square root Hz at a frequency of 1 Hz and specially designed to reduce in‑motion noise;
6. A. 006. a. 2. "Magnetometers" using optically pumped or nuclear precession (proton/Overhauser) "technology" having a 'sensitivity' lower (better) than 20 pT (rms) per square root Hz at a frequency of 1 Hz;
6. A. 006. a. 3. "Magnetometers" using fluxgate "technology" having a 'sensitivity' equal to or lower (better) than 10 pT (rms) per square root Hz at a frequency of 1 Hz;
4. Induction coil "magnetometers" having a 'sensitivity' lower (better) than any of the following:
a. 0.05 nT (rms) per square root Hz at frequencies of less than 1 Hz;
b. 1 x 10‑3 nT (rms) per square root Hz at frequencies of 1 Hz or more but not exceeding 10 Hz; or
c. 1 x 10‑4 nT (rms) per square root Hz at frequencies exceeding 10 Hz;
5. Fibre optic "magnetometers" having a 'sensitivity'