‘6A001

Acoustic systems, equipment and components, as follows: a. Marine acoustic systems, equipment and specially designed components therefor, as follows: 1. Active (transmitting or transmitting-and-receiving) systems, equipment and specially designed components therefor, as follows: Note: 6A001.a.1. does not control equipment as follows: a. Depth sounders operating vertically below the apparatus, not including a scanning function exceeding ± 20°, and limited to measuring the depth of water, the distance of submerged or buried objects or fish finding; b. Acoustic beacons, as follows: 1. Acoustic emergency beacons; 2. Pingers specially designed for relocating or returning to an underwater position. a. Acoustic seabed survey equipment as follows: 1. Surface vessel survey equipment designed for seabed topographic mapping and having all of the following: a. Designed to take measurements at an angle exceeding 20° from the vertical; b. Designed to measure seabed topography at seabed depths exceeding 600 m; c. ’Sounding resolution’ less than 2; and d. ’Enhancement’ of the depth accuracy through compensation for all the following: 1. Motion of the acoustic sensor; 6A001 a. 1. a. 1. d. (continued) 2. In-water propagation from sensor to the seabed and back; 3. Sound speed at the sensor; Technical Notes 1. Sounding resolution' is the swath width (degrees) divided by the maximum number of soundings per swath. 2. ’Enhancement’ includes the ability to compensate by external means. 2. Underwater survey equipment designed for seabed topographic mapping and having any of the following: Technical Note: The acoustic sensor pressure rating determines the depth rating of the equipment specified in 6A001.a.1.a.2. a. Having all of the following: 1. Designed or modified to operate at depths exceeding 300 m; and 2. ’Sounding rate’ greater than 3,800 m/s; or Technical Note: ’Sounding rate’ is the product of the maximum speed (m/s) at which the sensor can operate and the maximum number of soundings per swath assuming 100 % coverage. For systems that produce soundings in two directions (3D sonars), the maximum of the ’sounding rate’ in either direction should be used b. Survey equipment, not specified in 6A001.a.1.a.2.a., having all of the following: 1. Designed or modified to operate at depths exceeding 100 m; 2. Designed to take measurements at an angle exceeding 20° from the vertical; 3. Having any of the following: a. Operating frequency below 350 kHz; or b. Designed to measure seabed topography at a range exceeding 200 m from the acoustic sensor; and 4. ’Enhancement’ of the depth accuracy through compensation of all of the following: a. Motion of the acoustic sensor; 6A001 a. 1. a. 2. b. 4. (continued) b. In-water propagation from sensor to the seabed and back; and c. Sound speed at the sensor; 3. Side Scan Sonar (SSS) or Synthetic Aperture Sonar (SAS), designed for seabed imaging and having all of the following, and specially designed transmitting and receiving acoustic arrays therefor: a. Designed or modified to operate at depths exceeding 500 m; b. An ’area coverage rate’ of greater than 570 m2/s while operating at the maximum range that it can operate with an ’along track resolution’ of less than 15 cm; and c. An ’across track resolution’ of less than 15 cm; Technical Notes 1. ’Area coverage rate’ (m 2 /s) is twice the product of the sonar range (m) and the maximum speed (m/s) at which the sensor can operate at that range. 2. ’Along track resolution’ (cm), for SSS only, is the product of azimuth (horizontal) beamwidth (degrees) and sonar range (m) and 0,873. 3. ’Across track resolution’ (cm) is 75 divided by the signal bandwidth (kHz). b. Systems or transmitting and receiving arrays, designed for object detection or location, having any of the following: 1. A transmitting frequency below 10 kHz; 2. Sound pressure level exceeding 224 dB (reference 1 μPa at 1 m) for equipment with an operating frequency in the band from 10 kHz to 24 kHz inclusive; 3. Sound pressure level exceeding 235 dB (reference 1 μPa at 1 m) for equipment with an operating frequency in the band between 24 kHz and 30 kHz; 4. Forming beams of less than 1° on any axis and having an operating frequency of less than 100 kHz; 5. Designed to operate with an unambiguous display range exceeding 5,120 m; or 6. Designed to withstand pressure during normal operation at depths exceeding 1 000 m and having transducers with any of the following: a. Dynamic compensation for pressure; or b. Incorporating other than lead zirconate titanate as the transduction element; 6A001 a. 1. (continued) c. Acoustic projectors, including transducers, incorporating piezoelectric, magnetostrictive, electrostrictive, electrodynamic or hydraulic elements operating individually or in a designed combination and having any of the following: Note 1: The control status of acoustic projectors, including transducers, specially designed for other equipment not specified in 6A001 is determined by the control status of the other equipment. Note 2: 6A001.a.1.c. does not control electronic sources which direct the sound vertically only, or mechanical (e.g., air gun or vapour-shock gun) or chemical (e.g., explosive) sources. Note 3: Piezoelectric elements specified in 6A001.a.1.c. include those made from lead-magnesium-niobate/lead-titanate (Pb(Mg 1/3 Nb 2/3 )O 3 -PbTiO 3 , or PMN-PT) single crystals grown from solid solution or lead-indium-niobate/lead-magnesium niobate/lead-titanate (Pb(In 1/2 Nb 1/2 )O 3 –Pb(Mg 1/3 Nb 2/3 )O 3 –PbTiO 3 , or PIN-PMN-PT) single crystals grown from solid solution. 1. Operating at frequencies below 10 kHz and having any of the following: a. Not designed for continuous operation at 100 % duty cycle and having a radiated ’free-field Source Level (SLRMS)’ exceeding (10log(f) + 169,77) dB (reference 1 μPa at 1 m) where f is the frequency in Hertz of maximum Transmitting Voltage Response (TVR) below 10kHz; or b. Designed for continuous operation at 100 % duty cycle and having a continuously radiated ’free-field Source Level (SLRMS)’ at 100 % duty cycle exceeding (10log(f) + 159,77) dB (reference 1 μPa at 1 m) where f is the frequency in Hertz of maximum Transmitting Voltage Response (TVR) below 10kHz; or Technical Note: The ’free-field Source Level ( SLRMS)’ is defined along the maximum response axis and in the far field of the acoustic projector. It can be obtained from the Transmitting Voltage Response using the following equation: SLRMS = (TVR + 20log VRMS) dB (ref 1μPa at 1 m), where SLRMS is the source level, TVR is the Transmitting Voltage Response and VRMS is the Driving Voltage of the Projector. 2. Not used 3. Side-lobe suppression exceeding 22 dB; d. Acoustic systems and equipment, designed to determine the position of surface vessels or underwater vehicles and having all the following, and specially designed components therefor: 1. Detection range exceeding 1 000 m; and 2. Positioning accuracy of less than 10 m rms (root mean square) when measured at a range of 1 000 m; Note: 6A001.a.1.d. includes: 6A001 a. 1. d. 2. Note (continued) a. Equipment using coherent ”signal processing” between two or more beacons and the hydrophone unit carried by the surface vessel or underwater vehicle; b. Equipment capable of automatically correcting speed-of-sound propagation errors for calculation of a point. e. Active individual sonars, specially designed or modified to detect, locate and automatically classify swimmers or divers, having all of the following, and specially designed transmitting and receiving acoustic arrays therefor: 1. Detection range exceeding 530 m; 2. Positioning accuracy of less than 15 m rms (root mean square) when measured at a range of 530 m; and 3. Transmitted pulse signal bandwidth exceeding 3 kHz; N.B:. For diver detection systems specially designed or modified for military use, see the Military Goods Controls. Note: For 6A001.a.1.e., where multiple detection ranges are specified for various environments, the greatest detection range is used.’