Specifications - Acoustic Projector.pdf
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- Acoustic Projector
- Solicitation number
- N0017326QKN06
About this file
This is a Statement of Objectives (SOO) for mid-frequency acoustic projectors required by the Naval Research Laboratory (NRL), Code 7130, located at 4555 Overlook Avenue, SW, Washington, DC 20375.
NRL requires two spherical mid-frequency acoustic projectors to support ocean acoustics research and undersea systems development. The projectors must operate across a 500 Hz to 10 kHz frequency band and meet stringent acoustic performance specifications, including sound pressure levels ranging from greater than 185 dB re 1 µPa (500-1000 Hz) to greater than 210 dB re 1 µPa (3-4 kHz), omnidirectional directionality within ±0.25 dB at 4 kHz and below, resonance frequency between 3.8 and 4.2 kHz, impedance of 100 to 300 Ohm (1-4 kHz), and maximum input power of 14 kW. Physical constraints include a maximum outer diameter of 18 inches, maximum transducer weight of 140 pounds in-air, maximum operating depth of at least 180 meters in saltwater (244 meters desired), a 10-foot shielded cable with 4-pin BIRNS connector (3k-4HV-FR), and a protective/mounting cage not to exceed 15 pounds in-air.
Delivery is required within 52 weeks after receipt of order (ARO) for the first unit and 56 weeks ARO for the second unit, with FOB Destination shipping terms to NRL in Washington, DC. No professional onsite installation, specialized training, or vendor support is required. Products must carry a one-year warranty from the date of shipment covering defects in material and workmanship. The contract period of performance spans from 15 September 2026 through 15 October 2027.
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Text version
Naval Research Laboratory
4555 Overlook Ave., SW
Washington, DC 20375
Code 7130
NRL Acoustic Projector
1.0 BACKGROUND
The U.S. Naval Research Laboratory (NRL), Code 7130 requires mid-frequency acoustic projectors to conduct research for both internal programs and external sponsors. The research is critical to advance our ocean acoustics observations and undersea systems research. This mid-frequency band occurs at the crucial intersection of propagation range and spatial resolution, enabling the detection of acoustic signatures of fronts, mixing layers, internal waves, and sub-mesoscale eddies. This investment unlocks key capabilities for demonstrating new approaches to building world models for ocean sensing networks, pioneering high-resolution ocean acoustic tomography, and establishing critical baselines for forecasting sensor performance in dynamic environments like the Arctic.
2.0 PRIMARY CAPABILITIES & SALIENT CHARACTERISTICS
The systems must meet or exceed the following physical, functional, and performance specifications:
• Frequency Band: 500 Hz to 10 kHz
• Projector Construction: Sphere
• Directionality: Omnidirectional (within ± 0.25 dB at 4 kHz and below, desired above 4 kHz)
• Sound Pressure Level (SPL):
o greater than 185 dB re 1 µPa (500 to 1000 Hz) o greater than 195 dB re 1 µPa (1 to 2 kHz) o greater than 205 dB re 1 µPa (2 to 3 kHz) o greater than 210 dB re 1 µPa (3 to 4 kHz) o greater than 185 dB re 1 µPa (4 to 10 kHz)
• Resonance Frequency: between 3.8 and 4.2 kHz
• Acoustic continuity: No sharp nulls (> 2 dB) over the frequency band or strong phase reversals
• Impedance: 100 to 300 Ohm (1 to 4 kHz)
• Midband Open Circuit Voltage: -178 dB re 1V
• Maximum Input Power: 14kW
• Cable Length: 10 feet, shielded
• Connector: Mating with a 4-pin BIRNS connector (3k-4HV-FR)
• Maximum Operating Depth: at least 180 m in saltwater (244 m desired)
• Maximum Outer Diameter: 18 inches
• Maximum Transducer Weight: 140 lbs (in-air)
• Maximum Protective/Mounting Cage Weight: 15 lbs (in-air)
3.0 DELIVERY, INSTALLATION, & WARRANTY
3.1 Required Delivery Dates
Delivery Timeline: Delivery of completed projectors is required within 52 Week for first unit and
56 Weeks for the second unit After Receipt of Order (ARO).
Shipping Terms: FOB Destination. Shipping, handling, and freight costs are to be decided.
3.2 Required Location of Performance or Installation of Equipment
Delivery Destination:
US Naval Research Laboratory
4555 Overlook Ave., SW
Washington, DC 20375
Installation Requirements: No professional onsite system installation is required from the vendor.
3.3 Warranty: Manufactured products are free from any defect in material and/or workmanship, and will remain so for a period of one (1) year from the date of shipment.
3.4 Training Requirements
Requirement: No specialized training is required from the vendor.
5.0 PERIOD OF PERFORMANCE
The Contract will define the period of performance to be 15 September 2026 – 15 October 2027.
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