ARMS Acoustic Radiometer Measurement System

ARMS Specifications:

• Calibration with weight or with calibrated ultrasound source
• Measures power in the »1 mW to >50 W range
• Automatic averaging of measurements
• Precision approx. 2% for a 100 mW sound beam
• Absolute Accuracy approx. 10% for a 100 mW sound beam

Sensor Mechanism:

• Interface to Computer through Advantech PCL812PG Analog IO Card and 37-conductor cable
• Integral temperature sensor
• Specially designed submersible electromagnetic servo force balance with Hall effect position sensor
• Connection to electronics through 25-conductor cable
• Sensor designed for long-term submersion

Target:

• Proprietary absorbing composite material, cast with grooved face to minimize reflections
• Standard target is 76mm (3.00") in diameter
• Targets can be interchangeable

Tank and Vibration Isolation System:

• Transparent Acrylic Tank 305 mm x 457 mm x 305 mm tall (12" x 18 " x 12" tall)
• Anodized Aluminum Frame is 16" x 29" x 40" tall
• Hose Connections with Valves for Filling/Emptying and for Water
• Conditioning
• Vibration isolation - tank is suspended by springs covered with rubber for damping

System Controller:

The ARMS uses a standard PC running MS Windows, version 3.1 or 3.1. This PC can be provided by the customer or by NTR Systems, as desired. A 486 machine with 4 MB of ram and 200 MB of hard drive capacity would be a minimum recommended system. For the card that is used by the ARMS, one full-length 8- or 16-bit ISA slot is required.

ARMS Software:

• Automatically measures power, averaging up to 10000 measurements
• Auto and Manual measurement modes
• Calibration mode
• Display of measurements, averaged measurements, and statistics
• Prints detailed report on measurement
• Detailed information on the test setup is stored in the ARMS file
• A "comments" section of the file lets you record notes on the test being performed
• File format is a self-explanatory text format, with information clearly labeled
• Data can be imported into spreadsheets or custom programs for further analysis
• Runs under MS Windows, version 3.1 or 3.11
• Source code available

Additional Information:

• Approximately 600 Watts electrical power required
• Distilled or filtered water is recommended
• Can be connected to an NTR water conditioning system which filters, heats, degasses, and de ionizes the water
• The transducer to be tested and its excitation system are usually provided by the user.
• A means of turning the sound off and on is required

ARMS Data and Plots