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Design Concept for a Transducer Holding System

Design Concept for a Transducer Holding System Suitable for use with the Ohmic Instruments Model UPDM-DT-1E Radiation Force Balance. Craig E. Nelson - Consultant Engineer. Ohmic Instruments Model UPDM-DT-1E. Strengths Relatively sensitive Reasonable dynamic range Modest cost.

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Design Concept for a Transducer Holding System

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  1. Design Concept for a Transducer Holding System Suitable for use with the Ohmic Instruments Model UPDM-DT-1E Radiation Force Balance Craig E. Nelson - Consultant Engineer

  2. Ohmic Instruments Model UPDM-DT-1E • Strengths • Relatively sensitive • Reasonable dynamic range • Modest cost • Weaknesses • Various useful force sensing targets are not available • Various useful measurement chambers are not available • A stream guard is not available • A variety of transducer holding devices are not available • The installed transducer support post is not adequate for precision • Acoustic measurements such as hydrophone calibration

  3. Ohmic Instruments Model UPDM-DT-1E • Upgrade Components and Features Required for Hydrophone Calibrations Work • Transducer Holding Assembly • a. Adjustable with Precision • b. Versatile • c. Robust • d. Semi-permanent Lockdown features • Stream Guard Assembly • a. Easily installable and Removable • b. Useable with a variety of Source Transducers • Convenient Features • a. All Parts and Pieces to be Stowed Inside the UPDM Storage Case • b. No modification to the UPDM-DT-1E should be required

  4. Ohmic Instruments Radiation Force Balance Proposed Transducer Measuring Devices Overview

  5. Low Angle ¾ Front View – Thumb Nuts and Other Hardware Are Not Shown

  6. Original Accessory Support Post is Retained Mounts with Existing Screw Holes ¾ Top View – Thumb Nuts and Other Hardware Are Not Shown

  7. Robust and Flexible Jigging Setup ¾ Side View – Thumb Nuts and Other Hardware Are Not Shown

  8. Jigging Locks Down Rigidly Sound Field is Illustrated Cutaway Side View – Thumb Nuts and Other Hardware Are Not Shown

  9. Cutout for Force Target Support Bracket “Upgrade Kit” fits within the original platform envelope More Jigging can be installed on this side Top View – Thumb Nuts and Other Hardware Are Not Shown

  10. Ohmic Instruments Radiation Force Balance Proposed Transducer Measuring Devices Individual Components

  11. Ohmic Instruments Radiation Force Balance – Top Surface

  12. Stream Guard Assembly

  13. Panasonic Model V318 Sound Field Force Sensing Cone – Panasonic Model V318 Source Transducer with Sound Field (in yellow)

  14. Black Rubber Sound Absorber on Sides and Bottom Deep Drawn Steel Shell Measurement Chamber - Standard Issue

  15. Lower Rail Both rails have the same cross section Upper Rail

  16. Upper Carriage Stainless Steel 1/2 in Diameter Support Rods Both rails have the same cross section Lower Carriage Assembly Thumb Nuts and Other Hardware Are Not Shown

  17. Upper Cross Bar Thumb Nuts and Other Hardware Are Not Shown Panasonic Model V318 Transducer Holder (Two Parts)

  18. Summary • The Ohmic Instruments Ohmic Instruments model UPDM-DT-1E requires enhancement in order to be effectively used for hydrophone calibration and other QA related tasks • A set of components has been designed to substantially enhance the UPDM-DT-1E capabilities • The proposed “upgrade kit” will allow accurate hydrophone calibrations to be performed • The proposed “kit” can be easily modified or adjusted to allow a variety of useful quality assurance tasks • A lesser level of upgrade will not suffice for the intended purposes

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