Location

Brunswick, ME

Start Date

1-1-1992 12:00 AM

Description

While looking ahead to regular use of the new higher thrust versions of the Titan vehicle, low-frequency pressure was flagged as a concern impacting the structural integrity of the launch pad. Initial calculations predicted pressures as high as 150 psig on launch pad structures close to the vehicle. Among the activities to address this concern was the actual measurement of pad pressures during the first west coast Titan IV launch. In addition to an active measurement system covering a limited portion of the pad, a Microballoon Tagged Material (MTM) technology was developed to back up the active system and provide additional coverage on other parts of the pad which were inaccessible to active sensor installation. The MTM is a “smart” material that can passively measure and record maximum pressure.1 In its original application, the MTM was used in a benign environment to record quasi-static maximum pressures in a fluid.2 In this new application, the MTM sensor system was hardened to survive the severe pad environment during launch and a fluidic low pass filter was employed to shield the MTM from high frequencies.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

11A

Chapter

Chapter 4: Sensors and Standards

Section

Acoustic and Ultrasonic Sensors

Pages

1097-1102

DOI

10.1007/978-1-4615-3344-3_141

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Smart Materials Used in Frequency Selective Passive Sensors

Brunswick, ME

While looking ahead to regular use of the new higher thrust versions of the Titan vehicle, low-frequency pressure was flagged as a concern impacting the structural integrity of the launch pad. Initial calculations predicted pressures as high as 150 psig on launch pad structures close to the vehicle. Among the activities to address this concern was the actual measurement of pad pressures during the first west coast Titan IV launch. In addition to an active measurement system covering a limited portion of the pad, a Microballoon Tagged Material (MTM) technology was developed to back up the active system and provide additional coverage on other parts of the pad which were inaccessible to active sensor installation. The MTM is a “smart” material that can passively measure and record maximum pressure.1 In its original application, the MTM was used in a benign environment to record quasi-static maximum pressures in a fluid.2 In this new application, the MTM sensor system was hardened to survive the severe pad environment during launch and a fluidic low pass filter was employed to shield the MTM from high frequencies.