Accelerometer Frequently Asked Questions

You are likely using a small Accelerometer such as the NP-2110 or NP-3210 (approximately 6mm in diameter). As you know, depending on the contact conditions of the pickup, contact resonance and attenuation can occur, making it difficult to detect high frequencies. (Please refer to the instruction manual for frequency characteristics related to installation.) For accurate measurements, it is essential to ensure the pickup is in close contact and securely fixed.

Based on this,

(1) Secure the pickup using screws, super glue, or the like.
(2) Securely fix a metal jig such as a bolt to the object, and attach the pickup to its head with super glue.
(3) Install the pickup so that the entire pickup is covered with hardening agent.
(4) Fix the object to the target with an embedding hardening agent.

This is a possibility, but there's a chance the pickup can't be reused, so careful consideration is necessary.

Also, although I assume this has already been measured, how about examining the frequency characteristics of a square block of the same material to document the vibration transmission characteristics of the material? In reality, there is a limit to high frequencies, and it's not that such frequencies cannot be measured, but rather that they are internally attenuated, and it's possible that high frequencies don't exist at all.

Other methods include non-contact measurements using LV-series Laser Doppler Vibrometer or displacement meters.