ISO 16063-42:2014 振動および衝撃変換器の校正方法—パート42：重力加速度を使用した高精度の地震計の校正 | ページ 2

Foreword

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The committee responsible for this document is ISO/TC 108, Mechanical vibration, shock and condition monitoring, Subcommittee SC 3, Use and calibration of vibration and shock measuring instruments.

ISO 16063 consists of the following parts, under the general title Methods for the calibration of vibration and shock transducers:

• Part 1: Basic concepts
• Part 11: Primary vibration calibration by laser interferometry
• Part 12: Primary vibration calibration by the reciprocity method
• Part 13: Primary shock calibration using laser interferometry
• Part 15: Primary angular vibration calibration by laser interferometry
• Part 16: Calibration by Earth's gravitation
• Part 21: Vibration calibration by comparison to a reference transducer
• Part 22: Shock calibration by comparison to a reference transducer
• Part 31: Testing of transverse vibration sensitivity
• Part 41: Calibration of laser vibrometers
• Part 42: Calibration of seismometers with high accuracy using acceleration of gravity

The following parts are under preparation:

• Part 17: Primary calibration by centrifuge
• Part 32: Resonance testing — Testing the frequency and the phase response of accelerometers by means of its excitation
• Part 33: Testing of magnetic field sensitivity
• Part 43: Calibration of accelerometers by model-based parameter identification

Angular vibration calibration by comparison to reference transducers, calibration of hand-held accelerometer calibrators, and calibration of vibration transducers with built-in calibration coils are to form the subjects of future parts 23, 44 and 45.

1 Scope

This part of ISO 16063 specifies the instrumentation and procedure to be used for the accurate calibration of seismometer sensitivity using local gravitational acceleration (local Earth’s gravitation; local value for the acceleration due to the Earth’s gravity) as a reference value.

It is intended generally to be applied to a servo-type accelerometer with/without a velocity output, which usually has a mass position output in the category of a wide-band seismometer with a bandwidth from 0,003 Hz to 100 Hz.

The method specified enables the user to obtain static sensitivity for the seismometers up to 10⁻⁵ m/s² (which corresponds to 1 mGal and approximately 1 ppm of the gravitational acceleration).

The combined and expanded (k = 2) uncertainty of applied acceleration achieved by this method is 10⁻⁶ m/s² (0,1 mGal). When the absolute gravimeter described in this part of ISO 16063 is used, the uncertainty of applied acceleration can be suppressed to 5 × 10⁻⁸ m/s² (5 μGal). The relative expanded uncertainty of calibration, excluding the uncertainty due to the device under test (DUT), is 0,5 %.

The intended end-usage of the seismometer to be applied is as follows:

• a) measurement and observation for the earth science including geophysics usage;
• b) measurement and observation for disaster prevention, such as detecting the precursor of a land slide;
• c) diagnosis for the soundness of a building structure and foundation soil in civil engineering;
• d) observation for nuclear-test detection.

2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

Bibliography