計測

1. Origins, structure, and basic meaning

• Structure: The spelling is 計測, read けいそく, and it combines 計, meaning calculate or gauge, with 測, meaning measure.
• Basic usage: 計測 is the measurement of a physical quantity such as speed, length, or vibration with an instrument or defined method.

2. Common pitfalls and similar expressions

• Instrumented measurement rather than general observation
  • Both examples use the form 計測. It suits technical contexts where wind or movement is assigned a value and recorded repeatedly, not merely sensed or noticed.
• A wind-speed instrument and regular bridge-motion records
  • 装置を使って風の速さを計測した。 — We measured the wind speed with an instrument.
  • 橋の揺れを定期的に計測して記録する。 — We regularly measure and record the bridge's movement.