microradian

Thân thiện

An engineer measures a laser beam's divergence in microradians.

Definition

1. Noun:
   • A unit of angular measurement: A microradian is a unit used to measure very small angles. It is equal to one millionth (1/1,000,000) of a radian.
   • A subdivision of the milliradian: Specifically, a microradian is defined as one thousandth (1/1,000) of a milliradian.

Usage

• The word "microradian" is a technical term used primarily in fields like optics, physics, engineering, and astronomy to express extremely precise angular measurements.
• It is typically used with numerical values and abbreviations (e.g., µrad).

Examples

• Noun:
  • The laser beam's divergence was measured at 5 microradians.
  • For high-precision machining, the alignment must be accurate to within a few microradians.
  • The telescope's pointing stability is better than one microradian.

Advanced Usage

• Scientific Notation: Angles are often expressed using the SI prefix "micro-" (symbol µ), where 1 µrad = 10⁻⁶ rad.
• Comparative Context: Used to compare minute angular displacements or resolutions, such as in interferometry or the jitter of a satellite.

Variants and Related Words

• Radian (n): The SI unit for measuring angles, based on the radius of a circle.
• Milliradian (n): A unit equal to one thousandth (1/1,000) of a radian. A microradian is 1/1000 of a milliradian.
• Microradian (symbol: µrad): The standard abbreviation.

Synonyms

• Micro-rad: An informal or abbreviated synonym.
• (One millionth of a radian): A descriptive synonym defining its value.

Notes

• There are no common idioms or phrasal verbs associated with this highly specialized scientific term.
• Its usage is almost exclusively literal and quantitative in technical contexts.

Học thuật

Noun

1. a unit of angular distance equal to one thousandth of a milliradian