collimation [kɒlɪ'meɪʃən]

例句:

• Collimation must be capable of being checked in the field.
  准直必须能够在现场进行校核.
  
• Experiments show a strong effect on the measured value if collimation angle is increased.
  实验表明,准光角增大会对测定值产生很大的影响.
  
• The error introduced by a finite collimation angle is a systematic one in apparent transmission.
  一定准光间所带来的误差是包括在表现透光率中的一种系统误差.