距离模数（Distance modulus）是指星体的视星等、绝对星等，而以秒差距（Parsec, 缩写为pc）为单位的星体距离是三者间的关系称为距离模数。距离模数经常用于天文学上表示距离的一种方法。
模数转换装置为非电量转换，光导纤维对把该信息远距离传送给数字显示仪表，它能用数字量连续显示液位的变化。
Analog—to—digital converter is non—electrical transform. A pair of optical fibres can transmit signal to digital instrument to a great distance away.
采用环形数据结构有效存储大规模数据点，通过计算点到平均平面的有限误差距离进行压缩点判别。
It used ring data structure to save massive data effectively. Bounded error-distances from vertices to average plane were computed to find prime vertices for removal.
另外，字模数据的获取采用扫描取点法，向控制器发送数据采用RS - 232方式，这种方式主要的缺点是距离比较近、抗干扰性比较差。
Besides, applying the Scan Spot Method to acquire the matrix datas. Sending the dates to the controls by RS-232 Mode, such that the range is shortly, and the anti-jamming performance is no better.
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