1. The sound intensity level, the sound pressure level, and the index of sound pressure – residual sound intensity level if verified. 检定声强级和声压级测量的偏差和声强仪的声压-残余声强指数。
2. The light intensity distribution exhibits straw hat shape on a certain conditions, in other word to say, the central light intensity is less than acroteric light intensity. 在一定条件下，截面上的光强分布会呈现中心光强小于周围光强的“草帽型”分布。
3. Acoustic intensity measurement system based on two-microphone acoustic intensity probe. Acoustic intensity can be calculated by acoustic pressure signal measured by two-microphone. 声强测量大多基于双传声器声强探头系统，通过两个传声器测得的声压信号间接求出声强。
4. By fluviograph survey water level, after clear signal processing, inputs the control water level in PLC, then carries on the control by PLC to the water level control valve to adjust the water level. 由水位计测量水位，进行信号处理后输入控制水位的PLC中，然后由PLC对水位控制阀进行控制以调节水位。
5. This changes the level of brain wave activity from the awake level (Beta) to the asleep level (Alpha) or the deep sleep level (Theta). 这使大脑清醒状态时的脑波活动贝塔状态改变至睡眠层次（阿尔法）或深度睡眠状态（太塔，θ）。
