| 1. | Ratio of the front to back wave
波束前后向比值 |
| 2. | The research on testing the integrity of the body of model piles through the method of back wave
反射波法检测桩身完整性的模型研究 |
| 3. | Distribution property analysis of the electromagnetic field in back wave - guide feed - in microwave oven
背向波导馈入式微波炉电磁场分布 |
| 4. | The obstacle is detected based on the back wave reflected from road surface . 3
自动标定超声波探头的架设高度，探头与地面间有无遮挡物的判断以地面回波为基准； 3 |
| 5. | The crosswell seismic data processing mainly consists of two aspects : one is crosswell tomography imaging processing , and another is crosswell back wave stacking imaging processing
井间地震资料数据处理主要包括两个方面：井间层析成像处理和井间反射波叠加成像处理两大部分。 |
| 6. | Numerical simulations and experiments show that improved algorism of lti is effective to trace rays including back waves and suitable for computerized tomography to complex object
数值模拟和试验研究表明lti改进算法是一种有效的射线追踪方法，能追踪回波，适合复杂对象的层析成像。 |
| 7. | Arranged signal activating lock circuit and time - base control circuit in the sound wave receiving circuit to take the initial signal of back wave as the valid one in the cycle , thus to improve the ratio of signal vs . noise and detective precision
在超声波接收电路中设有信号触发锁定电路和时基控制电路。实现以各探头中最早收到的回波信号为本检测单元的有效信号，有效提高信噪比和检测精度； 4 |
| 8. | Relativistic back wave oscillator ( rbwo ) with a coaxial structure has a big power capacity of system . with large radius electron beam to decrease the space charge effects without usage of high current , hence the rbwo can work well at a lower axial guide magnetic field
同轴返波管具有很大的功率容量,可以采用大半径电子注,在工作电流不变的情况下空间电荷效应大幅度降低,因而可工作在低磁场状态。 |
| 9. | In principle , ultrasonic sensors are suspended over a road , which keep emitting pulse signals periodically to nearby and feed back waves to decide existence of any obstacles , thus to detect the speed , height , length , different sizes ( heavy , medium and small ) of moving vehicles and accumulative flow as well as length of motorcade . optionally , it can be applied to multitude driving lanes simultaneously for traffic data . by integrating and analyzing these measured data , the necessary figures concerning traffic flow may be obtained , which are fundamental basis guiding road buildings
本课题设计的是一种悬挂式超声波车流多信息检测器，通过悬挂于路面上方的超声波探头向路面周期性地发射脉冲信号，利用地面回波来判断遮挡物地存在，可用于检测行驶中的机动车车速、车高、车长、大中小分型以及累计车流量、车队长度等信息，并可用于多个车道车流信息的同时检测，综合这些测量参数可获得车流量的必要数据，可为公路建设提供必要的基础依据。 |
| 10. | This design has distinctive technical features as follows : 1 . applied multi - sensor construction . well - calculated distance and crossing angles between sensors aiming at a same target makes it possible to acquire more accurate back waves than single sensor construction
采用多探头结构，多个探头之间相互之间有一定距离和交织发射角度，对准同一个被测物体的反射面，可使检测范围内的每一个固定点上反射面的可测方位个数较单探头有所增加，可大大降低回波漏检率； 2 |
