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深度基准
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In this paper,A standard Rockwell Hardness meter for indentation depth measurement based on the coherent nature of the laser and using the wavelength of the light beam from the He-Ne laser as the measuring unit is described.The main measuring system employs a scheme in which wedge prism,step phase shift,and pyramidal prism are used to eliminate the effects of optical feedback and optical rotation.Data processing of the optical signals in the laser coherent system and technical performance of the machine are...

In this paper,A standard Rockwell Hardness meter for indentation depth measurement based on the coherent nature of the laser and using the wavelength of the light beam from the He-Ne laser as the measuring unit is described.The main measuring system employs a scheme in which wedge prism,step phase shift,and pyramidal prism are used to eliminate the effects of optical feedback and optical rotation.Data processing of the optical signals in the laser coherent system and technical performance of the machine are also briefly described.

本文介绍了基于激光的干涉特性,以氦氖激光器发出的波长为(基准)计量单位、测量压入深度的基准洛氏硬度机。主测量系统中选用楔形镜、阶梯移相、角锥校镜来消除回光与旋光影响的方案。同时简要介绍了激光干涉系统中光信号的数据处理及本机技术性能。

In the late fifties,according to the tidal guaranttee used for depth dete- rmination of coastal zone in our country,the step control criterion for depth measurement during the investigation in coastal zone were discussed. Since the requirements of mean sea level,sea level,sea level datum,and instantaneous sea level are respeetively different,the observation must be separately carried on to roplace long-term work at every tidal station,and to permit the limited manpower for tidal observation to meet the need...

In the late fifties,according to the tidal guaranttee used for depth dete- rmination of coastal zone in our country,the step control criterion for depth measurement during the investigation in coastal zone were discussed. Since the requirements of mean sea level,sea level,sea level datum,and instantaneous sea level are respeetively different,the observation must be separately carried on to roplace long-term work at every tidal station,and to permit the limited manpower for tidal observation to meet the need for depth measurement,and at the same time,to obtain the tidal data of coastal zone as more as possible.

根据我国五十年代末进行海岸带深度测量的潮汐保证情况,探讨海岸带调查中深度测量的分级控制基础。根据平均海面、深度基准面和瞬间海面各不相同的要求,有区别地分开进行观测,以代替每个验潮站都进行长期观测,使有限的潮汐观测力量用于保证深度测量需要的同时,能够尽可能多地获取海岸带的潮汐资料。

Based on the actually measured depths at Yellow River Delta for years, they were inducted into the identical projection,proportion and datum of depth.we can see from the calculation of depth variation that there are both alluvial and silt in the Yellow River Delta,while the river flows over the estuary,siltation takes place in the new channel and alluviation in the old channel,but the siltation plays the leading role in this process. The key of the question is that the site of oil dock is determined by the flow...

Based on the actually measured depths at Yellow River Delta for years, they were inducted into the identical projection,proportion and datum of depth.we can see from the calculation of depth variation that there are both alluvial and silt in the Yellow River Delta,while the river flows over the estuary,siltation takes place in the new channel and alluviation in the old channel,but the siltation plays the leading role in this process. The key of the question is that the site of oil dock is determined by the flow couorse at the estuary of Yellow River.Though there is an unstable factor for arranging the flow course at the estuary,the flow is strong at non- tidal point and is good for the sand and mud transportation,In recent years, the no.5 pile emerges in Bo-Hai,the water outside of this pile is deep and situated in the high productive region of oil field,so that here is the ideal place for selecting the site of oil dock.Under that cases,the water and soil conservation,the sand and mud transportation to land at the lower reach of the river have not yet been received considerable efficiency.It is necessary for the oil dock by retaining an approciate distance acted as the area to be silted up in future.It is also practical to maintain an economic profit of the channel by dredging,thus it may also shorten the tango of dista- nce.In a word,it is good for the oil dock to keep away from the coast and not near to it.

根据黄河三角洲历年实测的深度,归化至同一的投影,比例和深度基准面,计算深度变化,看到:黄河三角洲有冲有淤,黄河行水河口淤,停水故道冲,以淤为主;一般淤进0.2公里/年.黄河河口流路是决定油港港址的关键,尽管有河口流路安排这个不定因素.根据无潮点流速大,有利于泥沙输送;近代黄河泥沙已把五号桩凸出于渤海;五号桩外水深,且处油田高产区,油港以五号桩为理想位置。在黄河水土保持和下游泥沙输往陆地还未收到显著效果的情况下,油港需予留适量的距离作为备淤区。若挖泥维持航道的经济效果可行,也可缩短港区与海岸的距离.

 
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