人类可见的物质只占到整个宇宙总物质的17%，剩下的83%是所谓“暗的”，意味着它们不会释出或反射可测光。
The matter we can see makes up just 17% of matter in the Universe; the remaining 83% is "dark", meaning it does not reflect or emit detectable light.
不幸的是，许多内置测光器最多在30秒左右就变得不太精确了。
Unfortunately, most in-camera light meters become inaccurate or Max out at about 30 seconds.
相机的测光方式要设置在局部测光或点测光方式，测光点对着你想要锁定曝光值的目标，按下锁定钮。
To make this work, use the partial metering mode (or spot metering mode) over the subject where you want to lock the flash output then press the asterisk (*) button.
佳能的E -TTLII甚至可以测出相机和主要被摄对象间的距离并将此作为测光的考虑因素之一。
Canon's E-TTL II even measures the distance to the main subject and that also becomes part of the evaluation taking place.
通常，你可以用大点的光圈测光(这样，测量的曝光时间就在30秒以内)，随后缩小光圈，相应地增加曝光时间。
Usually one can first meter using a larger aperture (so that the metered exposure time is under 30 seconds), then stop down as necessary and multiply the exposure time accordingly.
另外一项控制Mackey博士和他的小组也要求被测学生完成一项精神任务，以确保光把精力投入到照片上不会混淆他的结果。
As an added control, Mackey and his team also asked the students to complete a mental task, to make sure that merely paying attention to the picture wasn't confounding his results.
测光的时候，是使用ElinchromSkyport无线电引闪器触发闪光灯。
When I measured the light I used the Elinchrom Skyport radio transmitter to test trigger the lightning.
测光传感器是测定可见光谱中能量的仪表。
Photometric sensors are devices that measure energy in the visible spectrum .
人体结构的复杂性，骨骼结构的不规则性决定了光测法仍将继续发挥其重要作用。
Since the complexity of body structure and irregularity of bone structure, thus the photoelasticity method is still playing its important role.
原理上定心误差在光传播和光反射里是可测的。
In principle centring errors are measurable in transmitted light and in reflection.
针对这种情况，探讨了一种利用机(舰)载光测设备测量方位标修正惯导航向偏差的方法。
This paper discusses a new method that utilizes optical measuring instruments to measure the azimuth points and collimates the navigation deviation.
试验结果对于这一新型光测方法的实际应用有指导意义。
The experiment result will be a guidance for actual application with this novel optical measurement.
本文给出了39个不同类型的恒星脉泽源的近红外测光结果。
Near infrared Photometry of 39 stellar maser sources of different types is presented in this paper.
应用这种方法，可以提高光测设备白天测星的能力及测量船的总体测量精度，是一种准实时的、切实可行的白天测星方法。
The experimental results prove that this method may enhance the ability in measuring star in daytime of optical measurement device and whole measurement precision of measurement ship.
数字散斑测量是一种非接触、全场测量的高精度光测方法。
Digital speckle measurement is a kind of non-contact and full-field optical measurement method.
然后以特殊船型双隧道的“新黄测1 号水文测量船”为例，重点对如何应用FASTLINE系统对特殊船型的船舶线型进行光顺设计作了介绍。
Then with hydrologic survey ship "Xin Huang survey 1" the paper as an example emphatically explains how to apply FASTLINE system to design and fair the ship lines with special features.
其中利用光学斩光器对被测光进行调制使其与方波参考信号相关是对微弱光信号进行锁相检测的一种常用方法。
Using the optical chopper to modulate the detected light to make it related to the reference squarewave signal is a common method of locking phase detection of weak signals.
要保证测量光聚焦在待测表面，自动聚焦控制是非常重要的。
To keep the measurement light focusing on the measured surface, an automatic focus unit is very important.
本文以应用较多的光测技术为主，综述了细观力学测量中光、声、磁、射线等试验技术。
In this paper the measurement methods based on optics, acoustics, magnetics and radiology are mentioned for research of mesomechanics.
在显微物镜的成象光路中，增加一块振荡反射镜，使被测线宽的放大象相对窄缝扫描，将光学边界信息转变为梯形电脉冲。
Bying adding an oscillator mirror in the imaging path, thus the enlarged image will be scanned by the narrower slit, and the optical boundary information is converted into gradient electrical pulse.
文中采用陈至达(1962年)的光测应力分析基本方程，并导出适合于光弹性数据处理的三次样条函数。
Basic equation of photoelastic stress analysis by Chen (1962) is adopted; and a cubic spline function suitable for processing of photoelastic data is derived.
讨论有关天体测量中的测光问题，介绍一些地面天体测量仪器和空间天体测量望远镜的测光研究。
The Problem of astrometric photometry is discussed in this paper. The photometric capabilities on both the ground-based astrometric instruments and space telescopes are presented.
扼要地评述了以晶体的辐射效应为基础的热释光测年和光释光测年两种测年技术方法的进展、关系以及问题。
Thermoluminescence and Optically stimulsted luminescence are dating techniques based on the radiation effect of crystals. The Progress, relationship and problems of both methods are reviewed.
本文介绍和评价了国内外现场用油液污染度测量的方法，并选定光测法进行研究。
This article introduces and evaluates the domestic and foreign on-site hydraulic fluid contamination measurement methods and optical measuring means selected to study.
介绍了用于光测电压的晶体的选择与晶体加工设计中的光轴选定原则。
This paper introduces the selection of crystal used for voltage measurement with optic, and the principle for selecting the optic axle.
介绍了用于光测电压的晶体的选择与晶体加工设计中的光轴选定原则。
This paper introduces the selection of crystal used for voltage measurement with optic, and the principle for selecting the optic axle.
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