phototube

简明释义

英[ˈfəʊtəʊtjuːb]美[ˈfotoˌtʊb]

n. [电子] 光电管；光电器

英英释义

单词用法

同义词

反义词

例句

1.The phototube, a very special type of electron tube, is the heart of the talking-picture projector.

光电管，一种非常特殊的电子管，是有声电影放映机的心脏。

2.A simple method for determining absolute sensitivity of phototube is described.

本文描述了测定光电管绝对灵敏度的一种简单方法。

3.The efficiency of a liquid scintillation detector may be varied by placing different optical filters between the vessel and the phototube.

在闪烁瓶和光电倍增管之间放置不同的滤光片以改变液体闪烁探测器的效率。

4.The electrons freed in the phototube cross over to the metal rod.

光电管中被释放的电子从金属片渡越到金属杆上。

5.Sensor for the front car of the phototube.

传感器为车前排的光电管。

6.The count rate at the extrapolation of bias to zero varies monotonously with the anode current of phototube and tends to the activity of source as the inverse anode current approaches zero.

甄别电压外推到零时的计数率随光电倍增管阳极电流而改变，当阳极电流的倒数趋于零时，计数率趋于被测源的活度。

7.The count rate at the extrapolation of bias to zero varies monotonously with the anode current of phototube and tends to the activity of source as the inverse anode current approaches zero.

甄别电压外推到零时的计数率随光电倍增管阳极电流而改变，当阳极电流的倒数趋于零时，计数率趋于被测源的活度。

8.One method of measuring fluorescence by multiplier phototube is proposed in this paper.

提出了一种用光电倍增管测量荧光的方法。

9.Phototube AD conversion, steering duty cycle, PWM-driven motor, the Hall element to modify the details of gun parts.

光电管AD转换，舵机占空比，PWM驱动电机，霍尔元件测速部分细节自行修改。

10.These electrons will not pass into the phototube because of the insulation on the metal plate.

由于金属板上有绝缘层，这些电子不能进入光电管。

11.In the lab, the phototube helped detect low levels of radiation.

在实验室中，光电管帮助检测低水平的辐射。

12.The phototube is essential for converting light signals into electrical signals in many devices.

光电管在许多设备中对于将光信号转换为电信号至关重要。

13.During the lecture, the professor explained how a phototube works in a spectrometer.

在讲座中，教授解释了光电管在光谱仪中的工作原理。

14.The scientist used a phototube to measure the intensity of light emitted during the experiment.

科学家使用了一个光电管来测量实验中发出的光强度。

15.The new model of the camera features a built-in phototube for improved low-light performance.

这款新型号的相机配备了内置的光电管，以改善低光照表现。

作文

In the realm of modern technology and scientific exploration, the term phototube refers to a specialized device that converts light into electrical signals. This remarkable invention has played a significant role in various fields, including photography, astronomy, and medical imaging. Understanding the functionality and applications of a phototube is essential for anyone interested in the intersection of science and technology.A phototube, often referred to as a photomultiplier tube (PMT), operates on the principle of photoelectric effect. When light photons strike the surface of the phototube, they displace electrons, creating an initial electric current. This current is then amplified through a series of dynodes within the tube, resulting in a substantial output signal. The amplification process allows for the detection of even the faintest light signals, making phototubes incredibly sensitive devices.The applications of phototubes are vast and varied. In the field of photography, they are used in light meters and exposure systems, allowing photographers to capture images with precision and accuracy. Astronomers utilize phototubes in telescopes to detect distant celestial objects by measuring the faint light they emit. Additionally, in medical imaging, phototubes are crucial components in devices like positron emission tomography (PET) scanners, where they help in detecting gamma rays emitted by radioactive tracers in the body.Moreover, the versatility of phototubes extends beyond these traditional uses. They have found applications in scientific research, particularly in particle physics experiments, where detecting low levels of light is essential for studying subatomic particles. The ability of phototubes to operate in extreme conditions, such as low temperatures or high radiation environments, further enhances their utility in experimental setups.Despite their advantages, phototubes also come with certain limitations. For instance, they are sensitive to magnetic fields and can be affected by temperature variations, which may lead to inaccurate readings. Additionally, while they offer high sensitivity, their response time may not be suitable for all applications, particularly those requiring rapid measurements.In recent years, advancements in technology have led to the development of alternatives to phototubes, such as avalanche photodiodes (APDs) and silicon photomultipliers (SiPMs). These newer technologies aim to address some of the limitations associated with traditional phototubes, offering improved performance in certain scenarios. However, phototubes continue to be widely used due to their proven reliability and effectiveness in various applications.In conclusion, the phototube is a pivotal component in numerous technological and scientific advancements. Its ability to convert light into measurable electrical signals has made it indispensable in fields ranging from photography to medical imaging. As technology continues to evolve, the role of phototubes will likely adapt, but their fundamental principle of operation will remain a cornerstone of light detection and measurement. Understanding phototubes not only enriches our knowledge of optical technologies but also opens up new avenues for innovation and discovery in the scientific world.

在现代科技和科学探索的领域中，术语phototube指的是一种专门的设备，它将光转换为电信号。这一非凡的发明在摄影、天文学和医学成像等多个领域发挥了重要作用。理解phototube的功能和应用对于任何对科学与技术交叉领域感兴趣的人来说都是至关重要的。phototube，通常被称为光电倍增管（PMT），是基于光电效应原理工作的。当光子撞击光电管的表面时，会使电子位移，从而产生初始电流。然后，这个电流通过管内的一系列倍增电极进行放大，最终产生可观的输出信号。放大过程使得即使是最微弱的光信号也能被检测到，这使得phototubes成为极为灵敏的设备。phototubes的应用广泛而多样。在摄影领域，它们用于光度计和曝光系统，使摄影师能够精确准确地捕捉图像。天文学家在望远镜中利用phototubes来探测遥远的天体，通过测量它们发出的微弱光线。此外，在医学成像中，phototubes是正电子发射断层扫描（PET）等设备中的关键组件，它们帮助检测体内放射性示踪剂发出的伽马射线。此外，phototubes的多功能性超越了这些传统用途。它们在科学研究中找到了应用，特别是在粒子物理实验中，检测微弱光线对于研究亚原子粒子至关重要。phototubes在极端条件下（如低温或高辐射环境）工作的能力进一步增强了它们在实验设置中的实用性。尽管有其优势，phototubes也存在某些局限性。例如，它们对磁场敏感，并可能受到温度变化的影响，从而导致读数不准确。此外，虽然它们提供高灵敏度，但响应时间可能不适合所有应用，特别是那些需要快速测量的场景。近年来，技术的进步导致了替代phototubes的发展，如雪崩光二极管（APDs）和硅光子倍增器（SiPMs）。这些新技术旨在解决与传统phototubes相关的一些限制，在某些情况下提供更好的性能。然而，由于其经过验证的可靠性和有效性，phototubes仍然广泛使用。总之，phototube是众多技术和科学进步中的关键组成部分。它将光转换为可测量的电信号的能力使其在从摄影到医学成像等多个领域不可或缺。随着技术的不断发展，phototubes的角色可能会适应，但其基本工作原理仍将是光检测和测量的基石。理解phototubes不仅丰富了我们对光学技术的知识，也为科学世界中的创新和发现开辟了新的途径。