An important reason why the industrial endoscope can be competent for the defect detection inside the equipment is that it has a light source to illuminate the inspected area, which does not depend on the lighting conditions of the inspected area. On the surface, this is to meet the needs of the objective detection environment, but in fact, it is very important for the application and promotion of the industrial endoscope

有着30年的行业经验，为您介绍目前应用广泛的电子工业内窥镜光源的用途、种类及优缺点比较。

With 30 years of industry experience, I will introduce the uses, types, advantages and disadvantages of endoscope light sources widely used in electronic industry.

电子内窥镜的光源，其用途就是提供照明，辅助获取明亮的检测图像。检测环境千差万别，对照明的要求也是不同的，例如铸件的深孔检测，空间非常狭小，照明要求很容易满足，而类似压力容器这种大空间的检测，需要大功率光源才能达到满意的照明效果。 因此最好采用高亮度照明的光源，并且强度可以根据环境进行调节，满足不同检测环境的需求。

The light source of electronic endoscope is used to provide illumination and assist in obtaining bright detection images. The testing environment varies greatly, and the requirements for lighting are also different. For example, for deep hole testing of castings, the space is very narrow, and the lighting requirements are easy to meet. For large space testing such as pressure vessels, high-power light sources are required to achieve satisfactory lighting effects. Therefore, it is best to use a high brightness light source, and the intensity can be adjusted according to the environment to meet the needs of different detection environments.

在工业内窥镜应用的早期，多采用弧光灯作为光源，根据所采用气体的不同分为氙气灯光源或卤素灯光源等。由于色温与日光的色温相当接近，光照强，因此弧光灯应用还是很多的。缺点主要是启动时间较长，由于要靠金属电极之间的电弧来发光，达到预定亮度有一定耗时，再有就是成本较高、寿命相对较短，而且发热，给设备散热带来一定的要求。

In the early stage of industrial endoscope application, arc lamp is mostly used as light source, which is divided into xenon lamp light source or halogen lamp light source according to the different gases used. Because the color temperature is quite close to the color temperature of sunlight and the illumination is strong, arc lamps are still widely used. The main disadvantage is that the start-up time is long. Because it depends on the arc between metal electrodes to emit light, it takes a certain time to achieve the predetermined brightness. In addition, it has high cost, relatively short service life and heating, which brings certain requirements for equipment heat dissipation.

随着科学技术的发展，一些新光源相继问世，其中LED光源很快被应用到内窥检测领域，并有取代弧光灯的趋势。LED光源的优势包括：

With the development of science and technology, some new light sources have come out one after another. Among them, LED light sources are soon applied to the field of endoscopic detection, and there is a trend to replace arc lamps. The advantages of LED light sources include:

能耗低，发热低，低碳环保；

Low energy consumption, low heating, low carbon and environmental protection;

穿透性强，在各种复杂的工业检测环境中都可以保持较高的辨识度

It has strong penetration and can maintain a high degree of identification in various complex industrial detection environments

寿命长达数万小时，是氙气灯的百倍有余，应用于内窥镜设备中，基本不用考虑其寿命问题

The service life is tens of thousands of hours, which is more than 100 times that of xenon lamp. When applied to endoscope equipment, its service life basically does not need to be considered

没有启动时间的限制，可以瞬间点亮，为检测节省时间

There is no limit on the start-up time. It can be lit instantly to save time for detection

体积小，形式多样化，更方便集成在电子内窥镜设备中

The utility model has the advantages of small volume and diversified forms, and is more convenient to be integrated in the electronic endoscope equipment

色域广，而且有更高的色彩饱和度，有助于成像逼真的画质，这对于内窥检测来说至关重要；

Wide color gamut and higher color saturation contribute to realistic image quality, which is very important for endoscopic detection;

亮度均匀，LED是一种平面状光源，组合封装后能实现较好的亮度均匀性，很好地辅助内窥镜显示技术实现均匀的画面效果。

The brightness is uniform. LED is a planar light source. After combined packaging, it can achieve good brightness uniformity, which can well assist the endoscope display technology to achieve uniform picture effect.

目前主流厂家大都采用LED光源，也有一些采用更新的激光光源技术，激光光源是利用激发态粒子在受激辐射作用下发光的相干光源，具有单色性好、方向性强、亮度高的优点，在成像领域具有一定的潜力。由于其相干的光学原理，在用于检测照明时会随机生成一些颗粒状的图案，俗称光斑或散斑，易造成检测图像失真，影响成像效果。激光光源作为一项新技术，其稳定性有待接受市场的检验，失真的问题也有待改善，因此主流厂家做得比较少。更多还是采用前面介绍的LED光源

At present, most mainstream manufacturers use LED light sources, and some use newer laser light source technology. Laser light sources are coherent light sources that use excited particles to emit light under the action of stimulated radiation. They have the advantages of good monochromaticity, strong directivity and high brightness, and have a certain potential in the field of imaging. Due to its coherent optical principle, some granular patterns, commonly known as spot or speckle, will be randomly generated when used to detect illumination, which is easy to cause detection image distortion and affect imaging effect. As a new technology, the stability of laser light source needs to be tested by the market, and the problem of distortion needs to be improved. Therefore, mainstream manufacturers do less. More or use the LED light source introduced earlier