1. Lighting conditions. Most of the endoscopes are illuminated by the light source of the endoscope. Under general conditions, it is required that the color temperature of the light source detected by the endoscope shall not be lower than 5600k, and the illumination intensity shall not be lower than 2600lm. Weile video endoscope comes with 12 super bright LED light source.

2.探头位置与角度。通常在距离检测区域5~25mm范围内观察图像的效果最好，因此往往需要内窥镜探头尽量靠近观测点。探头与观测物平面在45°~90°范围内都可以达到较好的观测效果，在实际工作中是通过反复改变探头与观察点的位置与角度找到合适的观察位置，并获得最佳的检测效果。

2. Probe position and angle. Generally, the best effect is to observe the image in the range of 5-25 mm from the detection area, so the endoscopic probe is often required to be as close to the observation point as possible. Both the probe and the observation plane can achieve better observation effect in the range of 45 ° ~ 90 °. In the actual work, it is through changing the position and angle of the probe and the observation point repeatedly to find the appropriate observation position and obtain the best detection effect.

3.通道。选择通道时应尽量靠近需要检测位置，选择进入长度最短的通道，尽量减少探头需要弯曲的次数及程度；首先考虑由上到下，由高到低的通道；优先选择宽阔的通道；推荐使用工装，保证探头在产品通道中的正确方向；应采用边观察边通过的方法在通道中行进。

3. Access. When selecting the channel, try to be close to the position to be detected, select the channel with the shortest length to enter, and try to reduce the number and degree of the probe to be bent; first, consider the channel from top to bottom, from high to low; give priority to the wide channel; recommend the use of tooling to ensure the correct direction of the probe in the product channel; adopt the method of observing and passing in the channel.

4.图像的畸变。通过透镜观察物体产生的变形现象，随着从透镜中心到边缘距离的增大，图像发生畸变。图像的畸变会对缺陷的判断及测量产生影响。直杆镜、光纤镜观察是图像的畸变较大，视频内窥镜可通过计算机进行校正。

4. Image distortion. The deformation phenomenon of the object is observed through the lens. With the increase of the distance from the center to the edge of the lens, the image is distorted. The distortion of image will affect the judgment and measurement of defects. The distortion of the image observed by the straight rod mirror and the optical fiber mirror is large, and the video endoscope can be corrected by the computer.

5.分辨率、放大倍数、可检测最小缺陷。这些都是内窥镜自身的技术指标，可直接影响到探测的结果。

5. Resolution, magnification, and detectable minimum defects. These are the technical indicators of endoscope itself, which can directly affect the detection results.

6.物体表面的反射率。不同的物体表面有不同的反射率，和物体的材料和表面的粗糙程度都有关系。因此，实际检测时应该根据具体的情况选择内窥镜照明的强度以便得到清晰有用的结果。

6. Reflectivity of the object surface. Different surfaces have different reflectivity, which is related to the material and roughness of the surface. Therefore, in order to get clear and useful results, the intensity of endoscopic illumination should be selected according to the actual situation.

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