When purchasing or using a piece of equipment, it is best to first understand the working principle, so that you can know which parameters or technical indicators are important, and then you can be handy during use and be able to troubleshoot in a targeted manner when a malfunction or problem occurs. The same is true for borescope inspection equipment. Understanding the working principle of borescope video camera is the first prerequisite for buying good borescope products or correctly operating it.
Overview of the working principle of borescope inspection equipment
Transmitting the internal image of the equipment to the outside for inspection by workers is the main working mechanism of borescope inspection equipment. The core lies in: how to transmit the internal image of the device and how the inspection personnel view it. This involves different types of borescope video camera products, so the following will introduce their working principles from the three types of products: rigid tube borescope, fiber optic borescope, and electronic borescope snake camera.
Working principle of rigid tube borescope
Rigid borescope (also called rigid tube borescope) is mainly composed of optical imaging systems and lighting systems. The illumination system transmits the light from the light source to the front end of the endoscope through the optical fiber to illuminate the object being detected: the optical imaging system is a straight tube from the outside and contains a series of lenses. Its function is to image the object being detected through the optical system. On the retina of the workers, it goes through several processes: the object to be inspected is first imaged by the objective lens, and then transmitted to the eyepiece through other lenses in the working mirror tube. The workerss can view the status of the object being inspected.
The principles we introduce here are very basic. In fact, the structure is much more complicated. For example: if the viewing angle is not 0° (direct viewing), but side viewing and other situations, then a rotation image needs to be placed in the objective lens group.
Working principle of fiber optic borescope
Fiber optic borescope is similar to rigid tube borescope. The difference is that rigid tube borescope transmit images through lenses, while fiber optic endoscopes transmit images through an image-transmitting optical fiber bundle. Because the optical fiber is elastic, it can be in a curved working state (the detection path of the light endoscope can be curved). The specific working principle is as follows: the illumination light is transmitted to the end of the optical fiber lens (apex part) through the guided beam and illuminates on the surface of the object to be detected, and the reflected light (i.e., imaging light) is transmitted to the eyepiece end through the image-transmitting optical fiber bundle, and the detection personnel can see the image of the inspected object through the eyepiece.
Viewed independently, each guide fiber transmits its own image independently. On the whole, a cluster of guide fiber bundles jointly completes the image transmission task, that is to say, a complete image is transmitted in the form of a large number of light spots. Optical imaging, therefore, the fiberscope image is textured. This is also different from rigid borescope video camera, which are determined by the working method of optical fiber imaging, but it also brings the advantage of flexibility. Excellent fiber borescope video camera often rely on advanced ultra-fine optical fiber and fiber bundle technology to provide high-quality images.
Working principle of electronic borescope snake camera
The working principle of borescope snake camera (also called borescope sewer inspection camera) is relatively easy to understand and is similar to the cameras we use every day. Industrial video snake camera mainly include: probe, LCD display, operating handle, host and other components. Nowadays, most of them adopt integrated design, all integrated on the handheld machine. When carrying out inspection work: the probe enters the inspection environment, the front end of the probe emits illumination light to illuminate the surface of the object being inspected, and the CCD built in the probe (same principle as a camera) receives the reflected light from the object being inspected, converts the light into electrical signals, and then It is transmitted to the host control system through a cable and finally displayed on the screen, so the inspector can see the color image of the inspected object in real time.
Because borescope snake camera carry out photoelectric conversion, they are not optical devices but electronic devices. They facilitate digital processing and storage of images. These bring great convenience to inspection work and are superior to fiber optic scopes and straight rod scopes. .
The working principle of borescope inspection equipment is still relatively complicated. In addition, there are pipeline borescope, weld inspection borescope camera, engines borescope, etc. There are some differences in their working methods, but the principles are basically the same as those introduced above. If you are interested, you can browse the relevant pages of this website to learn about the various Endosc inspection cameras products and at the same time have a more intuitive and progressive understanding of their working principles.
