Introduction to IR Lenses and IR Cameras

In the wavelength range of 0.76 to 400㎛called infrared, infrared is invisible light. All matter above perfect zero (-273.15℃) can produce infrared light. Modern physics calls it heat rays. Medical infrared can be divided into two categories: near infrared and far infrared.

The infrared camera has a low power supply and uses two types of infrared rays: near-infrared or short-wave infrared, with a wavelength of 0.76-1.5㎛, which penetrates deep into human tissue, about 5-1mm;

Far-infrared or long-wave infrared, with a wavelength of 1.5 to 400㎛, most of which is absorbed by the superficial skin, and the depth of penetration of the tissue is less than 2mm. Enhanced nighttime image capture. Therefore, most users need infrared zoom lenses to pursue powerful photo effects.

The real infrared night vision device is photomultiplier tube imaging, which is completely different from the principle of the telescope. It cannot be used during the day, and it is expensive and requires a power source to work.

The infrared cameras on the Chinese market mainly realize day-night conversion through infrared filters, that is, the filters are turned on during the day to block infrared rays from entering the CCD so that the CCD can only perceive visible light;

In the case of night vision or insufficient light, the filter stops working and no longer blocks infrared rays from entering the CCD. Infrared rays are reflected by objects and enter an infrared camera for imaging.

However, in practical applications, infrared cameras tend to have clear images during the day but become blurry under infrared light conditions.

This is because the wavelengths of visible light and infrared light (IR light) are different, and different wavelengths will result in different positions of the focal plane of the imaging, resulting in the phenomenon of virtual focus and image blur.

The IR infrared lens adopts the latest optical design methods, special optical glass materials, and advanced technologies such as special coatings and materials to eliminate the focal plane shift of visible light and infrared light.

The special optical glass material solves the problem of clear imaging corresponding to the infrared camera so that the light from the visible light region to the infrared light region is imaged at the same focal plane position to achieve a clear image.

The special coating technology allows the infrared rays to pass through as much as possible; the multi-layer coating also minimizes the occurrence of shadows and flashes under backlit conditions, allowing you to obtain vivid images with high contrast even in poor backlit conditions.

IR lenses have a wide range of applications and can be used for special purposes in infrared communication or as ordinary vortex imaging lenses. That is to say, according to different usage occasions, the infrared corresponding lens can be used flexibly with the traditional infrared camera.

Thermal imaging cameras do not have an IR cut filter, but the spectrum of sunlight also contains infrared light, so even in daylight conditions, the imaging of the thermal imaging camera will be disturbed by infrared light. Therefore, the use of infrared corresponding lenses can effectively improve imaging quality.

The infrared camera needs to determine the camera type according to the specific use environment, especially the night environment, details are as follows:

1. Investigate the installation point of the infrared thermal imager at night in the light source environment: there is light without light, dim light, or no light environment, which determines how far the infrared thermal imager will automatically open the auxiliary camera to monitor when the light source is insufficient.

2. Determine the approximate range that the infrared camera needs to see in the environment: if you want to see 30m, 50m, 80m, or 100m, you need to see the movement of the object at the farthest distance or you must see the face clearly, and the projection range can also be Same as normal light cast.

But when choosing an infrared camera, the visible range of the infrared light and the camera has been determined, and the infrared light, infrared camera, and camera have already made a set of finished effects.

Therefore, unlike ordinary cameras, the vortex zoom lens can be easily replaced to change the field of view. It should be noted that the larger the night vision lighting area, the higher the cost and the greater the energy consumption.

Therefore, users can install auxiliary infrared light sources in some important areas according to actual needs, so as to obtain better large-scale infrared lens monitoring effects for some important areas.

The above briefly introduces the infrared lens and infrared camera. If you want to buy an infrared camera, please contact us.

JAVOL is a professional custom infrared imaging equipment manufacturer. Relying on multi-spectral high-sensitivity photoelectric sensor chips based on advanced compound semiconductor materials, using deep learning AI algorithms as the engine, it integrates low-light night vision technology, infrared thermal imaging technology, short-wave or long-wave infrared Technology, Multispectral Technology In one fusion technology, our company designs, develops and manufactures advanced imaging products and system solutions, which are widely used in machine vision, autonomous driving, drone payloads, high-end manufacturing, medical diagnosis and other fields.