Infrared and night vision pixel by pixel optical fusion system
Infrared and night vision optical fusion systems are provided. The first scheme is to add a common-aperture beam splitter in front of the night vision device, which is a band-pass filter having a high transmission for the light with wavelength of 0.78-1 μm, and a high reflectivity for the visible light with wavelength of 0.38-0.78 μm and for the infrared light with wavelength of 8-14 μm. After electrical processing, a target image with a temperature higher or lower than a certain threshold is obtained on the LCD/OLED. The second scheme is to align the night vision objective lens and the infrared objective lens having the same field of view side by side. Since only infrared targets having a temperature above or below a certain threshold are used, white or red humans, animals and vehicles can be clearly seen in a green night vision background with high contrast no matter which scheme is adopted.
1. An infrared and night vision pixel by pixel optical fusion system, comprising:
an infrared thermal imager;
a night vision device; and
a common-aperture beam splitter, placed in front of the night vision device, which is a band-pass filter having a high transmission for a night vision light sensitive to the night vision device, and a high reflectivity for a visible light and for an infrared light;
wherein lights emitted by a target object comprise the infrared light and the night vision light;
wherein after electrical processing, a target image with a temperature higher or lower than a certain threshold is obtained on an LCD display or an OLED display;
wherein the infrared image on the LCD/OLED display converted into the visible light is projected onto the back surface of the beam splitter by the relay lens, and after the projected target image together with the night vision light from the same target object enter the night vision system, a pixel by pixel fusion is performed in order to form an image on a retina.
2. The infrared and night vision pixel by pixel optical fusion system according to claim 1 , wherein the common-aperture beam splitter is a band-pass filter having a high transmission for the night vision light with a wavelength of 0.78-1 μm sensitive to the night vision device, and a high reflectivity for the visible light with a wavelength of 0.38-0.78 μm and for the infrared light with a wavelength of 8-14 μm.
3. The infrared and night vision pixel by pixel optical fusion system according to claim 1 , wherein the common-aperture beam splitter is used for reflecting the visible light and the infrared light to an infrared imaging channel, and the optical fusion system further comprises a long-pass filter used for filtering out the visible light for imaging the infrared to a focal plane array detector.
4. The infrared and night vision pixel by pixel optical fusion system according to claim 1 , wherein the infrared light and the night vision light have the same field of view, and it's ensured that the same target with the same size is seen through a light bar and a beam splitter, such that a pixel by pixel fusion is performed.
5. The infrared and night vision pixel by pixel optical fusion system according to claim 1 , wherein only infrared targets having a temperature above or below a certain threshold are reserved for performing a pixel by pixel fusion with the night vision light.