IR Objective Lens Infrared Optics Infrared Lens IR Optics IR Lens

IR Objective Lenses

The infrared (IR) objective lens is an integral part of the infrared vision system, which is used to collect radiation in the near-infrared, short-wave infrared, mid-wave infrared, or long-wave infrared spectra, and focus the object on the detector. Information such as temperature distribution and pixel information could be captured and displayed as thermal images. This is widely used in many industrial inspection applications because its optical system can ensure good imaging quality in a wide operating temperature range, and high resolution in a wide field of view.

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ModelMagnificationF#BWDFocus TypeMountWavelength (μm)Detector
Infra-LW256-1X1x1.031mmManual FocusM45x18-14320x256, 25um
Infra-LW256-1.25X1.25x0.9831mmManual FocusM45x18-14320x256, 25um
Infra-LW256-3X3x1.031mmManual FocusM45x18-14320x256, 25um
Infra-LW256-5X5x1.031mmManual FocusM45x18-14320x256, 25um
Infra-LW640-5X5X4.4611mmManual FocusM34x0.758-14640x480, 17um
Infra-LW640-3X3X2.011mmManual FocusM34x0.758-14640x480, 17um
Infra-LW640-1X1X1.011mmManual FocusM34x0.758-14640x480, 17um
Infra-IRM1X-151x2.050mmFixed FocusM60x13-51280x1024, 15um
Infra-IRM3X-153x2.050mmFixed FocusM60x13-51280x1024, 15um
Infra-IRM8.2X-158.2x2.050mmFixed FocusM60x13-51280x1024, 15um
Infra-IRM1X1x2.040.5mmManual FocusM48x13-5640x512, 15um
Infra-IRM2X2x2.040.5mmManual FocusM48x13-5640x512, 15um
Infra-IRM5XV35x4.039.65mmManual FocusM42X0.753-5640x512, 15um

IR Objective Lens Application Note

Author: Neo – Principle Engineer

The infrared objective lens is an integral part of the infrared vision system, which is used to collect radiation in the near-infrared, short-wave infrared, mid-wave infrared, or long-wave infrared spectra (Figure 1), and focus the object onto the detector. Information such as temperature distribution and pixel information could be captured and displayed as thermal images. This is widely used in many industrial inspection applications. Its optical system can ensure good imaging quality in a wide operating temperature range and a high resolution in a wide field of view.

Figure 1. Electro-magnetic Spectrum showing Wavelength Range

Operation Principle

The imaging principle of the infrared objective lens is to use the objective lens to receive the infrared radiation energy of the measured target, and reflect it on the photosensitive element of the infrared focal plane detector according to the original spatial order distribution. The infrared detector will convert the infrared radiation energy into electrical signals. Amplified, converted, or standard video signals are displayed on the display to display infrared thermal images as shown in Figure 2.

Figure 2. Schematic diagram of thermal imaging principle

This thermal image corresponds to the thermal distribution field on the surface of the object. Through software settings, the infrared thermal imager will automatically demarcate different colors for different temperatures on the thermal image.

Infrared objectives are designed to use optical elements that are special infrared materials such as Germanium (Ge), Zinc selenide (ZnSe), Zinc sulfide (ZnS), and chalcogenide glass. The key to infrared optical systems is to reduce chromatic aberration. In order to have a good imaging quality of the system, the general chromatic aberration correction requires at least three materials with different chromatic aberration coefficients, and the materials have different chromatic dispersion coefficients in order to effectively control the secondary level spectrum, as shown in Figure 3 and Figure 4.

Figure 3. Layout of the IR Objective lens
Figure-4.-MTF-of-IR-Objective-lens-1
Figure 4. MTF of IR Objective lens

Applications

The infrared objective lens has an optical microscope magnification function and temperature measurement function, which can be applied to the non-destructive testing of microelectronic devices, temperature measurement, and positioning of tiny objects. It has been widely used in the fields of industrial equipment status detection, medical diagnosis, scientific experimental research, defence, and security.


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