Optics Design Services
Thermal Lens Design
WHAT IS THERMAL LENS
How We Can Help
THE LONG WAVE INFRARED (LWIR) THERMAL IMAGING CAMERA OBJECTIVES ARE BUILT-IN LENS SETS DESIGNED TO CORRESPOND TO UNCOOLED INFRARED DETECTORS/SENSORS OPERATING AT 8-12 MICROWAVELENGTHS. COMPARED TO MWIR THERMAL LENSES, LWIR LENSES HAVE DISTINCTIVE CHARACTERISTICS OF BEING INDEPENDENT OF THE ADDITIONAL HEAT SOURCE AND ARE MORE AFFORDABLE.
A SET OF LWIR LENS MODULES, FOR THE MOST PART, IS CONSTITUTED FROM MULTIPLE (>2) SINGLE IR LENSES OF DIFFERENT SURFACE PROFILES (E.G. DIFFRACTIVE LENS, ASPHERIC LENS) OR VARIOUS LWIR-TRANSMITTING MATERIALS (E.G GE, ZNSE, CHALCOGENIDES, ETC.) WITH COMPLEMENTING OPTICAL PROPERTIES TO COMPENSATE THE SPHERICAL AND CHROMATIC ABERRATIONS AND OPTIMIZE FOR THE IMAGE QUALITY. WITH EXCELLENT DETECTION, RECOGNITION, AND IDENTIFICATION (DRI) CAPABILITIES, THE LENS ASSEMBLIES MEET THE SPECIFIC REQUIREMENTS FOR A WIDE RANGE OF INDUSTRIAL, MEDICAL, COMMERCIAL, DEFENSE, AND HOMELAND SECURITY APPLICATIONS.
INET OFFERS OFF-THE-SHELF THERMAL CAMERA LENSES AND CUSTOM LENS MODULES, INET UTILIZES A WIDE ASSORTMENT OF MATERIALS INCLUDING GERMANIUM, ZINC SELENIDE, CHALCOGENIDES, ZNS, AND GALLIUM ARSENIDE(GAAS), ETC. AS LWIR LENS SUBSTRATES, FURNISHED WITH ANTI-REFLECTION (AR) COATINGS OR DIAMOND-LIKE CARBON(DLC) COATINGS ON THE LENS FRONT. THE LWIR THERMAL LENSES ARE CATEGORIZED INTO SIX CLASSIFICATIONS: ATHERMALIZED LENSES EXHIBIT HIGH RESISTANCE TO TEMPERATURE FLUCTUATIONS THUS SHRINKING THE POSSIBILITY OF DEFOCUS AT UNSTABLE TEMPERATURES, SUPER WIDE ANGLE AND FISHEYE LENSES PROVIDE BROAD FIELDS OF VIEW. SINGLE FOV LENSES ARE ENDOWED WITH A CERTAIN DESIGNATED FOCAL LENGTH EACH, GENERATING A PARTICULAR FOV, WHILE DUAL FOV LENSES HAVE TWO SWITCHABLE FOCAL LENGTHS EACH AND HENCE A DOUBLE FOV. THE ZOOM LENSES HAVE CONTINUOUS VARIABLE FOCAL LENGTHS, ALLOWING FLEXIBLE OBSERVATION OVER A WIDE RANGE OF DISTANCES AND REAL-TIME DETECTION.
VERSATILE AND FLEXIBLE AND WITH THE WIDEST RANGE OF ELEMENTS AND MATERIALS FOR ALL KINDS OF APPLICATIONS.
WHEN WE START CUSTOMIZED THERMAL LENS WE WILL FOLLOW THE PROCESS AS BELOW.
After receiving the design requirements, verify the feasibility of customization and make a professional suggestions.
After confirmation, design and development of the optical component will take place. Samples will be provided and we will give all needed support.
STRUCTRE & SCHEME
Determine the structural size of lens or other component according to the client request.
After the production is completed , each product will undergo quality insperction and then packging for shipment.
We will provide a quotation according to the design includes mass production, samples price and NRE cost.
We will track the goods throughout the process and will deliver it door to door, while taking care of all relevant custom documents, PI and CI.
Selecting your lens
Selecting the correct Thermal lens is necessary to obtain high quality image for a correct and efficient following processing.
Though the result also depends on the sensor resolution and pixel size, a lens is in many cases the stepping stone to build a thermal vision system.
Field of View (FoV): total area that can be viewed by the lens and imaged onto the camera sensor.
Working distance (WD): object to lens distance where the image is at its sharpest focus.
Depth of Field (DoF): maximum range where the object appears to be in acceptable focus. Sensor size: size of the camera sensor’s active area. This can be easily calculated by multiplying the pixel size by the sensor resolution (number of active pixels in the x and y direction).
Magnification: ratio between sensor size and FoV.
Resolution: minimum distance between two points that can still be distinguished as separate points. Resolution is a complex parameter, which depends primarily on the lens and camera resolution.