Hangzhou Shalom Electro-optics Technology Co., Ltd. 35mm f/0.85 Athermalized Lenses for LWIR Thermal Camera 301-021

Features: • Wide focal length range: 4.3mm to 100mm • Broad working temperature range: -40°C to 60°C • Passive optical athermalization design • Compact structure and IP67 sealing Infrared optical materials exhibit substantial changes in refractive index along with changes in temperature, this trait consequently leads to unstable focusing lengths of Infrared (IR) thermal imaging cameras, which are undesirable. Athermalization technique is often utilized in the design of IR thermal imaging to eliminate the defocus over an extended temperature range. There are three main techniques: Passive Optical Athermalization, Passive Mechanical Athermalization, and Active Electromechanical Athermalization. Passive Optical Athermalization eliminates the effect of defocus using combined different lens materials with complementing CTEs (Coefficients of Thermal Expansion) to compensate for thermal focus shift, the designed structure is simplified and involves no spacial displacement of the lenses, suitable for compact and light-weight applications. Hangzhou Shalom EO offers off-the-shelf and custom LWIR thermal camera lenses of passive optical athermalization design, with a focus range of 4.3mm to 100mm and a temperature range of -40°C to +60°C. With passive optical athermalization treatment, the lenses are compact with the absence of adadditionalptics to offset the thermal defocus, and therefore are advantageous for weight-sensitive designs.