It has extremely low thermal expansion coefficient, extremely high temperature resistance, excellent chemical stability, excellent electrical insulation, low and stable ultrasonic delay performance, best ultraviolet spectrum transmission performance, and visible light and near infrared spectrum transmission performance. , and has higher mechanical properties than ordinary glass. Optical glass has excellent spectral characteristics. It transmits both infrared and ultraviolet light. It can be applied to high bay lights, street lights, spotlights, industrial and mining lights.
Optical glass :
1. Material: Optical glass (high borosilicate, K9, BK7, BK270)
2. Light transmission: 95% (97% after coating)
3. Refractive index: 1.474
4. Operating temperature: -50-500 degrees
Dia.=diameter ; Do= Inside diameter ; FL= focal length
BFL= Back of focus ; CT= Center Thickness ; ET = Edge Thickness
Mining Light Glass Lenses Datasheet :
Surface profile:
While in principle aspheric surfaces can take a wide variety of forms, aspheric lenses are often designed with surfaces of the form
where the optic axis is presumed to lie in the z direction, and z(r) is the sag—the z-component of the displacement of the surface from the vertex, at distance r from the axis. The coefficients alpha;describe the deviation of the surface from the axially symmetric quadric surface specified by R and kappa . If the coefficients alpha are all zero, then R is the radius of curvature and kappa is the conic constant, as measured at the vertex (where r=0). In this case, the surface has the form of a conic section rotated about the optic axis, with form determined by kappa :
The above equation suffers from strong correlation between the coefficients of the first term and the polynomial terms. This leads to strong divergences when it comes to fitting the equation to an aspheric surface. Therefore, different equations using "Q-polynomials" where coefficients are orthogonal to each other are an alternative that is sometimes used.
