No.
Term name
English name
definition
symbol
Permissible synonyms
Synonyms of disuse
2.4.1
Received base
As received basis
The status of coal has been received as a benchmark
Ar
Â
Application base
2.4.2
Air drying base
Air based
Coal with air humidity reaching equilibrium
Ad
Â
Analytical base
2.4.3
Dry base
Dry basis
In the hypothetical state of coal without water
d
Â
Dry basis
2.4.4
Dry ash-free base
Dry ash-free basis
Based on hypothetical anhydrous, ashless coal
Daf
Â
Combustible
2.4.5
Dry mineral free base
Dry mineralmatter free basis
A hypothetical anhydrous, non-mineral state coal
Dmmf
Â
Organic base
2.4.6
Constant humidity ashless
Moist ashfree basis
A hypothetical coal containing the highest internal moisture and no ash
Maf
Â
　
2.4.7
Constant humidity and no mineral base
Moist mineral matter-free-baisis
Based on the hypothetical coal with the highest internal moisture and no mineral status
M,mmf
Â
Cylindrical lenses have at least one surface that is formed like a portion of a cylinder.Cylindrical lenses are used to correct astigmatism in the eye and in rangefinders, to produce astigmatism,stretching a point of light into a line.They are available in either plano-concave or plano-convex configurations. Plano-Concave Cylindrical lenses have a negative focal length and are used for image reduction or to spread light. Plano-Convex Cylindrical lenses have a positive focal length, which makes them ideal for collecting and focusing light for many imaging applications.
Some styles of cylindrical lenses have antireflective coatings to increase the transmission of light through the lens. Fused silica cylinder lenses are ideal for demanding laser machining and medical applications.
Plano-convex cylinder lens,Plano-Concave Cylinder Lens,Double-Convex Cylinder Lens,bi-concave cylinder lens,Meniscus Cylinder Lens, Rod Cylinder Lens ,Achromatic cylinder lens are available.
Specification of our cylinderical lens as follow:
*Material: BK7,Ge,UV-grade fuse silica(JGS1,JGS2,JGS3)or other optical materials
*Dimension Tolerance: +0.0 -- -0.1mm
*Center Thickness: +/-0.1mm
*Focal Length Tolerance: +/-1%
*Surface Quality:20/10
*Surface Figure: lambda/2 at 633nm on plano side
*Clear Aperture>90%
*Chamfer: 0.25mm at 45 degree typical
*Coating Optional
Double Convex Lens,Bi-Concave Irregular Cylindrical Lens,Double-Concave Cylindrical Lens,Dcv Cylindrical Lens
China Star Optics Technology Co.,Ltd. , https://www.csoptlens.com