Telecentric lenses and optical systems for imaging, sensors, metrology, lighting and lasers.

Telecentric lenses and optical systems for imaging, sensors, metrology, lighting and lasers.

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TCUV SERIES: ULTRA-HIGH IMAGE RESOLUTION, ACCURACY AND FIELD DEPTH

Opto Engineering TC UV Series Telecentric Lenses are specifically designed to ensure the highest image resolution today available in the machine vision world.
No other lenses in the market can efficiently operate with pixels as small as 2 micron; for this reason TC UV Telecentric Lenses are a MUST for all those using high resolution cameras and seeking for the highest possible system accuracy.
Common lenses and traditional telecentric lenses operate in the visible light range. The limiting resolution of a lens is given by the cut-off frequency, the spatial frequency at which the lens is no longer able to yield sufficient image contrast information. As the cut-off frequency is inversely proportional to the light wavelength, common telecentric optics are useless with very small pixel sizes (such as 1.75 micron) which are becoming increasingly popular among industrial cameras. TC UV telecentric Lenses operate in the 365/425 nm range and deliver much higher image contrast at high spatial frequencies, being therefore compatible with the tiniest pixel sizes. On the other hand, when used in combination with normal cameras, the resolution of these lenses is so high that they can cope with much larger object displacements (higher field depths) than VIS lenses before any image defocusing becomes evident.

 

Graph of two telecentric lenses operating at working F-number 8The graph on the left shows the limiting performances (diffraction limit) of two lenses operating at working F-number 8.

The VIS lens operates at 587 nm (green ligth) while the UV lens operates at 365 nm.

The MTF function, which expresses the contrast ratio, is much larger at high spatial frequencies in the UV than in the VIS range.

The vertical bars show the cut-off frequencies of both lenses: at 340 lp/mm, contrast yield by TCUV Lenses is still significant and pixels as small as 1.5 micron can bear useful image information.

 

Graph that shows the resolution specifications of UV telecentric lensesThe graph shows the resolution specifications of TC UV lenses.

In addition to the MTF diffraction limit, both the MTF curve of TC UV lenses and the CTF (Contrast Transfer Function) curve are displayed.

MTF curve refers to the response of the lens to a sinusoidal pattern, while the CTF function expresses the contrast the lens is yielding when a "square wave" pattern made of black and white stripes is imaged.


If w is the spatial frequency and p is the pixel size, then a pixel whose size is p = 1/2w will yield a contrast given by the CTF at the spatial frequency w.

 

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Detector Type Optical Specifications Dimensions
1/4'' 1/3'' 1/2'' 1/1.8'' 2/3''   Datasheet
& Drawing
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Quotation
Part Number magn. w x h w x h w x h w x h w x h W.D. Field F/N CTF@ Telecentricity Distortion Mount Length Diam
(3.6 x 2.7) (4.8 x 3.6) (6.4 x 4.8) (7.13 x 5.37) (8.8 x 6.6) Depth 70 lp/mm
(7) (1) (3) (2) (4) (5)
(X) (mm x mm) (mm x mm) (mm x mm) (mm x mm) (mm x mm) (mm) (mm) (%) deg. % (mm) (mm)
 
Object Field of View (mm x mm) (6)
TCUV1236 0.175 20.5 x 15.4 27.4 x 20.5 36.5 x 27.4 40.6 x 30.6 diam. = 37.6 98.7 21.0 8 > 40 < 0.1 < 0.08 C 142.3 61.0   TCUV1236  
TCUV2336 0.241 14.9 x 11.2 19.9 x 14.9 26.6 x 19.9 29.6 x 22.3 36.5 x 27.4 98.7 11.0 8 > 40 < 0.1 < 0.08 C 160.4 61.0   TCUV2336  
TCUV1248 0.133 27.0 x 20.2 36.0 x 27.0 47.9 x 36.0 53.4 x 40.2 diam. = 49.4 130.7 37.0 8 > 40 < 0.08 < 0.08 C 176.1 75.0   TCUV1248  
TCUV2348 0.183 19.6 x 14.7 26.2 x 19.6 34.9 x 26.2 38.9 x 29.3 48.0 x 36.0 130.7 20.0 8 > 40 < 0.08 < 0.08 C 160.4 75.0   TCUV2348  
TCUV1256 0.114 31.5 x 23.6 42.0 x 31.5 56.1 x 42.0 62.4 x 47.0 diam. = 57.8 154.0 51.0 8 > 40 < 0.1 < 0.08 C 198.4 80.0   TCUV1256  
TCUV2356 0.157 22.9 x 17.2 30.6 x 22.9 40.8 x 30.6 45.4 x 34.2 56.1 x 42.1 154.0 27.0 8 > 40 < 0.1 < 0.08 C 160.4 80.0   TCUV2356  
TCUV1264 0.100 36.0 x 27.0 48.0 x 36.0 64.0 x 48.0 71.3 x 53.7 diam. = 66 176.0 66.0 8 > 40 < 0.08 < 0.08 C 219.7 100.0   TCUV1264  
TCUV2364 0.137 26.2 x 19.7 34.9 x 26.2 46.6 x 34.9 51.9 x 39.1 64.1 x 48.0 176.0 35.0 8 > 40 < 0.08 < 0.08 C 160.4 100.0   TCUV2364  
TCUV1280 0.080 44.8 x 33.6 59.8 x 44.8 79.7 x 59.8 88.8 x 66.9 diam. = 82.2 221.0 102.0 8 > 40 < 0.08 < 0.08 C 264.3 116.0   TCUV1280  
TCUV2380 0.110 32.6 x 24.4 43.5 x 32.6 58.0 x 43.5 64.5 x 48.6 79.7 x 59.8 221.0 54.0 8 > 40 < 0.08 < 0.08 C 160.4 116.0   TCUV2380  

Notes
(1) Working Distance: distance between the front lens and the object. Set this distance within +/- 3% of the nominal value to optimize distortion and resolution
(2) Working F-number: the real F-number of a lens when used as a macro. Lenses with smaller apertures can be supplied on request
(3) At the borders of the field depth, the image can be still used for measurement, but to get a very sharp image consider half the field depth
(4) Maximum slope of principal rays inside the lens: converted in milliradian, it gives the maximum measurement error for any millimiter of object displacement
(5) Measured from the end of the mechanics to the camera flange
(6) For the fields with the indication "diam. =" the image of a circular object is inscribed inside the short side of the detector
(7)The 1/1.8" FOV for TC 12 XX type lenses can show some vignetting at the image corners, as the lens is optimized for 1/2" detector

 

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