LTCL series

Collimated (telecentric) LED illuminators

LTCL collimated illuminators have been specifically designed to back illuminate objects imaged by telecentric lenses.

This type of illumination is strongly recommended for high accuracy measurement of round or cylindrical parts where diffusive back lighting would offer poor performances.

Key advantages

  • Complete light coupling
    All the light emitted by a LTCL source is collected by a telecentric lens and transferred to the camera detector, ensuring a very high signal-to-noise ratios.
  • Border effects removal
    Diffused back-illuminators often make objects seem smaller than their actual size because of light reflections on the object sides, while collimated rays are typically much less reflected.
  • Field depth and telecentricity improvement
    Collimated illumination geometry increases a telecentric lens natural field depth and telecentricity far beyond its nominal specs.

Sample applications

Coils and springs Coils and springs Tubes and shafts Tubes and shafts
Screws and nuts Screws and nuts Seals and o-rings Seals and o-rings

 

Now available

LTCLHP LED illuminators.

Optical specs Mechanical specifications Compatible telecentric lenses Datasheet
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Part number Beam
diameter		 Working
distance
range		 Length Outer
diameter		 TC 13 yyy
yyy=		 TC 12 yyy
yyy=		 TC 23 yyy
yyy=		 TC4M yyy
yyy=		 TC2M yyy
yyy=		 TC16M yyy
yyy=		 TC12K yyy
yyy=
(*) (mm) (mm) (mm) (mm)
LTCL 023-R 16 45 ~ 90 83.6 28 n.a. n.a. 00x, 012 004, 007, 009 n.a. n.a. n.a.
LTCL 023-G 16 45 ~ 90 83.6 28 n.a. n.a. 00x, 012 004, 007, 009 n.a. n.a. n.a.
LTCL 023-B 16 45 ~ 90 83.6 28 n.a. n.a. 00x, 012 004, 007, 009 n.a. n.a. n.a.
LTCL 023-W 16 45 ~ 90 83.6 28 n.a. n.a. 00x, 012 004, 007, 009 n.a. n.a. n.a.
LTCL 016-R 20 35 ~ 70 86.7 38 n.a. 016 016 016 016 n.a. n.a.
LTCL 016-G 20 35 ~ 70 86.7 38 n.a. 016 016 016 016 n.a. n.a.
LTCL 016-B 20 35 ~ 70 86.7 38 n.a. 016 016 016 016 n.a. n.a.
LTCL 016-W 20 35 ~ 70 86.7 38 n.a. 016 016 016 016 n.a. n.a.
LTCL 024-R 30 45 ~ 90 115.5 44 n.a. 024 024 024 024 009, 012, 018 n.a.
LTCL 024-G 30 45 ~ 90 115.5 44 n.a. 024 024 024 024 009, 012, 018 n.a.
LTCL 024-B 30 45 ~ 90 115.5 44 n.a. 024 024 024 024 009, 012, 018 n.a.
LTCL 024-W 30 45 ~ 90 115.5 44 n.a. 024 024 024 024 009, 012, 018 n.a.
LTCL 036-R 45 70 ~ 140 138.9 61 036 036 036 036 036 036 n.a.
LTCL 036-G 45 70 ~ 140 138.9 61 036 036 036 036 036 036 n.a.
LTCL 036-B 45 70 ~ 140 138.9 61 036 036 036 036 036 036 n.a.
LTCL 036-W 45 70 ~ 140 138.9 61 036 036 036 036 036 036 n.a.
LTCL 048-R 60 90 ~ 180 174.0 75 n.a. 048 048 048 048 048 n.a.
LTCL 048-G 60 90 ~ 180 174.0 75 n.a. 048 048 048 048 048 n.a.
LTCL 048-B 60 90 ~ 180 174.0 75 n.a. 048 048 048 048 048 n.a.
LTCL 048-W 60 90 ~ 180 174.0 75 n.a. 048 048 048 048 048 n.a.
LTCL 056-R 70 100 ~ 200 197.3 80 n.a. 056 056 056 056 056 n.a.
LTCL 056-G 70 100 ~ 200 197.3 80 n.a. 056 056 056 056 056 n.a.
LTCL 056-B 70 100 ~ 200 197.3 80 n.a. 056 056 056 056 056 n.a.
LTCL 056-W 70 100 ~ 200 197.3 80 n.a. 056 056 056 056 056 n.a.
LTCL 064-R 80 120 ~ 240 218.4 100 064 064 064 064 064 064 064
LTCL 064-G 80 120 ~ 240 218.4 100 064 064 064 064 064 064 064
LTCL 064-B 80 120 ~ 240 218.4 100 064 064 064 064 064 064 064
LTCL 064-W 80 120 ~ 240 218.4 100 064 064 064 064 064 064 064
LTCL 080-R 100 150 ~ 300 264.0 116 n.a. 080 072, 080 072, 080 080 080 080
LTCL 080-G 100 150 ~ 300 264.0 116 n.a. 080 072, 080 072, 080 080 080 080
LTCL 080-B 100 150 ~ 300 264.0 116 n.a. 080 072, 080 072, 080 080 080 080
LTCL 080-W 100 150 ~ 300 264.0 116 n.a. 080 072, 080 072, 080 080 080 080
LTCL 096-R 120 200 ~ 250 309,0 143 096 096 085, 096 085, 096 096 096 n.a.
LTCL 096-G 120 200 ~ 250 309,0 143 096 096 085, 096 085, 096 096 096 n.a.
LTCL 096-B 120 200 ~ 250 309,0 143 096 096 085, 096 085, 096 096 096 n.a.
LTCL 096-W 120 200 ~ 250 309,0 143 096 096 085, 096 085, 096 096 096 n.a.
LTCL 120-R 150 220 ~ 440 395.0 180 n.a. 120 110, 120 110, 120 120 120 120
LTCL 120-G 150 220 ~ 440 395.0 180 n.a. 120 110, 120 110, 120 120 120 120
LTCL 120-W 150 220 ~ 440 395.0 180 n.a. 120 110, 120 110, 120 120 120 120
LTCL 144-R 180 270 ~ 540 454.0 200 n.a. 144 130, 144 130, 144 144 144 144
LTCL 144-G 180 270 ~ 540 454.0 200 n.a. 144 130, 144 130, 144 144 144 144
LTCL 192-R 250 350 ~ 700 595.0 260 n.a. 192 172, 192 172, 192 192 n.a. 192
LTCL 192-G 250 350 ~ 700 595.0 260 n.a. 192 172, 192 172, 192 192 n.a. 192
LTCL 192-W 250 350 ~ 700 595.0 260 n.a. 192 172, 192 172, 192 192 n.a. 192
LTCL 240-R 300 350 ~ 700 756.0 322 n.a. n.a. 200, 240 200, 240 n.a. n.a. n.a.
LTCL 240-G 300 350 ~ 700 756.0 322 n.a. n.a. 200, 240 200, 240 n.a. n.a. n.a.

Notes

* The last letter of the part number defines the source color:

R = red, peak at 630 nm
G = green, peak at 520 nm
B = blue, peak at 460 nm
W = white

Refer to the Tech info section for more info.

LTCL 023-R
LTCL 023-G
LTCL 023-B
LTCL 023-W
LTCL 016-R
LTCL 016-G
LTCL 016-B
LTCL 016-W
LTCL 024-R
LTCL 024-G
LTCL 024-B
LTCL 024-W
LTCL 036-R
LTCL 036-G
LTCL 036-B
LTCL 036-W
LTCL 048-R
LTCL 048-G
LTCL 048-B
LTCL 048-W
LTCL 056-R
LTCL 056-G
LTCL 056-B
LTCL 056-W
LTCL 064-R
LTCL 064-G
LTCL 064-B
LTCL 064-W
LTCL 080-R
LTCL 080-G
LTCL 080-B
LTCL 080-W
LTCL 096-R
LTCL 096-G
LTCL 096-B
LTCL 096-W
LTCL 120-R
LTCL 120-G
LTCL 120-W
LTCL 144-R
LTCL 144-G
LTCL 192-R
LTCL 192-G
LTCL 192-W
LTCL 240-R
LTCL 240-G

Videos

 

OTHER VIDEOS

Find more videos on our Vimeo channel

Product images

Find more pages on our Flickr page

Technical documents

Product user guide PDF
Telecentric lenses tutorial PDF
OE Bi-Telecentric technology PDF
Back focal length adjustment PDF

Press & marketing content

Telecentric lenses brochure PDF
Opto Engineering 2014 catalog PDF
Caps inspection and measurement PDF
Telecentric applications PDF
Bi-TC tech for accurate measurement PDF

Layout files

LTCL 023-R
LTCL 023-G
LTCL 023-B
LTCL 023-W
LTCL 016-R
LTCL 016-G
LTCL 016-B
LTCL 016-W
LTCL 024-R
LTCL 024-G
LTCL 024-B
LTCL 024-W
LTCL 036-R
LTCL 036-G
LTCL 036-B
LTCL 036-W
LTCL 048-R
LTCL 048-G
LTCL 048-B
LTCL 048-W
LTCL 056-R
LTCL 056-G
LTCL 056-B
LTCL 056-W
LTCL 064-R
LTCL 064-G
LTCL 064-B
LTCL 064-W
LTCL 080-R
LTCL 080-G
LTCL 080-B
LTCL 080-W
LTCL 096-R
LTCL 096-G
LTCL 096-B
LTCL 096-W
LTCL 120-R
LTCL 120-G
LTCL 120-W
LTCL 144-R
LTCL 144-G
LTCL 192-R
LTCL 192-G
LTCL 192-W
LTCL 240-R
LTCL 240-G

Please contact us if you have questions or need more information.

Compatible products

TC series

Bi-telecentric lenses for matrix detectors up to 2/3″

TC2M and TC4M series

Bi-telecentric lenses for large detectors

TC16M series

Bi-telecentric lenses for very large detectors

TC12K series

Telecentric lenses for 12k and 16kpx line scan cameras

CMHO series

Clamping mechanics

See also

TCBENCH series

Tools and resources

Telecentric lenses tutorial
TC options
TC accuracy chart
Image gallery
Video gallery
Frequently asked questions
Device power ratings LED power ratings
Part number Light color, peak wavelength Min DC voltage Max DC voltage Power consumption Forward voltage Forward current Max pulse current @10% duty cycle/1kHz
(V) (V) (W) (V) (mA) (mA)
-R type red, 630 nm 12 24 < 2 2,5 300 < 1800
-G type green, 520 nm 12 24 < 2 3,5 350 < 1800
-B type blue, 460 nm 12 24 < 2 3,5 350 < 1800
-W type white 12 24 < 2 3,5 350 < 1800

 

Typical emission spectrum of white

Emission spectrum of white LEDs

Typical emission spectrum of RGB LEDs

Emission spectrum of RGB LEDs

Available colors

R = red, peak at 630 nm
G = green, peak at 520 nm
B = blue, peak at 460 nm
W = white

For example the part number “LTCL 064-G” defines a LTCL 064 type collimated source equipped with green (-G) LEDs.

Green light is recommended for high precision measurement applications: ensuring the lowest distortion and the highest telecentricity, also delivering the highest signal/noise ratio and the best image resolution.

Easy and precise alignment with bi-telecentric lenses

Every collimated source up to LTCL 144-X can be mounted on the same clamping mechanics (CMHO series) used to fix and align our telecentric lenses.
You can create the perfect optical bench for any precision measurement application by interfacing our bi-telecentric lenses and LTCL collimated illuminators with these precision clamps.

Built-in electronics

You can easily adjust the light intensity of any LTCL illuminator thanks to the built-in electronics board, which ensures a constant current flow through the LED source. This delivers excellent illumination stability and increases the product lifetime.
To do so, just connect the black and brown cables to your 12/24V power supply.

Direct LED control

The inner circuitry can be bypassed in order to drive the LED directly for use in continuous or pulsed mode. To do so, simply connect the black and blue cables to your power supply or external strobe controller.
Make sure that the maximum rates are not exceeded to avoid electrical shorts.