LTPRSMHP3W series are LED pattern projectors specifically designed for the most demanding 3D profiling and measurement applications. Triangulation techniques require that structured light is directed onto a sample at a considerable angle from vertical. Tilting the light source pattern becomes essential to ensure that the patterned light is properly focused across the entire sample surface.

LTPRSMHP3W pattern projectors integrate a precision tilting mechanism based on the Scheimpflug condition. This ensures that focus is maintained across the entire part, and reconstruction of the 3d surface is as accurate as possible. Moreover, the internal focus mechanism offers the maximum optical throughput.

KEY ADVANTAGES

Scheimpflug tilt adjustment compatible with C-mount optics
Focus is maintained even when the pattern is tilted.
Light condenser focusing mechanism
For excellent optical coupling and light throughput.
Enhanced optical power
High numerical aperture condenser lens.

LED PATTERN PROJECTORS

LTPRSMHP3W LED pattern projector green light

		Device power ratings				LED power ratings
Part number	Light color, Wavelength peak	DC voltage 1		Power consumption	Max LED forward current	Forward voltage		Max pulse current
		Minimum	Maximum			Typical	Maximum
		(V)	(V)	(W)	(mA)	(V)	(V)	(mA)
					2	3, 4		5
LTPRSMHP3W-R3D LED pattern projector 3W, HP, red	red, 630 nm	12	24	< 4.5	720	2.4	3.00	2000	Info
LTPRSMHP3W-G3D LED pattern projector, 3W, HP, green	green, 520 nm	12	24	< 4.5	720	3.3	4.00	2000	Info
LTPRSMHP3W-B3D LED pattern projector, 3W, HP, blue	blue, 460 nm	12	24	< 4.5	720	3.3	4.00	2000	Info
LTPRSMHP3W-W3D LED pattern projector, 3W, HP, white	white	12	24	< 4.5	720	2.78	-	2000	Info

Last update: 2021-06-22

Notes

Tolerance ±10%
Used in continuous (not pulsed) mode.
At max forward current.
Tolerance is ±0.06V on forward voltage measurements.
At pulse width <= 10 ms, duty cycle <= 10% condition. Built-in electronics board must be bypassed (see tech info online).

Technical documents

Data table (Last update: :2021-06-22)

XLS

Product user guide

LTPRSM pattern positioning

Safety warning UV/IR

Compatible products

TC telecentric lens for matrix detectors

TC series

Bi-telecentric lenses for sensors up to 2/3”

MC macro lens with superior optical performances

MC series

Zero distortion macro lenses for sensors up to 2/3”

PTPR series

Projection patterns for LED projectors

Tools and resources

Examples of setup applications

Scheimpflug telecentric optics for both projection and imaging at 90°.

LTPRSM pattern projector with a standard C-mount.

Configuration with bi-telecentric lenses.

Configuration with zero distorsion macro lenses.

Without tilt adjustment the pattern features are only partly focused.

With the Scheimpflug adjustment focus is maintained across the entire plane.

LTPRHP3W Electrical features

These LED devices integrate built-in switching electronics that control the current flow through the LED and which can be easily tuned by the user. This ensures both high light stability and a longer lifetime of the product.

The inner circuitry can be bypassed in order to directly drive the LED. Simply connect the black and blue wires to your power supply instead of the black and brown ones, ensuring that the maximum rates are not exceeded.

Typical emission spectrum of white

Typical emission spectrum of RGB LEDs

LTPRSM series units can be interfaced with any type of optics, but the best results are achieved with bi-telecentric lenses.
The projection area is undistorted since tilting the pattern causes a linear extension along only one direction.

Excellent results can also be obtained with zero distortion macro lenses; here, the magnification changes along both axes, but image resolution and distortion still easily allows 3D reconstruction.

With non bi-telecentric lenses, a square pattern becomes a trapezoid in the projection plane, whose parallel sides are indicated as “w” and “W” in the drawings below.

The projection area shown in the chart are also a good approximation for standard C-mount lenses used as macro lenses (eventually equipped with spacers).

Original pattern features

Projection area with a bi-telecentric lens

Projection area with a macro lens

Projection area with bi-telecentric lenses (TC series)
		ϑ = 0°		ϑ = 15°		ϑ = 30°		ϑ = 45°
Part number	Projection distance	Projection area	Pattern tilt	Projection area	Pattern tilt	Projection area	Pattern tilt	Projection area	Pattern tilt
	P.d.	W x h	ϑ’	W x h	ϑ’	W x h	ϑ’	W x h	ϑ’
	(mm)	(mm x mm)	(deg)	(mm x mm)	(deg)	(mm x mm)	(deg)	(mm x mm)	(deg)
TC23009	63.3	8.0 x 8.0	0	8.0 x 8.0	15	8.0 x 8.0	30.0	8.0 x 8.0	45.0
TC23016	45.3	15.2 x 15.2	0	15.2 x 15.4	8.01	15.2 x 16.8	17.0	15.2 x 20.0	27.8
TC23024	69.2	22.9 x 22.9	0	22.9 x 23.6	5.4	22.9 x 26.0	11.4	22.9 x 30.5	19.3
TC23036	103.5	32.9 x 32.9	0	32.9 x 34.0	3.7	32.9 x 37.7	8.0	32.9 x 45.3	13.6
TC23048	134.6	43.3 x 43.3	0	43.3 x 44.7	2.8	43.3 x 49.8	6.1	43.3 x 60.3	10.5
TC23056	159.3	51.0 x 51.0	0	51.0 x 52.8	2.4	51.0 x 58.6	5.01	51.0 x 71.3	8.8
TC23064	182.0	58.2 x 58.2	0	58.2 x 60.3	2.1	58.2 x 67.1	4.5	58.2 x 81.7	7.8
TC23080	227.0	72.7 x 72.7	0	72.7 x 73.8	1.7	72.7 x 83.6	3.6	72.7 x 102.0	6.3
TC23096	279.0	85.6 x 85.6	0	85.6 x 88.6	1.04	85.6 x 98.7	3.1	85.6 x 120.9	5.3

Projection area with macro (MC3-03x and MC series) and standard lenses
		ϑ = 0°			ϑ = 15°			ϑ = 30°			ϑ = 45°
Mag.	Projection distance	Projection area		Pattern tilt	Projection area		Pattern tilt	Projection area		Pattern tilt	Projection area		Pattern tilt	Suggested Macro lenses
		w	(W) x h	ϑ’	w	(W) x h	ϑ’	w	(W) x h	ϑ’	w	(W) x h	ϑ’
(x)	(mm)	(mm)	(mm x mm)	(deg)	(mm)	(mm x mm)	(deg)	(mm)	(mm x mm)	(deg)	(mm)	(mm x mm)	(deg)
1.00	46.0	8.0	(8.0) x 8.0	0	7.7	(8.3) x 8.0	15.0	7.5	(8.6) x 8.1	30.0	7.3	(8.9) x 8.1	45.0	MC3-03X, MC100X
0.75	48.0	10.7	(10.7) x 10.7	0	10.3	(11.1) x 10.9	11.4	10.0	(11.6) x 11.4	23.5	9.6	(12.1) x 12.3	37.0	MC3-03X, MC075X
0.50	60.0	16.1	(16.1) x 16.1	0	15.5	(16.7) x 16.5	7.6	14.9	(17.5) x 17.9	16.2	14.3	(18.4) x 20.7	26.7	MC3-03X, MC050X
0.33	92.0	24.3	(24.3) x 24.3	0	23.4	(25.3) x 25.1	5.1	22.5	(26.5) x 27.8	10.8	21.4	(28.1) x 33.3	18.3	MC3-03X, MC033X
0.20	136.0	40.1	(40.1) x 40.1	0	38.6	(41.6) x 42.1	3.1	37.0	(43.6) x 46.2	6.6	35.1	(46.6) x 56.8	11.4	MC3-03X
0.10	275.0	79.5	(79.5) x 79.5	0	76.6	(82.6) x 82.4	1.6	73.5	(86.6) x 92.3	3.4	69.6	(92.6) x 114.2	5.8	MC3-03X

About projection patterns

The projection pattern placed inside the unit can be changed and integrated with ease: just remove the C-mount adaptor by loosening the set-screws and fix the pattern by screwing the retaining ring.

Different types of stripe and grid patterns are available; the chart below shows the line thickness (0.05 mm) and the gap between neighboring lines for each pattern type.

When these features are projected, they become 1/M times larger, with “M” being the magnification of the projection lens. The number of lines mentioned after each part number indicates the number of features on the active area of the pattern.

Photolitography patterns
Substrate	Soda lime grass
Coating	Chrome
Geometrical accuracy	2 μm
Edge sharpness	1.4 μm

									With LTPRHP, LTPRXP and LTPRUP projectors (circular aperture)			With LTPRSMHP projectors (square aperture)
	Format	Process	Substrate	Coating	Line spacing	Thickness	Geometrical accuracy	Edge sharpness	Active area	Number of lines	Max line length	Active area	Number of lines	Line length
					(mm)	(mm)	(µm)	(µm)	(mm)		(mm)	(mm x mm)		(mm)
PT00000100PLine pattern, photolitography	Line	Photolitography	Soda lime glass	Chrome	-	0.05	2	1.4	11	1	11	8 x 8	1	8	Quote
PT00000100LLine pattern, laser engraved	Line	Laser engraving	Borofloat glass	Dichroic mirror	-	0.5	50	50	11	1	11	8 x 8	1	8	Quote
PT00000200PCross pattern	Cross	Photolitography	Soda lime glass	Chrome	-	0.05	2	1.4	11	-	11	8 x 8	-	8	Quote
PT00000200LCross pattern	Cross	Laser engraving	Borofloat glass	Dichroic mirror	-	0.5	50	50	11	-	11	8 x 8	-	8	Quote
PT00000300PStripe pattern	Stripes	Photolitography	Soda lime glass	Chrome	0.95	0.05	2	1.4	11	8	7.78	8 x 8	8	7.78	Quote
PT00000300LStripe pattern	Stripes	Laser engraving	Borofloat glass	Dichroic mirror	0.5	0.5	50	50	11	8	7.78	8 x 8	8	7.78	Quote
PT00000400PGrid pattern	Grid	Photolitography	Soda lime glass	Chrome	0.95	0.05	2	1.4	11	8 x 8	7.78	8 x 8	8 x 8	7.78	Quote
PT00000400LGrid pattern	Grid	Laser engraving	Borofloat glass	Dichroic mirror	0.8	0.2	50	50	11	8 x 8	7.78	8 x 8	8 x 8	7.78	Quote
PT00000500PEdge pattern	Edge	Photolitography	Soda lime glass	Chrome	-	-	2	1.4	11	-	-	8 x 8	-	-	Quote
PT00000500LEdge pattern	Edge	Laser engraving	Borofloat glass	Dichroic mirror	-	-	50	50	11	-	-	8 x 8	-	-	Quote
PTST050450PStripe pattern	Stripes	Photolitography	Soda lime glass	Chrome	0.45	0.05	2	1.4	11	22	11	8 x 8	16	8	Quote
PTST050200PStripe pattern	Stripes	Photolitography	Soda lime glass	Chrome	0.2	0.05	2	1.4	11	44	11	8 x 8	32	8	Quote
PTST050100PStripe pattern	Stripes	Photolitography	Soda lime glass	Chrome	0.1	0.05	2	1.4	11	73	11	8 x 8	53	8	Quote
PTST050050PStripe pattern	Stripes	Photolitography	Soda lime glass	Chrome	0.05	0.05	2	1.4	11	110	11	8 x 8	80	8	Quote
PTST010010PStripe pattern	Stripes	Photolitography	Soda lime glass	Chrome	0.01	0.01	2	1.4	11	550	11	8 x 8	400	8	Quote
PTST020020PStripe pattern	Stripes	Photolitography	Soda lime glass	Chrome	0.02	0.02	2	1.4	11	275	11	8 x 8	200	8	Quote
PTGR050450PGrid pattern	Grid	Photolitography	Soda lime glass	Chrome	0.45	0.05	2	1.4	11	22 x 22	11	8 x 8	16 x 16	8	Quote
PTGR050200PGrid pattern	Grid	Photolitography	Soda lime glass	Chrome	0.2	0.05	2	1.4	11	44 x 44	11	8 x 8	32 x 32	8	Quote
PTGR050100PGrid pattern	Grid	Photolitography	Soda lime glass	Chrome	0.1	0.05	2	1.4	11	73 x 73	11	8 x 8	53 x 53	8	Quote
PTGR050050PGrid pattern	Grid	Photolitography	Soda lime glass	Chrome	0.05	0.05	2	1.4	11	110 x 110	11	8 x 8	80 x 80	8	Quote
PTCD010PCloud of dots pattern, density 10.5%	Cloud of dots pattern density 10.5%	Photolitography	Soda lime glass	Chrome	-	-	2	1.4	11	-	-	8 x 8	-	-	Quote
PTCD020PCloud of dots pattern, density 20%	Cloud of dots pattern density 20%	Photolitography	Soda lime glass	Chrome	-	-	2	1.4	11	-	-	8 x 8	-	-	Quote
PTCD035PCloud of dots pattern, density 35%	Cloud of dots pattern density 35%	Photolitography	Soda lime glass	Chrome	-	-	2	1.4	11	-	-	8 x 8	-	-	Quote

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Product images

LTPRSM pattern projector with a standard C-mount lens

Bi-telecentric lenses used for both projection and vision.

Configuration with zero distortion macro lenses

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