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JULIGHT
Julight was founded in 2011 with the goal of bringing from university laboratories to everyday life the great potential of laser and photonic technologies.
The expertise of Julight stems from the knowledge acquired over years of applied scientific research by the Dipartimento di Ingegneria Industriale e dell’Informazione of Università di Pavia, and the Dipartimento di Elettronica e Informazione of Politecnico di Milano.
Julight promotes a smart use of photonic technologies and laser light, by combining opto-electronic integration, miniaturization and cost-effectiveness.
Julight offers a new class of contactless devices and instruments, enabling accurate control and monitoring of industrial processes and product quality.
The R&D strategy of Julight also targets the development of devices for life-science, that may open the way to new medical diagnosis methods and treatments.
Non contact vibration measurements are crucial whenever the solid object under test cannot be accessed directly and/or conventional contact sensors (accelerometers) are not recommended, as in the following cases:
- the structure to be tested is lightweight (piezo-transducer, loudspeaker membrane)
- the object under test is at high temperature
- the object under test is rotating
- the operator wants to avoid the time-consuming and critical procedure of gluing the accelerometer to the object under test
Julight supplies two series of products for the measurement of the vibration of a remote object without contact to its surface.
Julight’s Laser Vibrometers are based on the novel Self-Mixing interferometric configuration, and allow easy and accurate non–contact vibration measurements on all rough and diffusive surfaces (e.g.: unfinished metal, plastic, rubber, paper, fabric, etc.).
They provide an analog electrical output which is a replica of the target displacement (1mV/µm responsivity, corresponding to 1mm/V), in a frequency range from DC up to to 50 kHz, with a minimum measurable displacement as small as 0.4 nm (for 1Hz noise bandwidth), a peak-to-peak maximum vibration amplitude larger than 20 mm, and a maximum velocity of 1 m/s.
A very small optical head is the distinctive feature of Julight’s laser vibrometers:
- standard optical head, with Speckle-Tracking functionality (Size: 105mm x 60mm x 40mm) for both fixed-focus and autofocus versions.
- optional ultra-small optical head, without Speckle-Tracking and Autofocus functionality (Size: length 50 mm; Diameter 15 mm)
The simple but efficient electronic system that processes the interferometric signal can be made so compact that a single VSM400 (or VSM4000) instrument can allocate up to 4 optical heads (i.e., up to 4 independent optical channels), thus allowing to perform simultaneous vibration on different points without the need for a scanning system
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Description |
VSM1000 |
VSM4000 |
VSM1000-L |
VSM100 |
VSM400 |
VSM3D |
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Maximum measurable vibration (peak-to-peak) |
43 mm (theoretical) 1 mm (practical) |
43 mm (theoretical) 1 mm (practical) |
43 mm (theoretical) 1 mm (practical) |
25.5 mm |
25.5 mm |
43 mm (theoretical) 1mm (practical) |
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Maximum measurable velocity |
> 1 m/s |
> 1 m/s |
0.5 m/s @ 0.5 m 0.2 m/s @ 5.0 m |
> 1 m/s |
> 1 m/s |
0.5 m/s |
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Output signals |
· Displacement / Velocity (analog, BNC connector) · Monitor (3.5mm jack):
- Optical Signal Level (analog) |
· Displacement / Velocity (analog, BNC connector) · Monitor (3.5mm jack):
- Optical Signal Level (analog) |
· Displacement / Velocity (analog, BNC connector) · Monitor (3.5mm jack):
- Optical Signal Level (analog) |
· Displacement / Velocity (analog, BNC connector) · Monitor (3.5mm jack):
- Optical Signal Level (analog) |
· Displacement / Velocity (analog, BNC connector) · Monitor (3.5mm jack):
- Optical Signal Level (analog) |
· X, Y, Z Displacement (analog, 3x BNC connectors) · Monitor (3.5mm jack):
- Optical Signal Level (analog) |
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Output signal responsivity |
· Displacement: 0.5 V/mm · Velocity: 5 V/(m/s) |
· Displacement: 0.5 mV/mm · Velocity: 5 V/(m/s) |
· Displacement: 0.5 V/mm · Velocity: 5 V/(m/s) |
· Displacement: 1 V/mm · Velocity: 10 V/(m/s) |
· Displacement: 1 V/mm · Velocity: 10 V/(m/s) |
· Displacement: 0.5 V/mm |
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Resolution |
Noise-limited |
Noise-limited |
Noise-limited |
Noise-limited |
Noise-limited |
Noise-limited |
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Noise Equivalent Displacement |
0.2 nm/ÖHz (from DC to 50 kHz) |
0.2 nm/ÖHz (from DC to 50 kHz) |
0.2 nm/ÖHz @ 0.5 m 1 nm/ÖHz @ 5.0 m |
0.1 nm/ÖHz (from DC to 50 kHz) |
0.1 nm/ÖHz (from DC to 50 kHz) |
0.2 nm/ÖHz (from DC to 50 kHz) |
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Output signal accuracy |
1% |
1% |
1% |
1% |
1% |
1% |
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Spatial transversal resolution |
100 mm |
100 mm |
100 mm |
100 mm |
100 mm |
100 mm |
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Target surface |
Diffusive or back-reflecting |
Diffusive or back-reflecting |
Diffusive or back-reflecting |
Diffusive or back-reflecting |
Diffusive or back-reflecting |
Diffusive or back-reflecting |
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Working distance |
· From 20 to 120 cm (Auto Focus mode) · 20, 40 and 100 cm (Fixed Focus mode) |
· From 20 to 120 cm (Auto Focus mode) · 20, 40 and 100 cm (Fixed Focus mode) |
· From 0.5 to 5.0 m (Auto Focus mode) · 0.5, 1.0 and 5.0 m (Fixed Focus mode) |
· 40 cm +/- 2 cm (upon request) |
· 40 cm +/- 2 cm (upon request) |
· 15 cm (accurate positioning assisted by LED bar indicator) |
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Laser radiation |
· Pout < 1 mW @ 650 nm (collimated) |
· Pout < 1 mW @ 650 nm (collimated) |
· Pout < 1 mW @ 650 nm (collimated) |
· Pout < 17 mW @ 785 nm (focused) |
· Pout < 17 mW @ 785 nm (focused) |
· Pout < 1 mW @ 650 nm (collimated) |
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Laser safety class |
· Class 2 @ 650 nm (visible) |
· Class 2 (visible) @ 650 nm |
· Class 2 @ 650 nm (visible) |
Class 3B |
Class 3B |
· Class 2 @ 650 nm (visible) |
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Optical head |
50 mm x 70 mm x 105 mm |
50 mm x 70 mm x 105 mm |
50 mm x 70 mm x 105 mm |
50 mm x 70 mm x 105 mm |
50 mm x 70 mm x 105 mm |
155 mm x 145 mm x 80 mm |
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Electronic unit dimensions |
12.5 cm x 15.5 cm x 29.6 cm |
24.6 cm x 15.5 cm x 29.6 cm |
12.5 cm x 15.5 cm x 29.6 cm |
12.5 cm x 15.5 cm x 29.6 cm |
24.6 cm x 15.5 cm x 29.6 cm |
24.6 cm x 15.5 cm x 29.6 cm |
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Optical head cable length |
2.5 m (5 m optional) |
2.5 m (5 m optional) |
2.5 m (5 m optional) |
2.5 m (5 m optional) |
2.5 m (5 m optional) |
2 m (5 m optional) |
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Power supply |
· 110-120 VAC / 60 Hz · 220-240 VAC / 50 Hz |
· 110-120 VAC / 60 Hz · 220-240 VAC / 50 Hz |
· 110-120 VAC / 60 Hz · 220-240 VAC / 50 Hz |
· 110-120 VAC / 60 Hz · 220-240 VAC / 50 Hz |
· 110-120 VAC / 60 Hz · 220-240 VAC / 50 Hz |
· 110-120 VAC / 60 Hz · 220-240 VAC / 50 Hz |
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Power consumption |
< 5 W |
< 5 W per channel (max 20 W) |
< 5 W |
< 5 W |
< 5 W per channel (max 20 W) |
< 15 W |
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I/O |
RS485 serial port |
RS485 serial port |
RS485 serial port |
RS485 serial port |
RS485 serial port |
RS485 serial port |
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Weight |
4 kg |
4¸6 kg |
4 kg |
4 kg |
4 ÷ 6 kg |
6 kg |
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Temperature (operating) |
Optical head: -20°C to +80°C (-4°F to +176°F)
Main unit: |
Optical head: -20°C to +80°C (-4°F to +176°F)
Main unit: |
Optical head: -20°C to +80°C (-4°F to +176°F)
Main unit: |
Optical head: -20°C to +80°C (-4°F to +176°F)
Main unit: |
Optical head: -20°C to +80°C (-4°F to +176°F)
Main unit: |
Optical head: 0°C to +80°C (+32°F to +176°F)
Main unit: |
USE
The optical head shall be placed in front of the vibrating surface, at a working distance between 0.2 and 1.0 m. Electrical vibration signal is then readily available from the BNC output connector of the electronic unit. The signal can be supplied to an oscilloscope/acquisition system or to a FFT analyzer for frequency domain analysis.
A LED-bar indicator measures the back-scattered optical signal strength in real–time, and helps to avoid signal fading caused by speckle–pattern effects.
Automatic Speckle-Tracking allows unattended operation on any diffusive surface: the system automatically tracks a bright spot/site on the target surface, eliminating signal fading.
APPLICATIONS
• Non-contact measurement of displacement and vibrations (also at very low frequency)
• Vibration measurement without mass-loading on small, soft and delicate structures
• Material and structural analysis
• Automotive, aerospace and energy industry (engines and turbines monitoring, validation tests…)
• Loudspeaker, piezoceramic an MEMS testing/characterization
• Modal analysis
• On–line process control in industrial plants
• Machine Condition Monitoring
• Quality tests
Triangulation Laser Distance Sensors
Julight designs and manufactures SPECIALTY LASER SENSORS for distance and vibration measurements, based on the well-known and reliable laser triangulation principle. Julight’s sensor are developed according to customer’s needs, and offer exceptionally high value for money. Julight’s Laser Triangulation Sensor are designed to achieve a wide electrical bandwidth (up to 100kHz), while keeping a compact
Triangulation Laser Distance Sensors
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Name |
Channels |
Working Distance |
Laser Class |
Datasheet |
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LT2004-20k |
BW=20kHz |
20 cm |
2 |
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LT1505-1000k |
BW=1MHz |
15 cm |
3B |
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LT1505-1000k-HR |
BW=1MHz |
15 cm |
3B |
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Julight designs and manufactures SPECIALTY LASER SENSORS for distance and vibration measurements, based on the well-known and reliable laser triangulation principle. Julight’s sensor are developed according to customer’s needs, and offer exceptionally high value for money.
Julight’s Laser Triangulation Sensor are designed to achieve a wide electrical bandwidth (up to 100kHz), while keeping a compact size and high sensitivity. They are particularly recommended to measure the vibration of rotating targets because they are not negatively affected by speckle-pattern effects, contrarily to the LDV interferometric approach.
Julight’s triangulation sensors have been tested to measure vibration and eccentricity of small tools (electrodes for micro-EDM, with diameters from 0.3 to 3mm) rotating at speeds up to 30000rpm.
For short-range sensors, the sensitivity reaches the value of 10nm noise-equivalent displacement for 1Hz bandwidth.
