Laser Doppler Vibrometer

LV-1800

Unending evolution deepens non-contact vibration measurement.

The LV-1800 Laser Doppler Vibrometer achieves more than 10 times the sensitivity compared to conventional products due to a newly designed interference optical system, and it is a non-contact vibrometer that allows for confirmation of the laser irradiation position with a built-in camera.

In recent years, small actuators driven by piezoelectric elements, as well as mobile phones, smartphones, and digital cameras equipped with MEMS (Micro Electro Mechanical Systems), have become widespread, and in the automotive sector, inverters and peripheral devices used in EV/HEV vibrate at over 20 kHz.
However, it is difficult to measure vibrations of small parts or in the ultrasonic range using contact-type acceleration pickups, which are widely used for existing vibration detection.

By using the non-contact LV-1800, it becomes possible to quickly and easily detect vibrations. Furthermore, by combining it with a waveform analysis device (FFT analyzer), it is possible not only to measure vibrations but also to accurately capture, visualize, and analyze the state of the vibrations.

Inquiry

Non-contact Vibration/Speed Measurement Seminar Useful for Evaluating Electric Products

(21:26)

Laser Doppler Vibrometer Measurement Examples

Application Examples

		LV-1800
Demodulation method		Optical Heterodyne Detection	speed recovery
laser light	Light source	He-Ne laser	λ = approximately 633 nm
	injection output	1 mW less than
	Laser Safety Standards	Laser Class 2	Please refer to the applicable standards.
	Minimum laser spot diameter	approximately 20 µm or less	Focal position at 100 mm φ = 1/e²
	Minimum laser spot diameter	Below 3 µm (when equipped with LV-0151B)	WD = approximately 38.8 mm
standard lens	variable focus type	100 mm to 10 m (∞)
	distance scale	100 mm to 10 m (∞)	There is an interference distance mark.
	attachment size	M22×0.5 depth 5.5 mm
Built-in positioning camera LV-0181 (optional)	wearing	Embedded within the sensor	Factory-installed *Can be retrofitted upon pickup
	interface	USB2.0	Output from the conversion section via USB mini-B connector.
	imaging sensor	1/4 inch type color CMOS
	number of pixels	approximately 300,000 pixels
	image size	VGA	640×480
	Frame rate	30 frames per second
	Minimum imaging range	10 mm × 7.5 mm (TYP)	WD = 100 mm (minimum)
	Minimum imaging range	2.1 mm × 1.6 mm (TYP)	When the objective lens is attached to LV-0151B
	imaging position	Upright image (rotatable) when facing the indicator face.
	Exposure	automatic
	white balance	automatic
	Gain	automatic
	operating environment	Windows® 10/11	Display True Color greater than 24 bit
	camera focus	Adjustment at the objective lens	Laser spot and confocal
Detection unit suspension	screw hole for suspension	Back part x1	M8 depth 8 mm ※Compatible with LV-0030 large magnet stand
		side part x 1	M8 depth 8 mm ※Compatible with LV-0030 large magnet stand
		side parts x2	M4 depth 5 mm
	tripod setup	Use of LV-0019 camera screw adapter.	Option
Recovery Sensitivity Monitor	Signal Level Indicator	10-segment LED array display	linked with the display of the conversion section level indicator
Recovery Sensitivity Monitor	ERROR Indicator	LED display (red color)
Signal cable	cable length	3 m	Winding storage in the conversion section.
	thickness	φ = 10.5 mm
	covering	oil-resistant coating
	minimum bending radius	R = 40 mm or more
External dimensions of the detection part.	Width	53 mm	excluding the protruding part
	Height	52.5 mm
	Depth	152.5 mm
Weight of the detection unit		約750 g	In the equipment state of option (LV-0181) / excluding cables

		LV-1800
detection speed	Frequency Range	0.3 Hz to 3 MHz (fc=-3dB) *Common for all speed ranges 0.001 (m/s)/V (optional) 0.3 Hz to 200 kHz (fc=-3 dB)
	Maximum detection speed	10 m/s _0-p (20 m/s _p-p)
	minimum speed resolution	Below 0.3 µm/s (0.01 (m/s)/V)	Below 0.05 µm/s (when LV-0800 is installed)
	Output	±10 V (20 V _p-p)	When the input impedance is 100 kΩ or more.
		Amplitude versus Output Voltage Polarity	When approaching the sensor side + voltage
		DC offset	within 20 mV
		output impedance	50 Ω
		minimum input impedance	more than 100 kΩ
		Connector type	BNC (C02 type)
speed range	1.0 (m/s)/V	10 m/s _0-p (20 m/s _p-p)
	0.1 meters per second per volt	1 m/s _0-p (2 m/s _p-p)
	0.01 (m/s)/V	0.1 m/s _0-p (0.2 m/s _p-p)
	0.001 (m/s)/V (option)	0.01 m/s _0-p (0.02 m/s _p-p) ※For details, refer to the LV-0800 micro speed range board.
	Over Indicator	Detection speed limit +5% Over activates red LED.
Recovery Sensitivity Monitor	Signal Level Indicator	20 Segment LED Array Display	Linked with the detection unit level display
	Monitor output	0 to 10 V
		output impedance	50 Ω
		minimum input impedance	more than 100 kΩ
		Connector type	BNC (C02 type)
	ERROR Indicator	LED (red) lighting indication
High-pass filter (HPF)		100 Hz	fc=-3dB
High-pass filter (HPF)		OFF(0.3 Hz)	fc=-3dB
low pass filter		50 kHz	fc=-3dB ※ Not selectable when using the 0.001(m/s)/v range
		100 kHz
		1 MHz ^※
		OFF (3 MHz)
Positioning video output (optional)	video output	digital
	Standard	USB2.0
	Display	LED (white) lights up	When attached to LV-0181
	connector type	USB mini-B type
Laser Radiation Control	ON/OFF via the front panel switch	The specification for starting laser radiation upon power-on (panel mode) is possible with the factory settings.
	Laser ON Indicator	Laser Emission LED (Green)
	light-blocking shutter	Contact Input	Stop laser emission by opening the contact.
		Connector type	Receptacle: RM12BRB-2S
		Connector type	Plug: RM12BPE-2PH (short-circuited)
storage device	Detection Unit Storage	Store in the conversion section.
storage device	Cable storage	Winding storage in the conversion section.
Outline Dimensions	Width	410 mm	excluding each protruding part
	Height	120 mm
	Depth	324 mm
Weight		約8.1 kg	including sensor cables
Operating temperature range		0 to 40 °C
Operating Humidity Range		30 to 80 % RH	However, it should not condense.
Storage Temperature Range		-10 to 50 °C
input voltage		AC 100～240 V
input voltage		50/60 Hz
power consumption		60 VA
cooling method		Natural air cooling (vibration-free cooling)

		LV-1800
Applicable Standards	Laser safety	IEC 60825-1:2007:2014
		EN 60825-1:2007:2014/A11:2021
		FDA (CDRH) 21CFR 1040.10 and 1040.11 except for conformance with IEC 60825-1 Ed.3., as described in Laser Notice No. 56.
	CE marking	Low Voltage Directive	2014/35/EU	Standard EN 61010-1 EN 60825-1
		EMC instruction	2014/30/EU	Standard EN 61326-1
		RoHS Directive	2011/65/EU	Standard EN IEC 63000

Target amplitude: Polarity of output voltage

<Resolution and Dynamic Range Evaluation Conditions>
LPF: 100 kHz ON
Maximum demodulation using corner cube
FFT analyzer power spectrum observation
1 kHz range 1 kHz, 2048 lines, 256 times averaging
※ Please refer to the graph for the frequency characteristics of each filter.
LV-0181 Built-in Camera Imaging Size for Positioning
The relationship between operating distance and spot diameter

The LV-0121A digital displacement meter is equipped with a digital displacement output. By using the LV-0930 displacement analysis software, the vibration amplitude detected by the LV-1800 + LV-0121A digital displacement meter can be output via USB 2.0 as digital displacement values (m) with a maximum sampling rate of 1 MHz and a resolution of 0.155 nm for analysis. On the LV-0930 displacement analysis software, you can perform conversions from displacement (m) to velocity (m/s) and acceleration (m/s ²), as well as moving averages, differential operations, and FFT analysis without signal degradation. Various waveform conversions and analysis results can be exported as CSV files. By importing the CSV data into spreadsheet software or the OS-2000 series time-series data analysis tools, even more advanced data processing can be performed.

Connector type: USB2.0 Mini-B type on the device side
Imaging sensor: CMOS color sensor 1/4 inch
Pixel count: 300,000 pixels or more
Image size: VGA (640×480)
Frame rate: 30 frames/second
Capture range: 10 mm × 7.5 mm ～ (Measurement distance 100 mm ～)
Functions: Exposure/Gain/White balance (automatic)
Operating environment: Standard compatible with Windows® 10/11
Display True Color 24bit or more
Camera focus: Shared with laser light focus
Accessories: LV-0181 Camera Monitor software CD-ROM
USB cable (CF-0703) 1.5 m

Speed range: 0.001 (m/s)/V (0.01 m/s _0-p (MAX))
Speed resolution: 0.05 µm/s ※ at maximum demodulation
Frequency range: 0.3 Hz to 200 kHz (fc = -3 dB)

LV-0112 Displacement Output Board / LV-0111 Acceleration Output Board

Signal source: Receives LV-1800 speed signal internally
Output voltage: ±10 V (MAX)
DC offset: Within 20 mV
Maximum amplitude: 10 times of each set range (0-p)
Amplitude conversion error: Within ±5%
Amplitude output polarity: Positive voltage when approaching the sensor side

LV-1800 Setting Range	Displacement Setting Range
LV-1800 Setting Range	1 Hz to 20 kHz	10 Hz to 50 kHz	1 kHz to 200 kHz
1.0(m/s)/V	100 mm/V	1 mm/V	10 micrometers per volt
0.1 (m/s) / V	10 mm/V	100 µm/V	1 micrometer per volt
0.01 (m/s) per V	1 mm/V	10 micrometers per volt	100 nm/V
0.001(m/s)/V	0.1 mm/V	1 micrometer per volt	10 nm/V

LV-1800 Setting Range	Acceleration setting range
LV-1800 Setting Range	1 Hz to 2 kHz	1 Hz to 20 kHz	100 Hz to 400 kHz
1.0(m/s)/V	10 ³ (m/s ²)/V	10 ⁵ (m/s ²)/V	10 ⁷ (m/s ²)/V
0.1 (m/s) / V	10 ² (m/s ²)/V	10 ⁴ (m/s ²)/V	10 ⁶ (m/s ²)/V
0.01 (m/s) per V	10 ¹ (m/s ²)/V	10 ³ (m/s ²)/V	10 ⁵ (m/s ²)/V

Compatible lenses: LV-0150B (5×) / LV-0151B (10×)
LV-0152B (20×)
Illumination method: White cold light coaxial incident illumination by LED
Pixel count: 300,000 pixels or more
Cable length: 1.5 m (when using the included extension cable)
Light source: Cold light illumination by white LED
Control: Variable adjustment
Operating temperature range: 0 to 40 ℃ (no condensation)
Operating humidity range: 30 to 80 %RH (no condensation)
Input voltage: AC 100 V to 240 V 50/60 Hz
Power consumption: 3.5 VA at AC 100 V / 9.0 VA at AC 240 V

The LV-0383 three-dimensional microscope unit is an optical unit for the Laser Doppler Vibrometer. With three Laser Doppler Vibrometers and a microscope device, it can non-contact detect the vibrations of small objects occurring in three axial directions. Coaxial illumination and two digital video cameras with different magnifications (optional) enable quick and accurate positioning and still image recording. It allows for the evaluation of the three-dimensional behavior of MEMS (Micro Electro Mechanical Systems), microstructures, small mass targets, and ultrasonic-driven target vibrations that are difficult to detect by contact methods.

Objective Lens LV-0150B

Magnification: 5x
WD: 36.1 mm
Spot diameter: ⌀4 μm or less
Includes conversion adapter
Objective lens LV-0151B

Magnification: 10x
WD: 38.8 mm
Spot diameter: ⌀3 μm or less
Includes conversion adapter
Objective Lens LV-0152B

Magnification: 20x
WD: 22.5 mm
Spot diameter: ⌀2.5 μm or less
Includes conversion adapter
Large Magnet Stand LV-0030

This is a dedicated magnetic stand for sensor suspension. It allows for free laser irradiation with a cross clamp. When combined with micro stages LV-0015/LV-0016, it enables fine adjustments of the detection position.
Slim Type 90-Degree Reflective Mirror LV-0105

Convert the tip of the 90-degree reflection mirror to a diameter of 4 mm. Rod tip diameter: 4 mm.
90-degree reflection mirror LV-0301

By attaching it to the tip of the LV-1800 lens, you can bend the laser light by 90 degrees and rotate it 360 degrees. It is possible to detect recessed areas by inserting a mirror into gaps. Rod tip diameter: ⌀10 mm.
XY Axis Micro-Movement Stage LV-0015

The LV-0030 can be combined with a large magnet stand for precise positioning in the XY direction. It can also be used for positioning samples when used alone.
Stage surface: 60 × 60 mm
Movement range: ±6.5 mm
Z-axis fine motion stage LV-0016

The LV-0030 allows for slight vertical movement when combined with a large magnet stand. It makes focusing laser light and images, as well as positioning, easy to perform.
Stage surface: 60 × 60 mm
Movement amount: 0–13 mm
Steel Plate LV-0018A

The LV-0030 large magnet stand can be used on a large tripod head or on a non-magnetic table. Additionally, by directly securing the LV-0015/0016 fine adjustment stages with screws, it can prevent the stage or sensor from falling.
Camera Screw Adapter LV-0019

This is an adapter for mounting the LV-1800 sensor onto a large tripod head (1/4 inch screw).
large tripod

It is used for installing sensors and stands in places without a base plate. Please use it together with the LV-0018A steel plate and the LV-0019 camera screw adapter.
Storage Trunk LV-0350

This is a trunk that can store the main unit of the LV-1800 and options such as a large magnet stand.
Items that can be stored
・LV-1800 × 1 / ・LV-0030 (+LV-0015/0016) × 1 / ・Objective lens × 2 / ・LV-0185 × 1 / ・LV-0018A × 1
Liquid measurement jig (made to order)

This is a jig for efficiently irradiating and receiving laser light inside a liquid. Two types are prepared: a tube type and a quartz rod type compatible with solvents. You can choose to directly attach it to the sensor or have the jig suspended separately.
※ For details, please consult separately.