Laser Doppler Surface Velocity Meter
LV-7000 series

 

Product picture(Laser Doppler Surface Velocity Meter LV-7000series)

LV-7000 series detects speed, uneven speed, distance, length of moving object or rotating object by non-contact detection with high sensitivity and high response. You can install and measure easily in the place where had been difficult in measurement so far.

The LV-7000 series enables evaluation of product features and helps to understand the phenomena more accurately. Non-contact and accurate laser detection is useful for improving parts quality, and useful for reducing loss of material.


Features
  • High sensitivity detection, safety Class 2 laser products

  • · “Laser Safety Class 2” does not need safety requirement for detection such as laser protection glass, laser control regions/controller.
    · Original optical system and demodulating circuit allow high sensitivity detection. Available to measure wide variety of targets
    · Easy, quick positioning and checking with red visible light.
     

  • Non-contact detection, No-load measurement

  • · Not necessary to worry about defects such as scratch, wrinkle, or transformation.
    · Hardly affected by flipping, shaking, or eccentricity. Slip or friction is not generated.
    · Enables speed measurement and length measurement in vertical driving, negative gradient driving, which are difficult to detect by contact-type detector.
    · Expansion speed/direction measurement of extensible materials including rubber, resin, and clothe.
     

  • Simple operation but high function

  • · High spatial resolution with small laser-spot. Enables measurement of thin/tiny target including slender thread and narrow parts.
    · Indicator on a compact sensor allows you to check the target and operating condition at the same time.
    · High speed response of 800 m/s2. Steep start and stop from zero speed are able to be detected.
    · Able to be performed difference measurement between two points by setting two speedometers
    · High resolution detection even though the tiny speed by high resolution range.
    · Easy to see numerical values by large LED display and stand jigs.
    · Simple and speedy operation with large function button. Current setting conditions are clear at a glance.
    · Selectable output signal format from analog, digital, and phase difference depending on the usage.
     

 

Laser Doppler Surface Velocity Meter LV-7000 series Promotion movie (YouTube)

 

Application

Torsion・torsion vibration measurement

Torsion or torsion vibration measurement of transmission power train, drive-train, rotation shaft, turbine, forging crank or shaft etc.

ねじれ・ねじれ振動測定

Speed and behavior measurement of tire

Behavior measurement between tire and grounding surface, such as speed difference, peripheral speed change/difference, torsion, deformation, slip.

タイヤの速度・挙動測定

 

Behavior measurement of pulley/belt

Speed, slippage, expand or contract, and differential of belts for crank pulley, alternator, compressor, compression machine etc.

Measurement for material evaluation

Detection of stretching position of material, difference of stretching position and stretching speed, behavior of compression/stretching.

 

Speed・uneven speed measurement

Speed・uneven speed measurement of paper, film, rubber, woven cloth, non-woven cloth, cloth, plastic.

Measurement of winding length

Length measurement of thread, copper wire for elevator, hose, harness, coated wire material

 

Slip amount measurement in conveyance

Slip amount measurement on conveyance of printer, photo copy machine, scanner, paper, woven cloth, non-woven cloth, plastic cloth

Conveyance at vertical・negative gradient

Speed・uneven speed measurement of paper, film, rubber, woven cloth, non-woven cloth, plastic cloth on vertical・negative gradient conveyance

 

 

Sensor controller

Laser Doppler surface velocity sensor and meter controller

System

 

System Oscope2 時系列データ解析ツール RV-3150 リバーシブルカウンタ DR-7100 音響振動データレコーダ CF-9200/9400 ポータブルFFTアナライザ DS-3000シリーズ データステーション

Measurement principle

Measurement principle 1.
~Detection speed of moving object~

1. Interference fringe is generated in the intersection of 2 laser beam in angle at 2θ.

2. Particle passes through in the range of interference fringe. (Particle=target object)

3. When the particle passes through the interference fringe, the laser beam is lighted in alternate shifts as light > dark > light > dark….When particle speed (v)/ Interval of Interference fringe (d), the light-dark frequency (cycle) by scattered light is f = v/d

4.  The sensor is received this scattered light (backscatter) at the receiver, and the frequency f is obtained.

5. The interval of interference fringe is fixed, so the velocity V is able to be obtained.

 

Measurement principle

Measurement principle 2.
~Detection of variation direction, polarity~

Detection of moving direction and polarity is required for measuring speed fluctuation or unevenness. Moving direction and polarity of velocity v can be detected by shifting frequency of one of the two laser lights with AOM to make the interference fringe move with corresponding speed to the frequency shift amount ⊿f.

 

The direction and polarity are determined by whether the frequency strength f of the scattered light which has been detected at receiver is higher or lower compared to the shift frequency.


f' < ⊿f:Frequency lower than shift frequency
f' > ⊿f:Frequency higher than shift frequency

 

測定原理

Specification

LV-7002 Laser Doppler surface velocity sensor

Detection method Laser Doppler system, back-scattering differential type
Detection polarity “+” when moving from the left to the right of the front of the sensor
Distance accuracy ±0.2 % or less (at 25 ℃ by distance evaluation on the standard surface by Ono Sokki.)
Laser beam
Laser safety class Class2 IEC60825-1:2007:2014 (JIS6802:2014)
Measuring Laser λ=1550 nm
less than 10 mW CW oscillation
Guide laser λ= 635 nm
less than 1 mW CW oscillation
Laser beam spot size 2 mm × 1 mm oval (long span: in a direction parallel with a moving object)
LD light source life

Aiming light source:10000 hours or more (25℃)
* Theoretical calculated value
Measurement light source:approx. 10000 hours

*Theoretical calculated value
When the output light is less than specified range, the LASER LED and measurement light of controller side is flashed and the measurement light of controller side when the output light is less than specified range.
Detection distance
Center of detection distance 200 mm *from the bottom surface of the sensor
Detection range (depth) ±4 mm distance accuracy:±0.2 (of Reading) % or less
±10 mm distance accuracy:±5 (of Reading) % or less
*at 25 ℃ by distance evaluation on the standard surface by Ono Sokki.
Detection velocity
Scale factor Automatically calculated and read out to the controller from the sensor.
Detection velocity range 0 to ±1800 m/min
Maximum tracking acceleration 800 m/s2 or more
Sensor suspending
Screw hole for LV-0030 Large magnet stand

Thread nominal diameter:M8 Appropriate tightening torque requirement
(6 N・m: corresponds to 0.5T type)
Number of holes: 1
Position:Sensor reference part, detection center axis

Depth:8 mm or more
Screw hole for sensor suspension

Thread nominal diameter:M4 Appropriate tightening torque requirement (1.5 N·m)

Increased strength by helical insert processing
Number of holes: 4
Position:Sensor reference part, four corners
Depth:4 mm or more
Options
Screw hole for 90-degree beam bending mirror

Thread nominal diameter:M3 Appropriate tightening torque requirement (0.6 N·m)

Increased strength by helical insert processing
Number of holes: 2
Position: Sensor front part
Depth: 3 mm or more
Light receive sensitivity monitor
Light receive signal level (SIG LEVEL) Display the light reception level in 5-segment LED (green)
Light signal error (ERROR) LED (red) lights up when demodulation error is occur.
Laser radiation monitor (LASER) LED (green) lights up when laser for measurement is radiated.
Outer dimensions W 75 mm X H 40 mm X D 155 mm
Weight of the main unit Approx. 750 g (not including option/ cable)
Conforming standard
Laser safety FDA 21CFR Part 1040.10 (CDRH)
IEC60825-1:2007:2014 Class2
JIS C 6802 :2007:2014 Class2
EMC standard FCC (Part15B) :2015
CANADA EMI standard (ICES-003):2016
EN61326-1:2013 class A Table2
Safety EN61010-1:2013
Operating environment

Temperature range 0 to 40 ℃

Humidity range 20 to 80 % (with no condensation)
Storage environment

Temperature range -10 ℃ to 50 ℃

Humidity range 20 to 80 % (with no condensation)

* Within the operating temperature range.

 

LV-7100 Laser Doppler Surface Velocity Meter Controller

Detection velocity
Detection velocity range

0 to ±1800 m/min

Tracking acceleration 800 m/s2 (MAX) :when [FAST] is selected at RESPONSE.
400 m/s2 (MAX) :when [SLOW] is selected at RESPONSE.
Velocity output (VELOCITY OUT)
Output voltage ±10 V (20 V p-p) :When input side impedance is 100 kΩ or more. *Short circuit protection Polarity; “+ voltage” when moving from the left to the right of the front of the sensor. “- voltage” when moving from the right to the left of the front of the sensor. *Reversible
DC offset 180 (m/min) /V ±90 m/min or less
50 (m/min) /V ±25 m/min or less
10 (m/min) /V ±5 m/min or less
1 (m/min) /V ±0.5 m/min or less
1 (m/min) /V
(HIGH RESOLUTION) ※fc=10 Hz 
±0.05 m/min or less
Linearity
* Excluding the DC offset
180 (m/min) /V ±1 % (F.S) or less
50 (m/min) /V ±1 % (F.S) or less
10 (m/min) /V ±2 % (F.S) or less
1 (m/min) /V ±5 % (F.S) or less
1 (m/min) /V
(HIGH RESOLUTION) ※fc=10 Hz 
±5 % (F.S) or less
Cutoff frequency 5 kHz LPF GAIN fc= -3 dB
Output impedance 50 Ω or less: Should be received at 100 kΩ or more of impedance (input side).
Output terminal format BNC (receptacle), front panel side
Polarity switch (+/-)

Polarity inversion with the front panel [+/-] button

Polarity inversion of digital display/ Polarity inversion of velocity output voltage

LED (red) lights up while polarity inversion period

Velocity range
(VELOCITY-RANGE (m/min) /V)
180 (m/min) /V Measurement lower limit: 0.54 m/min or less in rms value*
50 (m/min) /V Measurement lower limit: 0.50 m/min or less in rms value*
10 (m/min) /V Measurement lower limit: 0.03 m/min or less in rms value*
1 (m/min) /V Measurement lower limit: 0.003 m/min or less in rms value*
1 (m/min) /V
(HIGH RESOLUTION)

Resolution: 0.01 m/min or less in rms value *

Cutoff frequency 10 Hz *GAIN fc= -3 dB

Velocity range over LED (red) lights up when upper limit of each range is 1% over.
Low-pass filter
(VELOCITY-LPF)
Select with the button in the [LPF] on the front panel.
1 kHz GAIN fc=-3 dB (allowance ±2.0 dB)
300 Hz
OFF GAIN fc= 5 kHz (-3 dB)
Phase difference, pulse output (SIG A / SIG B OUT)
Output waveform 2-phase square wave output
Output format Line driver output Hi:2.5 V or more
Lo:0.5 V or less
Response time:up to 1 MHz
Totem-pole output Hi:10.5 V or more
Lo:0.5 V or less
Response time:up to 100 kHz
Phase difference 90 °±60 °  T:cycle T/4±T/6
Duty ratio 50 %±20 %  T:cycle T/2±T/5
Shape of output terminal NJC-2010-RF (receptacle) NANABOSHI ELECTRIC
Pulse width (A,B Phase) Dividing ratio: 1, 2, 4, 8, 16, 32, 64, 128, and 256 (The phase difference and the duty ratio)
Pulse width selection Dip-switch setting
Display section
Display unit 7-segment LED (green)
7-digit + polarity (1-digit)
Decimal point
Fixed in the unit or velocity range
Display update interval
0.1 s
Max. display length

9999.999 m
Distance reset 0 Reset the distance in the front panel side 【LENGTH RESET】 
0 Reset the distance in the rear panel side 【RESET IN】
Unit selection

Selectable with 【UNIT SELECT】 button
Speed: m/s, mm/min, m/min

Distance: m, mm
Display of light receive signal level error Flashing display the displaying unit
Display while searching [-] display
Display of scale factor error Displayed "8.8.8.8.8.8.8.8." by 7-segment LED
Display of Max. distance Flashing display
Light receive monitor
Light receive signal level display
(DETECT - LEVEL)
10-segment LED (green) array display
Light receive signal level output
(LEVEL OUT)
Output terminal format: BNC (receptacle)
Output signal: 0 to 14 V Proportional to light receive signal level
Frequency response: GAIN fc=5 kHz (-3 dB)

Light receive signal level error display (DETECT-ERROR)

 

LED (red) lights up when the light receive level is decreased.

Light receive signal level error output (ERROR OUT)

 

Output terminal format: NJC-163-RF (Receptacle)
Output method: Open collector (negative logic)

Output withstand voltage: 30V or less
Sync current: 50mA or less

Search (DETECT-SEARCH)

 

Search operation with [SEARCH] button
Serial interface (RS-232C)
Standard RS-232C
Connector D-sub 9 pin
Communication specification Communication method Asynchronous full-duplex
Data signal speed (bit/ second) 19200
Character length 8 bits
Parity bit None
Start bit 1 bit
Stop bit 1 bit
Terminator CR+LF
Flow resistance None

Polarity switch (+/-)

Polarity inversion with the front panel [+/-] button

 

Polarity inversion of digital display/ Polarity inversion of velocity output voltage
LED (red) lights up while polarity inversion period

Distance reset input

(RESET IN)

 

Terminal format NJC-163-RM (Receptacle)
Input method Non-voltage a contact
Safety lock connection
(SAFETY LOCK)
Input terminal format

RM12BRD-2S (Receptacle)

*Short-circuit processing parts is supplied as standard.
Input method

Non-voltage a contact input

Laser is radiated when device is short circuited.

Laser radiation ON/OFF

(LASER)

 

ON/OFF with the [LASER] button on the front panel

LED (green) lights on when it is ON
Warning display

Guide laser’s lifetime warning: Flashing approx. 1s interval

Laser light failure: Flashing approx. 0.1s interval
Fail safe function

Always start with laser off when the power is ON. 
*Can be modified to the operation board type which starts laser emission when the power is turned ON.

Laser receiving level setting

(DETECT-LOW TO HIGH)

 

Laser receiving level setting 4 ranges
Select with the button in the [LOW TO HIGH] of the front panel. *LOW is selected at the time of shipment

Key lock
(KEY MARK)

 

Select with the button in the [KEY LOCK] selection switch of the front panel.
Select Press and hold the button for approx. 2 seconds. * LED (white) flashes while selecting.
Cancel Press and hold the button for approx. 2 seconds.
Key locked range Lock all key operation except [LASER] ON/OFF
Controller connection
(CONNECT IN/OUT)
Signal connection Number of connection unit: Max. 2 with electrical connection
Function when connected with a cable: Reset the distance of LV-7100 (2 units) at the same time.
Case connection

Connecting two LV-7100 on top and bottom positions (stacking) are available.*LV-0772 Connection kit is required.

Operating environment Temperature range 0 ℃ to 40 ℃
Humidity range 20 to 80 % with no condensation
Storage environment Temperature range -10 ℃ to 50 ℃
Humidity range 20 to 80 % with no condensation
Power requirement Input voltage 100 to 240 VAC
50/60 Hz
Power consumption 70 VA or less
Power switch ON/OFF by locker switch
Cooling of main unit Forced-air cooling
Outer dimensions W 310 X H 135 X D 176 (mm) or less (excluding handle/ protruded section)
Weight Approx. 3 kg (controller only)

*Condition (FFT Power Spectrum, 5kHz range measurement, PEAK value by using reference measurement target)

Model name Product name Rated value
LV-7002 Laser Doppler Surface Velocity Sensor WD=200
LV-7100 Laser Doppler Surface Velocity Meter Controller -
LV-0703 Sensor cable 3 m
LV-0705 Sensor cable 5 m
LV-0772 Connection kit 2 sets for LV-7100
LV-0791 Storage trunk For 1 set

Option

90-degree beam bending mirror (LV-0752)

 

LV-0752 90度反射ミラー

 

This is an optic jig to bend the laser light to ±90 degrees. Measurement of the object which is in a narrow place or in a gap between instruments is possible with this option.

 

LV-0752 90度反射ミラー

Example of use

 

Made to order product

 

 

 

Sensor suspension adapter (LV-0762)

 

 

Attaching the LV-0762 to the sensor increases the fixed portions, so overhanging and inverted suspension of the sensor are available. It is able to be suspended in four directions by attaching the LV-0762.

LV-0752 90度反射ミラー

 

Example of use

 

Made to order product

 

 

 

Large magnet stand (LV-0030)

 

 

This is the exclusive magnet stand for sensor suspension. Free laser radiation is available with two joints. Assembly with the LV-0015/0016 XY-axis fine-control stage enables the minute position adjustment.

 

 

 

 

XY-axis fine-control stage (LV-0015)

 

 

Assembly with the LV-0030 Large magnet stand enables minute position adjustment. Sample position adjustment is possible with individual use.

 

 

Stage face: 60×60 mm
Amount of travel: ±5 mm

 

 

 

 

Z-axis fine-control stage (LV-0016)

 

 

Precise up and down movement to the Z-axis direction is possible with this stage. Assembly with the LV-0030 Large magnet stand enables focusing of laser light or image, and minute position adjustment of horizontal direction.

 

Stage face: 60×60 mm
Amount of travel: 0 to 10 mm

 

 

 

 

Large tripod (LV-0017A)

 

 

The LV-0017A supports the sensor suspension which is in a place without surface plate or high position. Magnetized fixing of sensor or large magnet stand (LV-0030) is available.

 

 

Accessory
LV-0018A : Steal plate

製品写真(LV-0018 スチールプレート)

 

 

 

Connection kit (LV-0772)

 

*Main unit of LV-7100 is not included.

 

The LV-0772 connects two LV-7100 Laser Doppler Surface velocity meter controllers to make the detection of 2 channels simple. Simultaneous distance/ length reset of two units are available by connecting them.

 

 

 

 

Storage trunk (LV-0791)

 

In addition to the LV-7100 Laser Doppler surface velocity meter controller and the LV-7002 LDSV sensor, optional equipment including the large-sized magnet stand, 90-degree beam bending mirror, sensor suspension adapter, etc. can be stores in this dedicated storage trunk.



 

List of storable equipment

· LV-7002 × 1
· LV-7100 × 1
· LV-0703 or LV-0705 × 1
· LV-0030 × 1
· LV-0015 × 1
· LV-0016 × 1
· 90-degree beam bending mirror
· Sensor suspension adapter
· Instruction manual
· AC cable, etc.

 

 

Peripherals

Feature
・Number of pulses: Selectable from 120,200 and 1200 P/R
・Four kinds of output formats
・Totem-pole output (standard)
・Emitter output (option)
・Collector output (option)
・Open collector output (option)

 

 

 

Feature
・Multiple ratio selection, ratio compensation function, off set, decimal point selection, counting direction selection
・External output:
・Comparator
(Setting value: 4 kinds can be saved as conditions)
・Analog
・BCD
・RS-232C communication

 

 

Revised:2017/04/05



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