Lazoc is Structural Condition Monitoring company

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2008-06-26T13:02:39Z

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Enquiry

2008-06-26T12:59:09Z

Head office
Tel	81-3-3816-3864
Fax	81-3-3816-3867
IP Phone	81-50-8004-6273
mail	info@lazoc.jp

To-dai Lab
Tel	81-3-5841-2337
Fax	81-3-5841-2337

Access

2008-06-26T12:54:19Z

To Head office

- 5 minutes walk from Hongo-Sanchome station via Marunouchi-line (Tokyo Metro) or Ooedo-line (Toei)
- 10 minutes walk from Yushima station via Chiyoda-line (Tokyo Metro)
- 2 minutes walk from Tatsuoka-mon bus-stop via Ueno-Todai-Konai line

To The University of Tokyo Lab

- 5 minutes walk from Nedu station via Chiyoda-line (Tokyo Metro)
- 8 minutes walk from Todaimae station via Nanboku-line (Tokyo Metro)
- 2 minutes walk from final bus-stop via Ueno-Todai-Konai line

Company

2008-06-26T12:51:08Z

Name	LAZOC Incorporated
Capital paid-up	Japanese Yen 89,490,293
Establishment	April 15, 2002
CEO	Yuichi Machijima
Business	Development and Engineering of Fiber optical sensing system Field Service for Structural Monitoring System
Address	Head office Postal code : 113-0033 3-40-9, Hongo, Bunkyo, Tokyo, Japan Tel : 81-3-3816-3864 Fax : 81-3-3816-3867
Address	The University of Tokyo Lab Postal code : 113-8656 7-3-1, Hongo, Bunkyo, Tokyo The University of Tokyo, Hongo Campus, Engineering Faculty 3rd building Tel : 81-3-5841-2337 Fax : 81-3-5841-2337

Business

2008-06-26T11:36:30Z

The sensing technology is a nerve system, if we say with a human body. It is essential that infrastructure and plants are always healthy, to spend safe life and to realize economic activity. Social assets Civil infrastructure are aging gradually, and meeting with natural disaster frequently ever. Repair/renewal cost of those assets are too huge to spend, so extension of asset life is unavoidable. Prioritization of such work, i.e. when to repair, is also in a big task.

Industrial assets

Industrial plants/equipments are also aging and facing lack of maintenance people, while management squeezes to cut cost for maintenance. To minimize shutdown and to fulfill corporate social responsibility for safety and environment, in-service-inspection is on focus to be sure of where and when to be repaired.

Micromechanics

For a rapid growth of micro/nano process industry, quality control of how to mass-produce is being discussed. Not only core process technology, but production environment monitor, such as temperature and vibration, are becoming critical. To solve those problems, we provide the state-of-the-art monitoring technology. ]]>

Fiber Optical Doppler Sensor (FOD)

2007-11-15T05:08:39Z

FOD sensor can detect ultrasonic wave (vibration at the same time) that cannot be heard by human ear. Conventionally, several kinds of ceramics are used, where FOD can compete. In material science, by hearing very small ultrasonic, material destruction process is observed from micro crack till further degradation. fo is emitted into a corresponding fiber optic region, change in length of fiber optic causes a laser frequency modulation, because the number of light waves in that region is constant in a moment. In other words, the frequency modulates by fd because the light velocity is constant. This is called “Laser Doppler effect” that the frequency of light wave transmitted from other part is given “fo - fd”. The frequency modulation fd is proportional to the velocity of fiber optical length, i.e., the displacement rate of attached region.

Frequency modulation by Doppler effect is described as formula below. fd as modulated frequency, λ as light wavelength, and dL/dt as displacement rate. The negative (-) indicates that the frequency modulation is opposite to displacement rate in terms of phase analysis (+),(-).

As shown in the formula above, the frequency modulation fd and the displacement rate dL/dt are proportional. The frequency modulation fd is detected using the heterodyne interferometry and is converted into the voltage V with the frequency/voltage converter. The relation between the converted voltage V and the displacement rate dL/dt is indicated in formula below including the proportional constant K.

Figure below shows the Laser Doppler Interferometry system. The laser with frequency fo is emitted and divided into the sensing optical path and detecting optical path. Where measured object has a certain displacement at sensing region dynamically, the length of optical path changes accordingly. Then the proportional frequency modulation fd occurs to the laser light, which is “fo - fd”. At detecting optical path, frequency fM (80 MHz) is added by AOM (Acousto Optical Modulator) to create the frequency “fo + fM”. The difference in frequency given as “fM + fd” is converted into the voltage.

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Electro-Magnetic Acoustic Transducer / FOD system (EMAT/FOD)

2007-11-15T05:08:03Z

By combining FOD and magnetic, metal thickness is measured. According to Flemming law, EMAT generates vibration into metal, where FOD sensor detects such vibration frequency. The strongest frequency is corresponding to metal thickness. d, wavelength of ultrasonic as λ, when the following formula is fulfilled, resonance occurs,

(n : integral)

Then reformulated as below,

Meanwhile, FOD sensor can detect in-plane vibration of metal, thus FOD can detect above resonant frequency and amplitude easily. EMAT (Electromagnetic Acoustic Transducer) is used as heat-proof ultrasonic exciter by Lorenz force. Where Lorenz force as F, eddy current as J, magnetic force as B, the following formula

By using F, ultrasonic wave is generated into metal, and voltage frequency is swept. At a certain thickness, ultrasonic comes into resonance and obtains the maximum amplitude, which is thickness-correlated.

Item
Material		Carbon steel, Stainless steel etc
Material	Range	5〜30mm
Spec	Resolution	±0.1mm
	Condition	Atmospheric
	temperature	0-200 degrees Celsius

Technical features

Conventional thickness measurement is 1) Time-based inspection 2) Shutdown inspection at accessible temperature by measuring one point to another 3) employment of much human power and time. By EMAT/FOD system, 1) Continual monitoring of thickness at important fixed points, 2) Permanent sensor probes inside the insulation 3) On-line monitoring even under high temperature operation 4) Cost savings from scaffolding, insulation disassemble and reassemble work

Applicable area

- Piping (elbow also) and pressure vessels ]]>

Fiber Bragg Grating Sensor (FBG)

2007-11-15T05:07:12Z

By making grating inside core of fiber optic, such grating shall reflect particular wavelength of laser, correlating to period of grating. Grating period expands or shrinks to strain and temperature change.

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Multiplexing methods by Frequency domain of FBG sensors (OFDR)

2007-11-15T05:06:35Z

FBG sensor is advantageous of being able to have many sensors in one line of fiber optic. To recognize the position of each FBG, there are several methods like WDM (wavelength division multiplex) and TDM (time division multiplex). OFDR (Optical Frequency Domain Reflectometry) is a third option, that can divide FBG by interferometric approach. OFDR makes possible to measure several hundreds of FBG and also to measure with less-than-1mm spatial resolution, both of those are impossible by WDM and TDM.

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Rotating machine diagnostic system by wide frequency methods of FOD

2007-11-15T05:06:05Z

Damage of rotating machine comes from bearing, shaft, etc that are represented from high frequency ultrasonic to low frequency vibration. By using FOD wide coverage of frequency (10Hz to 1MHz), preventive diagnosis is possible. Abnormality of rotating machine is defined as 1) Structure-related : unbalance, miss-alignment, shaft bend >> Low frequency signal below 1kHz 2) Impact-related : bearing damage >> High frequency signal above 1kHz FOD system can monitor such low and high frequency signal simultaneously due to its wide range coverage, i.e. AE and vibration. Monitoring FOD sensor permanently installed, while by connecting it to optical analyzer at regular maintenance cycle and obtaining AE and vibration data and analyze. ]]>

Scintillator with Optical Fiber (SOF)

2007-11-15T05:05:08Z

Conventionally, there are several methods to detect thermal neutron, such as Geiger-Muller. SOF is utilizing scintillation phenomena to detect thermal neutron which passes through sensor probe, and such scintillated light is led by fiber optic to photo-detector. Thermal neutron Range 10⁵〜10¹⁰　n/cm2/sec Power supply From USB　max 2.5W size 75mm x 60mm x 120mm weight 550g approx.

Technical features

1) Small sensor head (less than 1mm diameter) 2) Signal loss is minimum due to fiber optic transmission 3) Real-time monitoring is possible

Application area

1) Monitoring post at nuclear industry or survey meter 2) Beam monitor at irradiation from sealed source or accelerator ]]>

R&D Information

2007-11-15T04:59:22Z

We are on step by step to provide state-of-the-art technology which is from basic research to field-setup. Monitoring technology- Optical hydrophone
- Heat-proof and long-life fiber optic AE sensor
- Cryogenic-proof and long-life fiber optic AE sensor
- Fiber optic humidity sensor
- Fiber optical power-generation system

Application area

- Fiber optical micro seismic sensor for oil and gas industry - Non-electric Medical care monitoring system - Corrosion monitoring by fiber optic - Welded joint defect monitoring by fiber optic - Wind-turbine blade monitoring by fiber optic - Composite fabrication process monitoring by fiber optic ]]>

Published Papers

2007-11-15T04:57:50Z

Please refer to our presented papers at conference and symposium. Civil- FOD for Rock specimen ISRM2007 ：pdf 497KB （keyword）rock structure, fiber-optic doppler sensor, acoustic emission - FOD sensor to Rock Structure SCMAI2007：pdf 121KB （keyword） rock structure, fiber-optic doppler sensor, acoustic emission

Plant

- Corrosion Detection By Fiber Optic AE Sensor IAES2008 ：pdf 390KB （keyword） CUI(corrosion under insulation), IST(in-service inspection), fiber-optic AE sensor

Material

- CFRP Delamination Process Monitor ICCM2007：pdf 857KB （keyword）composite, fiber-optic doppler sensor, acoustic emission - Electric Pulse Discharge Monitor OFS2006 ：pdf 330KB （keyword）electric pulse discharge, fiber-optic doppler sensor, acoustic emission

OFDR

- OFDR OFS-18 ：pdf 125KB （keyword）distributed strain measurement, long FBG sensor, optical frequency domain

FOD

- Journal of Lightwave technology_2006April ：pdf 1.40MB （keyword）doppler-effect, fiber-optic sensor, principle

SOF for thermal neutron

- Thermal Neutron Nuclear Instruments and Methods(2005)：pdf 732KB （keyword）BNCT, SOF detector, online monitor]]>

Field Monitoring

2007-11-15T04:55:48Z

We provide “Monitoring Service” including planning, design, installation, monitoring, and data analysis for “Condition Monitoring” and “In Service Inspection” of civil infrastructure and industrial equipments. Methods of Field monitoring　

Acoustic Emission (AE)	When a solid is deformed or cracked, the micro elastic wave is produced, that is called Acoustic Emission. A solid destruction is foreseeable by observing AE. Ceramic (PZT) AE sensor, acceleration sensor, FOD sensor to serve.
Vibration	Abnormal vibration of the structure is observed. Acceleration sensor and FOD sensor to serve.
Rock stress	With an over-coring method, 3-axis stress on bedrock under the ground is measured. Special sonde which arranges strain gauge in the three dimensions mainly to serve.
Earthquake	Seismometer, Hydrophone, Slight-motion Seismograph, Long-period seismometer to evaluate soundness of the structure after big impact of earthquake.
Metal wall thickness	By EMAT / FOD system the online monitor of metal thickness at piping and pressure vessel is possible even under temperature 200 degrees Celsius.
Underwater sound	By detecting P wave in liquid, leakage or corrosion of the liquid container structure to be observed. FOD sensor to serve even under explosive environment.
Multi points strain	To monitor stress condition on important process equipments, multi-pointed sensors are arranged on single line of optical fiber. FBG and WDM, OFDR, or OTDR methods to be applied.
Continuous strain with less than 1mm pitch	Particular attention to micro stress changes occurred at important parts/devices. To confirm stress analysis with simulation model, this will help in time-saving. Less than 1mm spatially resolved strain will change engineering. FBG and OFDR to serve.
Temperature	To monitor temperature with multi point method, FBG WDM, and OFDR to be applied.
Displacement	By micro-wave displacement meter, direct displacement to be observed at structure or equipment.
Thermal neutron	Flux monitoring of thermal neutron at irradiation facility, nuclear industry by SOF.

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Products

2007-11-15T04:54:36Z

Fiber optical sensing system can measure strain, temperature, vibration, ultrasonic etc under a severe field condition. Optical sensing system by purpose

Merits of optical sensing system by purpose

Products

FOD system

FBG/WDM system

FBG/OFDR system

SOF system (sensor, detector, analyzer)

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