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Patent
Tohoku University, IHI Corporation and Ihi Inspection And Instrumentation Co. | Date: 2014-01-15

The fuel physical property determination method relating to the first aspect of the present invention includes: a test fuel flame-imaging step of obtaining imaging data by imaging flames formed by supplying a pre-mixed gas containing a test fuel and an oxidant agent, to a test tube in which an internal flow path thereof has a diameter set smaller than a flame-quenching distance at normal temperature; and a physical property determination step of determining a physical property of the test fuel by comparing the imaging data obtained in the test fuel flame-imaging step and imaging data obtained by imaging flames ignited by supplying a pre-mixed gas containing a standard-mixed fuel and an oxidant agent, to the test tube, the standard-mixed fuel having a known physical property.


Sugimoto T.,Toin University of Yokohama | Abe T.,IHI Inspection and Instrumentation Co.
Japanese Journal of Applied Physics | Year: 2011

We propose a new detection method for buried objects using the optimum frequency response range of the corresponding vibration velocity. Flat speakers and a scanning laser Doppler vibrometer (SLDV) are used for noncontact acoustic imaging in the extremely shallow underground. The exploration depth depends on the sound pressure, but it is usually less than 10cm. Styrofoam, wood (silver fir), and acrylic boards of the same size, different size styrofoam boards, a hollow toy duck, a hollow plastic container, a plastic container filled with sand, a hollow steel can and an unglazed pot are used as buried objects which are buried in sand to about 2 cm depth. The imaging procedure of buried objects using the optimum frequency range is given below. First, the standardized difference from the average vibration velocity is calculated for all scan points. Next, using this result, underground images are made using a constant frequency width to search for the frequency response range of the buried object. After choosing an approximate frequency response range, the difference between the average vibration velocity for all points and that for several points that showed a clear response is calculated for the final confirmation of the optimum frequency range. Using this optimum frequency range, we can obtain the clearest image of the buried object. From the experimental results, we confirmed the effectiveness of our proposed method. In particular, a clear image of the buried object was obtained when the SLDV image was unclear. © 2011 The Japan Society of Applied Physics.


Nakajima T.,IHI Inspection and Instrumentation Co.
Proceedings of the 5th European Workshop - Structural Health Monitoring 2010 | Year: 2010

This report shows the test result to be evaluated the frequency characteristic of fiber Bragg gratings (FBG) sensors using a single Hopkinson's bar. The Hopkinson's bar is a thin stainless bar of which the diameter is 30mm and the length is 2m. The elastic pulse wave, which propagates along the bar, was measured as strain using two FBG sensors and two types' semi-conductor strain gages. The measured strains by the sensors were good match in both time and frequency domain. The result shows that FBG sensors are available to measure very fast dynamic strain up to 100 kHz. The measurement system for FBG sensors would be effective to monitor and to evaluate fatal damages of structures that run at high velocity like aircrafts and launch vehicles and are equipped with sub-systems, which are operating at fast speed like jet engines.


Patent
Ihi Inspection And Instrumentation Co. | Date: 2010-02-12

A testing method using a guided wave generates a guided wave to propagate through a subject as a testing target in a longitudinal direction of the subject, detects a reflected wave of the guided wave and examines the subject on the basis of the reflected wave. The testing method includes the steps of (A) obtaining data for defect amount estimation beforehand indicating a relationship between a defect amount of the subject and a magnitude of a reflected wave, (B) generating a guided wave so as to propagate through the subject, and detecting a reflected wave of the guided wave, and (C) estimating a defect amount of the subject on the basis of the data for defect amount estimation obtained at (A) and the magnitude of the guided wave detected at (B).


Patent
Ihi Inspection And Instrumentation Co. | Date: 2010-05-11

An L-mode guided wave sensor 10 for inspecting an inspection target by using an L-mode guided wave. The L-mode guided wave sensor 10 is provided with a vibrator 3 which is attached to an inspection target 1, and a coil 5 which is wound around the vibrator 3 and to which an AC voltage is applied. The vibrator 3 is made of a ferromagnetic material.


Patent
Ihi Inspection And Instrumentation Co. | Date: 2013-03-06

An L-mode guided wave sensor 10 for inspecting an inspection target by using an L-mode guided wave. The L-mode guided wave sensor 10 is provided with a vibrator, 3 which is attached to an inspection target 1, and a coil 5 which is wound around the vibrator 3 and to which an AC voltage is applied. The vibrator 3 is made of a ferromagnetic material.


Patent
IHI Inspection and Instrumentation Co. | Date: 2015-02-19

An ultrasonic transmitter 3 attached to an inspecting target object 1, an ultrasonic receiver 5 receiving a reflected wave of the ultrasonic wave that has propagated from the ultrasonic transmitter 3 in the inspecting target object, a data processing device 7 acquiring position specifying data for specifying a position of a defect 1a in the inspecting target object 1 on the basis of received data representing a waveform of the reflected wave received by the ultrasonic receiver 5 are provided. The ultrasonic wave generated by the ultrasonic transmitter 3 has been frequency-modulated, and has a waveform composed of components of respective frequencies that are deviated from a resonance frequency of the ultrasonic transmitter 3 and the ultrasonic receiver 5. The data processing device 7 includes a pulse compressing unit 21 performing pulse compression on the received data, and acquires the position specifying data on the basis of the pulse-compressed received data.


Patent
Ihi Inspection And Instrumentation Co. | Date: 2012-11-28

A testing method using a guided wave generates a guided wave to propagate through a subject as a testing target in a longitudinal direction of the subject, detects a reflected wave of the guided wave and examines the subject on the basis of the reflected wave. The testing method includes the steps of (A) obtaining data for defect amount estimation beforehand indicating a relationship between a defect amount of the subject and a magnitude of a reflected wave, (B) generating a guided wave so as to propagate through the subject, and detecting a reflected wave of the guided wave, and (C) estimating a defect amount of the subject on the basis of the data for defect amount estimation obtained at (A) and the magnitude of the guided wave detected at (B).


Patent
Ihi Inspection And Instrumentation Co. | Date: 2010-02-12

(A) first data for defect amount estimation for the guided wave of a first frequency is obtained, the data indicating a relationship among amplitude of the reflected wave, a defect cross-sectional area and a defect width. (B) second data for defect amount estimation for the guided wave of a second frequency is obtained, the data indicating a relationship among amplitude of the reflected wave, a defect cross-sectional area and a defect width. (C) a guided wave of the first frequency is generated, and amplitude of a reflected wave is detected as first amplitude. (D) a guided wave of the second frequency is generated, and amplitude of a reflected wave is detected as second amplitude. (E) on a basis of the first and second data and the first and second amplitude, a defect cross-sectional area and a defect width of the defect part are estimated.


Patent
Ihi Inspection And Instrumentation Co. | Date: 2012-11-28

(A) first data for defect amount estimation for the guided wave of a first frequency is obtained, the data indicating a relationship among amplitude of the reflected wave, a defect cross-sectional area and a defect width. (B) second data for defect amount estimation for the guided wave of a second frequency is obtained, the data indicating a relationship among amplitude of the reflected wave, a defect cross-sectional area and a defect width. (C) a guided wave of the first frequency is generated, and amplitude of a reflected wave is detected as first amplitude. (D) a guided wave of the second frequency is generated, and amplitude of a reflected wave is detected as second amplitude. (E) on a basis of the first and second data and the first and second amplitude, a defect cross-sectional area and a defect width of the defect part are estimated.

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