Title of Invention

AN APPARATUS FOR DETERMINING INTERNAL PROFILE OF A CLOSED COMPONENT

Abstract

a water tank (1) partially filled with water (6) and accommodating a closed componant(7) submerged in the water (6), an ultrasonic wave ganarator (2) also having a receiver disposed at a gap (6) from the closed component (7) being partially submerged in the water (6), the generator (2) being operable to transmit and receive sound wave via the water (6) at a direction perpendicular to the job (7), the receiver of the wave generator (2) configured to receive the echo generated by the sound wave reflecting back from an interface constituting the water (6) and an outer surface of the component (7), a first travel time of the first reflected wave being displayed in a display unit (5); the display unit (5) additionally displaying the echo generated by the transmitted wave and reflected back from an interface constituting an inner surface of the component (7) and the air or water, a second travel time for the second reflected wave received at the receiver (2) before being displayed in the display unit (5); characterized in that displayed data relating to the first travel time of the first reflected wave and to the second travel time of the second reflected wave multiplied respectively to the velocity of sound in the water and the velocity of sound in the material of the component (7) to arrive at a first and second distance (L1,L2) and wherein the first and second distances (L1,L2) repeatedly are determined at different circumferential positions of the component (7) in submerged mode till all the points are covered all around the job and determining the inner surface profile of the component (7).

Full Text

FIELD OF INVENTION The invention relates to an apparatus for determining internal profile of a closed component of identifying the thickness, outer profile and internal profile of a closed component such a pipe. BACKGROUND OF THE INVENTION Ultrasonic testing is a well established non-destructive testing method for evaluating the quality of raw material, semi-finished and finished products. Ultrasonic thickness measurement is also a standard method for evaluating the thickness of different materials. During the manufacture of various products such as tubes, hollow castings, pipes etc., there exists a requirement of identifying the internal profile of the product. U.S. Patent no. US5577088 discloses an invention which uses pulsed ultrasonic energy for examining the prismatic face of the internal profile of a tubular part so that all the internal dimensions are examined in one go. The cited patent publication describes a method for checking the quality of the cladding of the part which is prismatic in shape. GB Patent no. GB1536102 describes an invention which relates to identification of a position defect inside an object and presenting the image of the same. Russian Patent no. RU2149394 describes an invention which utilizes two pulse trains sent through a liquid medium and evaluates condition of the pipe including defects and anomalous zones if any in the material after calculating the time taken for the transit including local reflection. Japanese patent JP61090052 relates to automatic detection including alignment of different diameter part of the internal surface of a pipe by providing a lever. A changeover valve which switches a liquid according to the motion of the lever is provided. The force of the liquid expanding and contracting a probe for the automatic detection. US Patent no. US5431053 discloses a system which uses two ultrasonic transducers for acquiring the signals received with a test piece and a standard specimen. The received signals are analyzed and compared and images are ultrasonically produced to determine the difference. OBJECTS OF THE INVENTION It is therefore an object of the invention to propose a system for identifying the internal profile of a closed object. Another object of the invention is to propose a system for identifying the internal profile of a closed object which is totally non-destructive. A further object of the invention is to propose a system for identifying the internal profile of a closed object which comprises initial identification of the thickness and outer profile of the closed object by measurement. These and other objects and advantages of the invention will be apparent from the ensuing description. At the outset of the description, which follows, it is to be understood that the ensuing description only illustrates a particular form of this invention. However, such a particular form is only an exemplary embodiment and the teachings of the invention is not intended to be taken restrictively. SUMMARY OF THE INVENTION Accordingly, there is provided an apparatus for determining internal profile of a closed component, in particular internal profile of a tubular shaped component, comprising: a water tank partially filled with water and accommodating a closed component submerged in the water, an ultrasonic wave generator having a receiver disposed at a gap from the closed component being partially submerged in the water, the generator being operable to transmit and receive sound wave via the water at a direction perpendicular to the job, the receiver of the wave generator configured to receive the echo generated by the sound wave reflecting back from an interface constituting the water and an outer surface of the component, a first travel time of the first reflected wave being displayed in a display unit; the display unit additionally displaying the echo generated by the transmitted wave and reflected back from an interface constituting an inner surface of the component and the air or water, a second travel time for the second reflected wave received at the receiver before being displayed in the display unit; wherein the displayed data relating to the first travel time of the first reflected wave and to the second travel time of the second reflected wave are multiplied respectively to the velocity of sound in the water and the velocity of sound in the material of the component to arrive at a first and second distance; and wherein the first and the second distances are determined at different positions of the component in submerged mode to determine the inner surface profile of the component. BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWING Figure 1 - Shows an embodiment of the apparatus according to the invention. DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION As shown in figure 1, a job (7) is placed in a water tank (1) filled with water (6), and an ultrasonic wave generator (2) is placed in the water tank (1) maintaining a gap (G) between the ultrasound wave generator (2) and the job (7) such that a generated wave is injected in the water (6) at an angle perpendicular to the job (7). When the ultrasound wave hits an interface of the water and the job (7), in particular at an outer surface of the job (7), a part of the sound wave is reflected back and the balance is transmitted into the job (7). The generator / receiver (2) receives the first reflection and an echo is displaced on a display unit (5). By measuring a time taken by the transmitted wave for its travel through water (61 and multiplying the time with the velocity of sound in water, a water distances determined. The transmitted sound wave further travels into the job (7) and an inner surface where water or air is present, the sound is reflected back. The reflected sound is picked up by a receiver part of the wave generator (2) and is displayed in the display unit (5). The distance (L2) is measured from the display unit (5) by measuring the time and multiplying the velocity of sound in the job (7). During the successive relation of the job (7) through 360 degrees in steps, the above process is repeated and the distance L1 and L2 are repeatedly calculated. Thus, the outer surface profile and the thickness of the job (7) measured. By drawing the lines corresponding to different values of L1 and L2 at different locations through polar coordinates, the inner surface and outer surface profile are determined for the job (7). An ultrasound pulser (4) is operably connected at one end to the wave generator (2) and to the display unit (5) via an interconnecting cable (3). A rotating means to rotate the job (7) is optionally provided. 1 An apparatus for determining internal profile of a closed component, in particular internal profile of a tubular shaped component, comprising: - a water tank (1) partially filled with water (6) and accommodating a closed component (7) submerged in the waiter (6), - an ultrasonic wave generator (2) also having a receiver disposed at a gep (G) from the closed component (7) being partially submerged in the water (6), the generator (2) being operable to transmit and receive sound wave via the water (6) at a direction perpendicular to the job (7), the receiver of the wave generator (2) configured to receive the echo generated by the sound wave reflecting back from an interface constituting the water (6) and an outer surface of the component (7), a first travel time of the first reflected wave being displayed in a display unit (5); - the display unit (5) additionally displaying the echo generated by the transmitted wave and reflected back from an interface constituting an inner surface of the component (7) and the air or water, a second travel time for the second reflected wave received at the receiver (2) before being displayed in the display unit (5); characterized in that displayed data relating to the first travel time of the first reflected wave and to the second travel time of the second reflected wave multiplied respectively to the velocity of sound in the water and the velocity of sound in the material of the component (7) to arrive at a first and second distance (L1, L2) and wherein the first and second distances (L1,L2) repeatedly are determined at different circumferential positions of the component (7) in submerged mode till all the points are covered all around the job and determining the inner surface profile of the component (7). 2 The apparatus as claimed in claim 1, comprising a typical driving arrangement for rotating the component (7) within the water tank (1), and wherein, the rotating arrangement is fixed to a support structure disposed outside the water tank (1) and connected with the component by a coupler. 3 An apparatus for determining internal profile of a closed component, in particular internal profile of a tubular shaped component as herein substantially described and illustrated with reference to the accompanying drawing. a water tank (1) partially filled with water (6) and accommodating a closed componant (7) submerged in the water (6), an ultrasonic wave ganarator (2) also having a receiver disposed at a gap (6) from the closed component (7) being partially submerged in the water (6), the generator (2) being operable to transmit and receive sound wave via the water (6) at a direction perpendicular to the job (7), the receiver of the wave generator (2) configured to receive the echo generated by the sound wave reflecting back from an interface constituting the water (6) and an outer surface of the component (7), a first travel time of the first reflected wave being displayed in a display unit (5); the display unit (5) additionally displaying the echo generated by the transmitted wave and reflected back from an interface constituting an inner surface of the component (7) and the air or water, a second travel time for the second reflected wave received at the receiver (2) before being displayed in the display unit (5); characterized in that displayed data relating to the first travel time of the first reflected wave and to the second travel time of the second reflected wave multiplied respectively to the velocity of sound in the water and the velocity of sound in the material of the component (7) to arrive at a first and second distance (L1,L2) and wherein the first and second distances (L1,L2) repeatedly are determined at different circumferential positions of the component (7) in submerged mode till all the points are covered all around the job and determining the inner surface profile of the component (7).

Documents:

427-KOL-2005-FORM-27-1.pdf

427-KOL-2005-FORM-27.pdf

427-kol-2005-granted-abstract.pdf

427-kol-2005-granted-claims.pdf

427-kol-2005-granted-correspondence.pdf

427-kol-2005-granted-description (complete).pdf

427-kol-2005-granted-drawings.pdf

427-kol-2005-granted-examination report.pdf

427-kol-2005-granted-form 1.pdf

427-kol-2005-granted-form 18.pdf

427-kol-2005-granted-form 2.pdf

427-kol-2005-granted-form 3.pdf

427-kol-2005-granted-gpa.pdf

427-kol-2005-granted-reply to examination report.pdf

427-kol-2005-granted-specification.pdf