FIELD OF THE INVENTION
The invention generally relates to the field of non - destructive evaluation and characterization of materials for example, micro - structure and mechanical properties evaluation of semi - finished, finished flat / forged / cast steel products The invention further relates to non - destructive evaluation of surface as well as internal flaws in semi - finished, finished flat / forged / cast steel products as well as industrial components such as rolling mill rolls, shafts, pipes / tubes etc. More particularly, the invention relates to an effective and ergonomic ultrasonic probe device for ultrasonic testing of forged or cast steel products.
BACKGROUND OF THE INVENTION
Earlier, two separate ultrasonic probes, one transmitter and another receiver, were being used to produce and receive ultrasonic surface wave (Rayleigh / Lamb waves) for measurement of time of flight (TOF) of ultrasonic waves between them. For this, both the probes were being kept apart at a fixed distance holding them manually. This distance between the probes was measured with the help of a measuring device each time for a set of measurement. In this process, error in measurement of TOF occurs because a very slight variation in the measurement of distance between the probes is likely to cause a huge error in TOF measurement. Further, the manual process for keeping the probes apart at a fixed and accurate distance needs a lot of time and concentrations. Also holding the probes with both the hands is a unergonomical practice.

3
To avoid errors in measurement of TOF as well as saving time for accurate and precise measurement of TOF, there exists a need to develop a device / assembly which can be used effectively and economically.
OBJECTS OF THE INVENTION
It is therefore an object of the invention is to propose an effective and ergonomic ultrasonic probe device for ultrasonic testing of forged or cast steel products which eliminates the disadvantages of prior art.
Another object of the invention is to propose an effective and ergonomic ultrasonic probe device for ultrasonic testing of forged or cast steel products which can capture data in respect of the test object pertaining of the dead zone.
A further object of the invention is to propose an effective and ergonomic ultrasonic probe device for ultrasonic testing of forged or cast steel products which is capable of measuring the time of flight of ultrasonic waves between atieast two separate probe means.
A still further object of the invention is to propose an effective and ergonomic ultrasonic probe device for ultrasonic testing of forged or cast steel products which is capable for evaluation of surface including internal flaws in forged or cast steel products.

4 BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Figure 1 - Shows a photograph of the ultrasonic probes device of the invention in an use mode for measurement of TOF of ultrasonic surface wave (Rayleigh / Lamb waves).
Figure 2 - Shows a block diagram of the ultrasonic probe device of the invention. DETAILED DESCRIPTION OF THE INVENTION
As shown in Figure 2, a transparent and a light weight perspex sheet of size 200 x 30 x 10 mm arranged and two rectangular holes (Hi, H2) of size 30 x 16 mm are configured. These holes (H1, H2) are 100 mm apart from each other and 20 mm away from both the edges of the sheet (1). Two ultrasonic surface wave probes (3, 4) of 4 MHz frequency with crystal size 8x9 mm, one transmitter (3) and another receiver (4), with lemo connectors (5) are inserted and fixed with adhesive rigidly. The size of the ultrasonic probes (3, 4) is 30 x 16 x 22 mm. The position of the plane of the perspex sheet (1) is parallel to and 2 mm apart from the contact surface between the transducers (3,4) and the test piece (6).

5 We Claim
1. An effective and ergonomic ultrasonic probe device for ultrasonic testing
of forged or cast steel products, comprising:
- atleast two transducers (3, 4), one of the atleast two transducers
(3, 4) being a transmitter (3) and the other being a receiver (4),
the transducer being insertable in a persplex sheet (1) and
disposed over a test - piece (6); and
- the perspiex sheet (1) having a tieast two hoies (H1, H2) configured
at a predetermined distance, the persplex sheet (1) being
disposable at a plane parallel and spaced apart from a contact
surface between the test piece (6) and the transducers (3,4}

2. The device as claimed in claim 1, wherein the transducers (3, 4) each
having lemo connector (S).
3. An effective and ergonomic ultrasonic probe device for ultrasonic testing
of forged or cast steel products as substantially described herein with
reference to the accompanying drawings.
Dated this 5th day of JUNE 2006
(P.D. GUPTA) /
of L S DAVA* & CO,, Applicants' kgint