Checking Performance Test for Fresh Sub Assembly Inspection Facility (FSIF) Elevation Using Optical

INTERNATIONAL JOURNAL FOR TRENDS IN ENGINEERING & TECHNOLOGY

VOLUME 3 ISSUE 1 –JANUARY 2015 - ISSN: 2349 - 9303

Checking Performance Test for Fresh Sub Assembly Inspection Facility (FSIF) Elevation Using Optical System T.Bhuvaneswari National Institute of Technology, Tiruchirappalli, India Department of Electronics and Communication Engineering bhuvaneswariarasu@gmail.com

Dr.D.Sriram Kumar National Institute of Technology, Tiruchirappalli, India Department of Electronics and Communication Engineering srk@nitt.edu

Abstract—The Checking of performance test for the system of Fresh Subassembly Inspection Facility (FSIF) at elevation 21M in the fuel building of Prototype Fast Breeder Reactor (PFBR) with the inspection of straightness checking of Fresh Sub Assembly (FSA) is being measured using the Optical system. A device for measuring the profile of a Fresh Sub Assembly (FSA) uses three expanded planar laser beams, each of the planar beams relatively disposed at angle of 45° and directed towards the FSA. Respective photocells are arranged to be illuminated by the beams after passing through the deviated body. If the FSA is deviated from its position then the relative movement is effected between the FSA and the laser beams.

Index Terms— Planar Laser beams, Fresh Sub Assembly, Photo detector, Plurality of heights.

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1 INTRODUCTION

T

HE Fresh Sub Assembly Inspection Facility (FSIF) is a system used for identification and inspection of fresh SA before loading into the reactor. Each Sub assembly is primarily designed for particular flow zone in the reactor. FSIF consists of a dimensional inspection set up, measuring the straightness of sub assembly from deviation is checked up using Optical system before loading into the reactor. The Dimensional inspection setup consists of a bottom support structure, which holds the foot of the Sub assembly in vertical direction in a sleeve. This support structure rests on the floor on its flanges. Using the optical system with the source of planar laser beam, Inspection is made by checking the straightness of the Fresh Subassembly which is being sensed at the sensing distance of 2.5mm from deviation.

Camera Motor Parameters: 1) Input Voltage: 238v AC, 50Hz Supply, 2) Current drawn: 130 mA.

3 FOOT PROFILE INSPECTION Sub Assembly foot profile Upper zone identification mechanism (X) and Lower zone identification mechanism (Z) is checked by a diametrically opposite two sets of measuring heads on the bottom structure. The absolute values for the foot profile LVDT’S are available in control panel. The foot profile measurement details: X=79.96, Z=54.64.

TABLE 1

2

IDENTIFICATION ON SUB ASSEMBLY USING CAMERA ROTATION

Rotation mechanism for the camera is checked by a powering drive motor mounted on the mechanism. The motor is rotated up to the end limits. The end limits were checked by a limit switches mounted on the structure. It is found that motor supply is cut off by an end limit switches actuation.

Camera Motor Name plate details: 1) Vishal_sync, Serial: 9116.

2) Synchronous speed: 60 RPM. 3) Rated Torque: 10.

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FOOT PROFILE INSPECTION OF FSA. With SA

Without SA Sl. LVDT 1(Lower)

LVDT 2(Upper)

LVDT 1(Lower)

LVDT 2(Upper)

1

44.68

67.61

54.22

79.88

2

44.63

67.48

54.18

79.80

No

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VOLUME 3 ISSUE 1 –JANUARY 2015 - ISSN: 2349 - 9303 4 FSA SEATING CHECKING The Sub assembly check up limit switch is accurate when the sub assembly rest on the bottom support structure. The Sub Assembly is rested on the bottom structure the limit switch is adjusted to actuate.

It is found that seating check up sensing indication available in control panel.

5 EXISTING STRAIGHTNESS CHECKING After the lowering of Sub assembly in to the dimensional setup, a cylindrical gauge is inserted into the head of the sub assembly from the top of the cell manually. A proximity switch located at the bottom of the top sleeve sensed the straightness gauge. Setting of the proximity switch is done by adjusting the sensing the length, when the straightness gauge is inserted into the top sleeve without Sub Assembly.

Proximity switch parameters: Supply voltage: 24V DC Sensing distance: 5mm.

Referring to Fig.1 there is shown a laser 1 generating a cylindrical beam Fl which is directed to illuminate a cylindrical lens 2. Lens 2 has a diameter which is slightly larger than that of beam F1 and a cylindrical length substantially equal to the beam diameter. Lens 2 is located at the focus of a thin converging lens 3 having a width substantially equal to the length of cylindrical lens 2. Lens 2 in effect, provides an expanded beam F2 which illuminates lens 3, which in turn effectively converts the beam F2 into a planar parallel beam F3. The width of lens 3 is small with respect to its height such that beam F3 is equivalent to a planar beam.

In Fig.2. there is shown in plain view, three planar laser beam generating means of the type just disclosed, including respective lasers 4,5 and 6 of the continuous emission type, cylindrical lenses 7, 8 and 9 and thin lenses 10, 11 and 12.

1.

ed, followed by a period.

5.1 Concept Flow Laser Beam A system utilizing a plurality of laser beams relatively disposed in a vertical plane. A relative motion in a horizontal direction is affected between the beams and the FSA, such that the FSA passes through the beam and effectively masks photoelectric detectors disposed to receive the beams. The photoelectric detectors enable pulse counters during the period they are shut off from the beam by the object. The pulses are generated in accordance with the relative motion of the object and light beam. The measurement by means of one or more vertically disposed planar light beams, obtained from a laser and photoelectric detectors which are vertically movable within the plane of the beam.

The optical systems include a cylindrical lens disposed at the focus of a converging thin lens, the cylindrical lens having an axis at right angles with the laser beam. The device includes three vertical planar laser beams intersecting at a vertical segment and cooperating with a single array of detectors.

Fig. 2. Diagrammatic view of a profile control device with three planar laser beams.

Fig.1. Generation of a planar laser beam

IJTET©2015 Fig. 1. Magnetization as a function of applied field. Note that “Fig.” is abbreviated. There is a period after the figure number, followed by one space. It is good practice to briefly explain the significance of the figure in the caption.

Lasers 4, 5 and 6 and lenses 7-12 operate to produce respective planar beams F4 F5 and F6. Planar beams F4, F5 and F6 are vertically disposed and intersect at a vertical segment P. Beams F4 and F6 are disposed at 45° with respect to beam F5. A horizontal movable support member 13 is arranged at a right angle with beam F5 and supports conventional photo detector cells which Fig. 1.three Magnetization as a function of applied field.

Note are thatarranged “Fig.” is abbreviated.

There is a period afterand theF4 figure number, and followed by to be illuminated by beams F6, F5 respectively shutting space. It is good practice to briefly explain the significance of the out one the beams from the associated cells 14-16.

The time periods during figure in the caption. which FSA blocks or shuts out light beams F4, F5 and F6 from cells 16, 15 and 14 are respectively proportional to the diameters M1 N1, M2 N2 and M3 N3 of the cross-sections of the object in the horizontal plane containing the cells. The shut out periods are measured by counting of periodic pulses, the accuracy in determined by the intermediate profile.

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VOLUME 3 ISSUE 1 –JANUARY 2015 - ISSN: 2349 - 9303 The polygonal mirror is rotated at high speed, so that a line scan is performed with a high frequency between 100-1000 Hz. Due to the modulation of the laser beam in the MHz regime, each data point provides is between 100 to 1000 pulses to be collected and subsequently integrated.

5.4 Measurement of Deviation

Fig. 3. Perspective view of a movable mechanical supporting unit for the three Photo detectors.

Fig.1. Generation of a planar laser beam In Fig.3 a mechanism for adjusting the cells 14-16 to various predetermined heights within the respective planes of beams F4, F5 and F6. A support member 13, having mounted there on photo detectors 14-16 is adapted to slide on two vertically disposed slide bars, 19 and 20. Detector 15 is centrally located having an optical axis directed perpendicular to the front face of member 13, while detectors 14 and 16 are mounted having respective optical axis disposed at 45° with respect to the front face. An adjustable knob 21 controls rotation of two pinions Magnetization a function applied field.

Note that “Fig.”bars is 22,Fig. 23 1. which mesh withasracks 24, 25ofrespectively secured to slide abbreviated. There is a period after the figure number, followed by one 19 space. and 20.It The common axle of pinions 22, 23 and the axle of knob 21 is good practice to briefly explain the significance of the figure areinmounted in member 13. the caption.

Another adjustable control knob controls the clamping screw, the end of which provides locking of the position of member 13 on the slide bar. It should be appreciated that the pinions 22, 23 and clamp can be controlled to adjust member 13 sequentially to a plurality of predetermined heights in accordance with a preset program by a computer controlled automatic mechanism.

The distance information of an FSA is based on optical devices of a device operating on the principle of structured light triangulation would require on the one hand a laser imaging system with a beam splitter and on the other hand a further arrangement of four mirrors.

The Optoelectronic system has a laser transmitter and also comprises a receiving device for receiving light that has been reflected from the FSA. The laser transmitter and the receiving device are located coaxially, for optically splitting of laser scan sector to obtain multi-perspective imaging of FSA, where the Time of Flight technique is used with modulated beams. Optical splitting comprises an arrangement of optical mirrors whose mirror-surfaces are correspondingly facing each other under a predefined angle.

5.2 Straightness Checking of FSA An Optoelectronic system includes an illumination device which sends light towards the object and a receiving device which receives light reflected from the object. The apparatus includes means for optically splitting the field of view of the Optoelectronic sensor system into a plurality of sectors. Each of these sectors covers at least a partial view of the object under inspection from a unique viewing point. The arrangement of the optical splitting means is selected so that based on the respective field of view.

5.3 Polygonal Mirror Unit A polygonal mirror unit receives laser light and reflects it in a fanshaped form toward a stationary angled mirror unit, which directs the light towards a double-curved stationary mirror unit which reflects the beam onto the FSA. The individual mirrors of the polygonal unit are adjustable.

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Fig. 4. Cross sectional view of Structural Arrangement

5.5 Parallel and Titled Mirror Arrangement The first mirror and second mirror are tilted out of a horizontal plane, deflecting the light from the central area between the mirrors the lower part the mirror arrangement, the“Fig.” central Fig. 1.inMagnetization as aoffunction of applied field. Note that field view is removed.

For titled arrangement of two is of abbreviated.

There is a period aftermirror, the figure number, followed by onewith space.

It is that goodplaces practicethe to briefly theout significance mirrors a tilt upperexplain mirror of a plane figure in the caption. thatofistheperpendicular to the optical plane, avoids masking of field of view.

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VOLUME 3 ISSUE 1 –JANUARY 2015 - ISSN: 2349 - 9303

Fig. 5.Graphical representation of Sensing distance Vs Voltage without Deviation of FSA Fig.7.Parallel Mirror Arrangement.

6 RESULT AND DISCUSSION 1) Fresh Sub assembly are brought under inspection is removed from the cask and is positioned on the pit dimensional inspection set up using FSTG. 2) The power to the control panels LCPFB are switched ON 3) Visual examination of the surface of Sub assembly is done by Fig. 1. Magnetization as aCCTV functionmonitor. of appliedIffield.

Note that observing the images on required, the“Fig.” camera is abbreviated.

There is a period after the figure number, followed support platforms can be moved using pan facilities. by one space. It is good practice to briefly explain the significance 4) Serial number the sub assembly is manually fed into the of the figure in theofcaption. application program on the panel.

5) Using the vernier depth gauge, the level of the head of the sub assembly is measured from the top flange of the pit. This gives the length of the subassembly. Thus noted value of the length is manually is fit to the application program.

6) A straightness checking of three planar laser beams are passed to the sub assembly an illumination device comprising a laser transmitter.

7) A device for receiving light that has been reflected from the object, the receiving device having a field of view, such that the laser transmitter and the receiving device are located with the laser scan sector overlapping the field of view.

8) The optical splitting means arranged for shared use by the illumination device and the receiving device, in order to maximize an area of the object surface that is visible from at least one of the viewing points and means for causing the scanner device to sweep the laser beam over the object.

9) The lamp Sub assembly Straight comes ON, if the straightness checking is being performed and analysed from the deviation.

10) The accurate measurement are made with field view analyse, at minimum deviation of 2.5mm is measured at supply voltage of 25V DC supply.

Fig. 1. Magnetization as a function of applied field. Note that “Fig.” is abbreviated. There is a period after the figure number, followed by one space. It is good practice to briefly explain the significance of the figure in the caption.

Fig.6. Graphical representation of Sensing distance Vs Voltage with Deviation of FSA at sensing distance of 2.5mm.

Fig. 1. Magnetization as a function of applied field. Note that “Fig.” is abbreviated. There is a period after the figure number, followed by one space. It is good practice to briefly explain the significance of the figure in the caption.

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VOLUME 3 ISSUE 1 –JANUARY 2015 - ISSN: 2349 - 9303 7 CONCLUSION Using the optical system with the source of planar laser beam, Inspection is made by checking the straightness of the Fresh Subassembly which is being sensed at the sensing distance of 2.5mm from deviation.The different technique of mirror arrangement is used that deflects light from central area. Polygonal mirror is rotated at high frequency where the scanning is performed. Tilting of mirror at small angle cause the beam to sweep over the object. Upper and lower mirror are used is used to avoid shadowing of beam. The advantages of using the planar laser beams are, 1) Cost effective system with lower complexity.

2) Accurate Measurement.

3) Fast response.

4) Accurate deviation of FSA is computed from the pulse generated and it is determined at the Control System.

Supply Voltage: 24V DC. Sensing Distance: 2.5 mm.

REFERENCES [1] [2] [3] [4]

[5] [6] [7]

[8]

Shri Jose Varghese , “P&I Diagram for inspection of fresh sub assembly” ,PFBR/RG/35150/SP/2101 R-0.

Shri Jose Varghese, “Design specification for nitrogen Filling Facility”, PFBR/RG/35150/SP/1001 R-B. Shri Jose Varghese , “General Assembly of fuel sub assembly” PFBR/RG/31110/SP/1300 R-6.

Shri Jose Varghese , “Technical specification for manufacture of Fresh Sub Assembly Inspection Facility” PFBR/RG/35141/SP/1070 R-0.

Shri Jose Varghese , “Shri D.Rengaswamy,“Specification for manufacture of F SA PFBR”, PFBR/RG/35141/SP/1007 R-0.

General Assembly of control and safety rod sheath PFBR/RG/35141/SP/1070 R-0.

Shri Jose Varghese , “Shri D.Rengaswamy, “Dimensional specification of Fresh sub Assembly”, PFBR/RG/35141/SP/1170 R-0.

M. Hain E. Kawate, Nan electronics Research Institute, IEEE,” An Optical Method for the Measurement of Shape Deviations of Elliptical Mirrors”, Volume 7, Section 3, No. 2, 2007.

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