阅读说明：本技术 一种应用于光线偏振研究的测量装置 (Measuring device applied to light polarization research ) 是由 彭菊阳 于 2021-08-25 设计创作，主要内容包括：本发明公开了一种应用于光线偏振研究的测量装置,包括：安装架,放置在实验台上；检偏器,通过支撑架安装在安装架的一侧,可使得光线在通过检偏器后被分辨；波片,通过连接架安装在安装架上位于检偏器的一侧,可使得光线通过波片后被检偏器分辨；传动组件,安装在支撑架与连接架之间,通过推动所述检偏器,可使得波片被推动至检偏器同一水平面,进而使得检偏器与波片同步测试光线种类,本发明可以通过传动机构只转动检偏器就可以推动波片至待测位置,进而研究人员只需单手操作,操作较为简便,方便研究人员独立的光线偏振的研究。(The invention discloses a measuring device applied to light polarization research, which comprises: the mounting rack is placed on the experiment table; the analyzer is arranged on one side of the mounting rack through a support frame, so that light rays can be distinguished after passing through the analyzer; the wave plate is arranged on the mounting frame through the connecting frame and positioned on one side of the analyzer, so that light can be distinguished by the analyzer after passing through the wave plate; the transmission assembly is arranged between the support frame and the connecting frame, the wave plate can be pushed to the same horizontal plane of the analyzer by pushing the analyzer, and then the analyzer and the wave plate can synchronously test light types.)

1. A measuring device applied to light polarization research is characterized in that: the method comprises the following steps:

the mounting rack (1) is placed on the experiment table;

the analyzer (2) is arranged on one side of the mounting frame (1) through the support frame (3), so that light rays can be distinguished after passing through the analyzer (2);

the wave plate (4) is arranged on the mounting frame (1) and positioned on one side of the analyzer (2) through the connecting frame (5), so that light rays can be distinguished by the analyzer (2) after passing through the wave plate (4);

transmission assembly (7) is installed between support frame (3) and link (5), through promoting analyzer (2) can be so that wave plate (4) are promoted to the same horizontal plane of analyzer (2), and then make analyzer (2) and wave plate (4) test light kind in step.

2. A measuring device as claimed in claim 1, wherein: drive assembly (7) including installing ring gear (71) in analyzer (2) shell outside, rotatable being connected with pivot (72) in support frame (3), the one end of pivot (72) is equipped with and can be promoted and pivoted gear (73) by ring gear (71), the other end of pivot (72) is equipped with push pedal (12) that can promote wave plate (4) shell and insert in link (5), through promoting analyzer (2) for ring gear (71) promote gear (73) and rotate, and then make wave plate (4) promoted to link (5) in.

3. A measuring device as claimed in claim 2, wherein: link (5) are including installing mounting panel (51) at mounting bracket (1) top, the top of mounting panel (51) is equipped with track (52), the outside of wave plate (4) shell is equipped with go-between (10), wave plate (4) can insert in track (52) after rotating, slot (11) have been seted up on the surface of go-between (10), one side of push pedal (12) is equipped with picture peg (13) of being connected push pedal (12) go-between (10) relatively in can inserting slot (11), through with picture peg (13) insert between go-between (10) and push pedal (12) for push pedal (12) promote go-between (10) get into between two track (52).

4. A measuring device as claimed in claim 3, wherein: one side of the inserting plate (13) is provided with a connecting rope (14), the connecting rope (14) connects the inserting plate (13) on the push plate (12), so that the inserting plate (13) is not separated from the push plate (12) after the inserting groove (11) is pulled out.

5. A measuring device as claimed in claim 3, wherein: one side that track (52) are located picture peg (13) is equipped with ejection mechanism (8), ejection mechanism (8) are including installing displacement board (81) that can be promoted by connecting ring (10) between two track (52), one side of picture peg (13) is equipped with and can inserts picture peg (13) ejecting knock pin (82), knock pin (82) are connected in one side of track (52) through spring (83), the outside of knock pin (82) is equipped with kicking block (84), kicking block (84) are connected in one side of displacement board (81) through connecting plate (85), one side of kicking block (84) is equipped with the inclined plane, promotes through displacement board (81) kicking block (84) for kicking block (84) insert picture peg (13) with knock pin (82) in, and then make picture peg (13) break away from slot (11).

6. A measuring device for use in light polarization research according to any one of claims 1-5, wherein: one side of analyzer (2) shell is equipped with promotion post (15) that can the butt in the wave plate (4) shell outside, one side of wave plate (4) shell is equipped with and can be promoted and along with analyzer (2) pivoted auxiliary member (9) simultaneously by promotion post (15), auxiliary member (9) are including installing connecting axle (91) inside wave plate (4) shell, the outside of connecting axle (91) is equipped with slurcam (92), slurcam (92) are the V-arrangement setting, through promote post (15) and rotate to slurcam (92) position back, slurcam (92) rotate and with the opposite side perk of slurcam (92), and then make and promote post (15) under promoting behind the round can promote wave plate (4) rotation in step.

7. The measurement device as claimed in claim 6, wherein: the promotion board (92) all are equipped with magnet (93) of installing in wave plate (4) shell inside including promotion portion (921) and rotation portion (922) that are located promotion portion (921) one side, promotion portion (921) and one side of rotation portion (922), promotion board (92) are the steel sheet, promote rotation portion (922) and rotate through promoting post (15) for promotion portion (921) breaks away from magnet (93), rotation portion (922) laminating magnet (93), and then make and promote post (15) next round and can promote wave plate (4) and rotate.

8. A measuring device as claimed in claim 3, wherein: the rubber block (16) which can be pressed by the wave plate (4) shell and then abuts against the side face of the wave plate (4) shell is arranged in the track (52), and the rubber block (16) is arc-shaped.

9. A measurement device as claimed in claim 5, wherein: one side of the displacement plate (81) is provided with a guide post (17), and the guide post (17) can be inserted into the track (52).

Technical Field

The invention relates to the technical field of light polarization measurement, in particular to a measuring device applied to light polarization research.

Background

The interference and diffraction phenomena of light illustrate that light has a wave nature. The transverse wave nature of light is further confirmed by the polarization of light and birefringence phenomena in optically anisotropic crystals. The asymmetry of the vibration direction to the propagation direction is called polarization, which is the most obvious sign that transverse waves are distinguished from longitudinal waves, only transverse waves have polarization phenomena, and interference and diffraction are phenomena that various waves have, and both longitudinal waves and transverse waves generate interference and diffraction. Therefore, we often identify whether a substance or a form of motion is of a fluctuating nature, depending on whether interference or diffraction can occur. However, whether a certain wave is a longitudinal wave or a transverse wave cannot be discriminated by the phenomena of diffraction and interference. The difference between longitudinal waves and transverse waves is represented by another kind of phenomenon, namely polarization phenomenon, and light waves can be divided into 5 types of natural light, partially polarized light, linearly polarized light, circularly polarized light and elliptically polarized light according to polarization characteristics.

To the light polarization phenomenon, the researcher need measure its light, current measurement mode is through passing the light source that awaits measuring through the analyzer, what kind of polarized light is distinguished to the light luminance that forms through rotating the analyzer, to circular polarized light and elliptical polarized light, natural light and partial polarized light, must still add a 1/4's wave plate at the front end of analyzer, need rotate alone subsequently and rotate wave plate and analyzer simultaneously, thereby distinguish to the different luminance and the darkness of light, however, in the actual operation process, need insert the wave plate alone, rotate wave plate and analyzer simultaneously and rotate the analyzer alone, during the operation, need researcher's both hands difference operation respectively, it is comparatively troublesome to operate, inconvenient researcher independently researches light polarization. Therefore, a measuring device applied to light polarization research is provided.

Disclosure of Invention

The invention aims to provide a measuring device applied to light polarization research, and aims to solve the problems that operation is troublesome for personnel and research on light polarization is inconvenient for researchers.

In order to achieve the purpose, the invention provides the following technical scheme: a measurement device for use in light polarization studies, comprising:

the mounting rack is placed on the experiment table;

the analyzer is arranged on one side of the mounting rack through a support frame, so that light rays can be distinguished after passing through the analyzer;

the wave plate is arranged on the mounting frame through the connecting frame and positioned on one side of the analyzer, so that light can be distinguished by the analyzer after passing through the wave plate;

the light source frame is arranged on one side of the mounting frame, and the light source can be distinguished through the wave plate and the analyzer by placing the light source on the light source frame;

the transmission assembly is installed between the support frame and the connecting frame, and the polarization analyzer is pushed to the same horizontal plane of the polarization analyzer, so that the polarization analyzer and the wave plate synchronously test light types.

Preferably, drive assembly is including installing the ring gear in the analyzer shell outside, ring gear and analyzer shell fixed connection, rotatable being connected with pivot in the support frame, the pivot rotates with the support frame to be connected, and the link is passed in the pivot, and the pivot rotates with the link to be connected, the one end of pivot is equipped with can be promoted and pivoted gear by the ring gear, gear and ring gear meshing, gear and pivot fixed connection, the other end of pivot is equipped with the push pedal that can promote the wave plate shell and insert in the link, through promoting the analyzer for the ring gear promotes gear revolve, and then makes the wave plate promoted to the link in.

Preferably, the link is including installing the mounting panel at the mount frame top, the top of mounting panel is equipped with the track, the outside of wave plate shell is equipped with the go-between, the wave plate can insert in the track after rotating, the slot has been seted up on the surface of go-between, one side of push pedal is equipped with the picture peg of connecting the push pedal go-between relatively in can inserting the slot, through with between picture peg insert go-between and the push pedal for the push pedal promotes the go-between and gets into between two tracks.

Preferably, one side of the inserting plate is provided with a connecting rope, and the inserting plate is connected to the push plate through the connecting rope, so that the inserting plate is not separated from the push plate after the inserting groove is pulled out.

Preferably, one side that the track is located the picture peg is equipped with ejection mechanism, ejection mechanism is including installing the displacement plate that can be promoted by the go-between two tracks, one side of picture peg is equipped with the ejecting knock pin of picture peg in can inserting the picture peg, the knock pin passes through spring coupling in orbital one side, the outside of knock pin is equipped with the kicking block, the kicking block passes through the connecting plate and connects the one side at the displacement plate, one side of kicking block is equipped with the inclined plane, promotes through the displacement plate the kicking block for the kicking block inserts the knock pin in the picture peg, and then makes the picture peg break away from the slot.

Preferably, one side of analyzer shell is equipped with the promotion post that can the butt in the wave plate shell outside, one side of wave plate shell is equipped with and can be promoted the post and along with analyzer pivoted auxiliary member simultaneously, the auxiliary member is including installing the connecting axle at the wave plate shell inside, the outside of connecting axle is equipped with the slurcam, the slurcam is the V-arrangement setting, through after the promotion post rotates to the slurcam position, the slurcam rotates and with the opposite side perk of slurcam, and then makes the promotion post can promote the wave plate rotation in step after promoting next round.

Preferably, the push plate includes the promotion portion and is located the rotation portion of promotion portion one side, promotion portion all is equipped with the magnetite of installing in the inside of wave plate shell with one side of rotation portion, the push plate is the steel sheet, promotes the rotation portion through promoting the post and rotates for promotion portion breaks away from the magnetite, and rotation portion laminating magnetite, and then make and promote the post next round and can promote the wave plate rotation.

Preferably, the track is internally provided with a rubber block which can be pressed by the wave plate shell and then abuts against the side face of the wave plate shell, and the rubber block is arc-shaped.

Preferably, one side of the displacement plate is provided with a guide pillar, and the guide pillar can be inserted into the track.

The invention has at least the following beneficial effects:

the wave plate is switched to the same horizontal position through the transmission mechanism, and then the analyzer and the shifting piece are used for synchronous light measurement, compared with the prior art, in the actual operation process, the wave plate needs to be inserted independently, the wave plate and the analyzer rotate simultaneously, and the analyzer rotates independently, so that during operation, two hands of a researcher need to be operated differently, the operation is troublesome, and the researcher can not conveniently and independently research light polarization.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a partial block diagram of the present invention;

FIG. 3 is a partial view of the drive mechanism of the present invention;

FIG. 4 is a bottom view of the wave plate position of the present invention;

FIG. 5 is a side view of a wave plate of the present invention;

FIG. 6 is a partial cross-sectional view of a wave plate of the present invention;

fig. 7 is a partial cross-sectional view of fig. 4.

In the figure: 1-a mounting frame; 2-an analyzer; 3-a support frame; 4-a wave plate; 5-a connecting frame; 51-a mounting plate; 52-track; 6-light source rack; 7-a transmission assembly; 71-a toothed ring; 72-a rotating shaft; 73-gear; 8-an ejection mechanism; 81-displacement plate; 82-knock pin; 83-a spring; 84-a top block; 85-connecting plate; 9-an auxiliary element; 91-a connecting shaft; 92-a push plate; 921-pushing part; 922-a rotation part; 93-a magnet; 10-a connecting ring; 11-a slot; 12-a push plate; 13-inserting plate; 14-connecting ropes; 15-pushing the column; 16-a rubber block; 17-guide pillar.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example one

Referring to fig. 1-7, the present invention provides a technical solution: a measurement device for use in light polarization studies, comprising:

the mounting rack 1 is placed on a laboratory bench, and equipment for optical experiments can be installed in the mounting rack 1;

the analyzer 2 is arranged on one side of the mounting frame 1 through the support frame 3, the support frame 3 is movably connected with the analyzer 2, the analyzer 2 can freely rotate on the support frame 3, the support frame 3 is fixedly connected with the mounting frame 1, light can be distinguished after passing through the analyzer 2, and part of light can be distinguished through the analyzer 2 which can freely rotate;

the wave plate 4 is arranged on the mounting frame 1 and positioned on one side of the analyzer 2 through the connecting frame 5, so that light rays can be distinguished by the analyzer 2 after passing through the wave plate 4, the wave plate 4 and the analyzer 2 are synchronously used, and various light rays can be distinguished;

the light source frame 6 is arranged on one side of the mounting frame 1, the light source can be distinguished through the wave plate 4 and the analyzer 2 by placing the light source on the light source frame 6, the light source frame 6 facilitates the fixation of the light source, and the light source frame 6 is fixedly connected with the mounting frame 1;

drive assembly 7 installs between support frame 3 and link 5, through promoting analyzer 2, can be so that wave plate 4 is promoted to the same horizontal plane of analyzer 2, and then makes analyzer 2 and wave plate 4 synchronous test light kind, through drive assembly 7, the researcher can rotate 2 rounds of back of analyzer, rotate wave plate 4 to with analyzer 2 same horizontal planes, make things convenient for researcher's independent operation.

The transmission component 7 comprises a gear ring 71 arranged outside the shell of the analyzer 2, the gear ring 71 is fixedly connected with the shell of the analyzer 2, a rotating shaft 72 is rotatably connected in the support frame 3, the rotating shaft 72 is rotatably connected with the support frame 3, the rotating shaft 72 penetrates through the connecting frame 5, the rotating shaft 72 is rotatably connected with the connecting frame 5, one end of the rotating shaft 72 is provided with a gear 73 which can be pushed by the gear ring 71 and can rotate, the gear 73 is meshed with the gear ring 71, the gear 73 is fixedly connected with the rotating shaft 72, the other end of the rotating shaft 72 is provided with a push plate 12 which can push the shell of the wave plate 4 to be inserted into the connecting frame 5, the push plate 12 is fixedly connected with the rotating shaft 72, the gear 73 is pushed by pushing the analyzer 2 to rotate, the wave plate 4 is pushed into the connecting frame 5, the analyzer 2 is rotated, the analyzer 2 rotates for one circle, the analyzer 2 measures the light for the first time, then, the analyzer 2 drives the gear ring 71 to rotate, the gear ring 71 drives the gear 73 to rotate, the gear 73 drives the rotating shaft 72 to rotate, the rotating shaft 72 pushes the push plate 12 to rotate, and the push plate 12 pushes the wave plate 4 to the position of the connecting frame 5, so that light passes through the wave plate 4 and then is measured by the polarization detector 2, and research of researchers is facilitated.

The connecting frame 5 comprises a mounting plate 51 mounted at the top of the mounting frame 1, the mounting plate 51 is fixedly connected with the mounting frame 1, a rail 52 is arranged at the top of the mounting plate 51, the lower edge of the rail 52 is in a downward bending shape, so that the wave plate 4 can be conveniently rotated to enter the rail 52, the rail 52 is fixedly connected with the mounting plate 51, the rail 52 can accommodate a shell of the wave plate 4, and further, the limitation after the shell of the wave plate 4 is conveniently rotated, a connecting ring 10 is arranged at the outer side of the shell of the wave plate 4, the connecting ring 10 is fixedly connected with the shell of the wave plate 4, the wave plate 4 can be inserted into the rail 52 after being rotated, a slot 11 is formed in the surface of the connecting ring 10, an inserting plate 13 which can be inserted into the slot 11 to relatively connect the connecting ring 10 of the pushing plate 12 is arranged at one side of the pushing plate 12, the inserting plate 13 is slidably connected with the connecting ring 10 and the pushing plate 12, and the connecting ring is inserted into the connecting ring 10 and the pushing plate 12 through the inserting plate 13 to keep an integrity with the pushing plate 12, and then make things convenient for push pedal 12 and the synchronous rotation of wave plate 4 shell, through taking picture peg 13 out, make go-between 10 and the separation of push pedal 12, and then make things convenient for the independent rotation of wave plate 4, through inserting picture peg 13 between go-between 10 and push pedal 12, make push pedal 12 promote go-between 10 entering two tracks 52, promote behind track 52 position at wave plate 4, the relative track 52 of wave plate 4 shell can not rotate, picture peg 13 is taken out this moment, go-between 10 and push pedal 12 separation, and then the wave plate 4 shell is in track 52 alone, thereby the rotation of push pedal 12 can not influence the motion of wave plate 4, can rotate analyzer 2 alone this moment, perhaps rotate wave plate 4 alone, make things convenient for researcher's measurement.

One side of the inserting plate 13 is provided with a connecting rope 14, the connecting rope 14 connects the inserting plate 13 to the pushing plate 12, so that the inserting plate 13 is not separated from the pushing plate 12 after being pulled out of the slot 11, two ends of the connecting rope 14 are respectively fixedly connected with the inserting plate 13 and the pushing plate 12, and after the inserting plate 13 is pulled out, the inserting plate 13 is prevented from being lost, and the inserting plate 13 is convenient to reuse.

The side of the track 52, which is located at the inserting plate 13, is provided with an ejection mechanism 8, the ejection mechanism 8 can eject the inserting plate 13 out of the slot 11, so that the inserting plate 13 can be conveniently separated from the slot 11, the ejection mechanism 8 comprises a displacement plate 81 which is arranged between the two tracks 52 and can be pushed by a connecting ring 10, the displacement plate 81 is in sliding connection with the track 52, one side of the inserting plate 13 is provided with an ejector pin 82 which can be inserted into the inserting plate 13 to eject the inserting plate 13, the ejector pin 82 is in sliding connection with the base of the track 52, the ejector pin 82 is connected with one side of the track 52 through a spring 83, two ends of the spring 83 are respectively fixedly connected with the ejector pin 82 and the base, the outer side of the ejector pin 82 is provided with an ejector block 84, the displacement plate 81 is fixedly connected with a connecting plate 85, the connecting plate 85 is fixedly connected with the ejector block 84, the ejector block 84 is connected with one side of the displacement plate 81 through a connecting plate 85, one side of the ejector block 84 is provided with an inclined surface, the ejector block 84 is pushed through the displacement plate 81, the ejector pin 82 is inserted into the insert plate 13 by the ejector block 84, the insert plate 13 is separated from the slot 11, after the wave plate 4 shell is pushed into the track 52, the connecting ring 10 of the wave plate 4 shell pushes the displacement plate 81 to move, the displacement plate 81 drives the connecting plate 85 to move while moving, the connecting plate 85 drives the inclined surface of the ejector block 84 to pass through the end part of the ejector pin 82, the ejector pin 82 is pressed into the slot 11, at the moment, the insert plate 13 is pushed out by the ejector pin 82, the displacement plate 81 continues to move, the inclined surface of the displacement plate 81 is separated from the ejector pin 82, the spring 83 of the ejector pin 82 rebounds, the ejector pin 82 is pulled out from the slot 11, at the moment, the push plate 12 is separated from the connecting ring 10, the rotation of the rotating shaft 72 does not affect the position of the wave plate 4 shell, the wave plate 4 shell is positioned in the track 52, the wave plate 4 shell can be rotated to a position convenient to measure by rotating the analyzer 2 shell, and the wave plate 4 shell can be separated from the push plate 12 by continuing to rotate, and furthermore, the manual separation of researchers is not needed, and the operation of the researchers is facilitated.

Example two

One side of the shell of the analyzer 2 is provided with a pushing column 15 which can be abutted against the outer side of the shell of the wave plate 4, the pushing column 15 is fixedly connected with the shell of the analyzer 2, the pushing column 15 is connected with the shell of the wave plate 4 in a sliding manner, one side of the shell of the wave plate 4 is provided with an auxiliary part 9 which can be pushed by the pushing column 15 and can rotate along with the analyzer 2, the auxiliary part 9 can assist the shell of the wave plate 4 and the pushing column 15 to synchronously rotate, the auxiliary part 9 comprises a connecting shaft 91 arranged in the shell of the wave plate 4, the connecting shaft 91 is fixedly connected with the shell of the wave plate 4, the outer side of the connecting shaft 91 is provided with a pushing plate 92, the pushing plate 92 is rotationally connected with the connecting shaft 91, the pushing plate 92 is arranged in a V shape, after the pushing column 15 is rotated to the position of the pushing plate 92, the pushing plate 92 rotates and tilts the other side of the pushing plate 92, so that the pushing column 15 can synchronously push the wave plate 4 to rotate after pushing the next circle, after the light is independently tested by using the analyzer 2, then, the light passes through the wave plate 4 and then rotates the analyzer 2, the light is further measured, finally, the analyzer 2 is pushed to rotate, the analyzer 2 pushes the pushing column 15 to pass through the pushing plate 92, one side of the pushing plate 92 is pressed downwards, the other side of the pushing plate 92 is tilted, at the moment, the pushing column 15 rotates by a certain angle, after the pushing column 15 rotates to the position of the pushing plate 92 again, the number of rotation turns of the analyzer 2 is greater than one turn and less than two turns, after the pushing column 15 reaches the tilted position of the pushing plate 92, the pushing column 15 directly pushes the tilted pushing plate 92 to move, the pushing wave plate 4 is pushed to rotate synchronously, the analyzer 2 and the wave plate 4 are rotated synchronously through the pushing column 15 and the auxiliary piece 9 to measure the light at one side, then a researcher can measure the light for multiple times only by rotating the analyzer 2, and then the researcher can operate independently.

The pushing plate 92 comprises a pushing part 921 and a rotating part 922 located at one side of the pushing part 921, magnets 93 mounted inside the wave plate 4 casing are arranged at one side of the pushing part 921 and one side of the rotating part 922, the two magnets 93 are fixedly connected with the wave plate 4 casing, the pushing plate 92 is a steel plate, the pushing column 15 pushes the rotating part 922 to rotate, so that the pushing part 921 is separated from the magnet 93, the rotating part 922 is attached to the magnet 93, the next circle of the pushing column 15 can push the wave plate 4 to rotate, when the pushing column 15 contacts the rotating part 922 for the first time, the rotating part 922 rotates, the rotating part 922 is adsorbed on one of the magnets 93, the pushing part 921 is separated from the other one of the magnets 93, the pushing part 921 tilts up, and then, when the pushing column 15 passes through the pushing part 921, the pushing column 15 can push the pushing part 921 to move, the two magnets 93 are used for facilitating the stability of the pushing plate 92 after rotation, and the pushing plate 92 is pushed conveniently.

Track 52's inside is equipped with the rubber block 16 that can be pushed back butt in wave plate 4 shell side by wave plate 4 shell, and rubber block 16 is circular-arcly, and when wave plate 4 shell passed through rubber block 16 position, rubber block 16 was flattened, behind the rubber block 16 was crossed to the plectrum shell, rubber block 16 was ejecting, and wave plate 4 position is comparatively stable be located track 52, and then make things convenient for the stable rotation of wave plate 4 shell.

One side of the displacement plate 81 is provided with a guide post 17, the guide post 17 can be inserted into the rail 52, and the guide post 17 facilitates the sliding of the displacement plate 81 relative to the rail 52, so that the displacement plate 81 can slide more stably.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.