A card slot type sample plate tray for the sample pool of the NWR laser ablation device

Abstract

The present invention relates to the field of laser ablation technology, and discloses a slot-type sample plate tray for a sample pool of an NWR laser ablation device, comprising: a metal base, arranged on the top of a metal substrate, with sliding bars arranged on both sides of the bottom of the metal substrate; a standard sample placement slot, provided on the metal base, for placing a standard sample; a limit slot for a sample to be tested, provided on the metal base, located on both sides of the standard sample placement slot, with a side wall provided with a layout plate entry and exit hole, for placing a square sample to be tested; a push-pull layout plate, installed in the limit slot for the sample to be tested through the layout plate entry and exit hole, with a layout plate bent handle arranged on the side; and a placement slot for the sample to be tested, provided on the push-pull layout plate. The slot-type sample plate tray has a simple structure, is easy to operate, and has a low cost. It can reduce the pre-preparation time of the experimenter and significantly improve the efficiency of the experiment. The sample to be tested and the standard sample are located on the same plane, which is conducive to improving the accuracy of the experiment.

Description

Technical Field

[0001] The present invention relates to the technical field of laser ablation, and in particular to a card slot type sample plate tray for a sample pool of an NWR laser ablation device. Background Art

[0002] As laser ablation systems mature, laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS), a direct solid sampling and microanalysis technique, has gained widespread application in fields such as geology, the environment, biology, materials, and industrial product testing. It can analyze major, trace, and ultratrace elements, particularly rare earth elements, PGEs, and isotope analysis. LA-ICP-MS uses laser beam energy to ablate solid samples into aerosols, which are then transported via carrier gas into an inductively coupled plasma mass spectrometer for elemental analysis.

[0003] Before performing laser ablation of samples, the laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) method must be stabilized by adjusting operating parameters (beam spot diameter, energy density, and matrix position). This process is time-consuming and consumes large amounts of gases such as argon and helium. The replacement of each set of samples significantly reduces experimental efficiency. Therefore, a slot-type sample plate tray for the sample cell of the NWR laser ablation device is urgently needed to improve the convenience of sample replacement and experimental efficiency. Summary of the Invention

[0004] The purpose of the present invention is to provide a card slot type sample plate tray for a sample pool of an NWR laser ablation device, so as to solve the problem of low efficiency in replacing samples to be tested.

[0005] The present invention provides a card slot type sample plate tray for a sample pool of an NWR laser ablation device, comprising:

[0006] A metal base, which is arranged on the top of the metal base, and sliding bars are arranged on both sides of the bottom of the metal base;

[0007] There are several standard sample placement slots, each of which is provided on the metal base and is used to place standard samples;

[0008] The limit grooves for the sample to be tested are arranged on the metal base. The limit grooves for the sample to be tested are located on both sides of the standard sample placement groove. The side walls of the limit grooves for the sample to be tested are provided with entry and exit holes for the sample placement plate. The limit grooves for the sample to be tested are used to place square samples to be tested.

[0009] A push-pull sample plate, the push-pull sample plate is installed in the limit groove of the sample to be tested through the sample plate entry and exit hole, and a sample plate bent handle is provided on the side of the push-pull sample plate;

[0010] The sample placement groove to be tested is arranged on the push-pull type sample placement plate.

[0011] Preferably, the depth of the standard sample placement groove is greater than the thickness of the standard sample.

[0012] Preferably, the depth of the groove for placing the sample to be tested is less than the thickness of the square sample to be tested.

[0013] Preferably, the depth of the limiting groove of the sample to be tested, the depth of the inlet and outlet hole of the lofting plate and the thickness of the push-pull lofting plate decrease in sequence.

[0014] Preferably, the standard sample placement groove is a circular groove, and there are four standard sample placement grooves, and the diameters of the standard sample placement grooves are 25 mm, 25 mm, 16 mm, and 9 mm respectively.

[0015] Preferably, the standard sample placement groove is used to place circular samples to be tested.

[0016] Preferably, the sample placement groove to be tested is a square groove, and the size of the sample limiting groove to be tested is 52 mm×27 mm×1.5 mm.

[0017] Preferably, the sizes of the sliding bars are 6mm×119mm×5mm and 6mm×126mm×5mm respectively.

[0018] Preferably, the card slot type sample plate tray comprises four standard sample placement slots and four test sample placement slots, and the card slot type sample plate tray is used to place four standard samples and four square test samples.

[0019] Preferably, springs are provided on both sides of the standard sample placement groove, and the springs are used to fix the standard sample or the circular sample to be tested; double-sided tape is provided in the sample placement groove, and the double-sided tape is used to stick and fix the square sample to be tested.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The card slot type sample plate tray of the present invention has a simple structure, easy operation, low cost, can reduce the preliminary preparation time of the experimenter, and significantly improve the experimental efficiency. The sample to be tested and the standard sample are located on the same plane, which is conducive to improving the accuracy of the experiment.

[0022] 2. The sample to be tested is pushed into the sample limit slot by the push-pull sample plate, which can realize the rapid replacement of samples. There is no need to re-calibrate the sample plate tray later, which effectively shortens the sample fixing time during the sample replacement process and improves the sample replacement efficiency.

[0023] 3. By placing the sample to be tested in the sample placement slot, the sample to be tested can be calibrated for the first time, and the sample to be tested and the standard sample can be placed on the same plane, thereby improving the accuracy of the experimental data. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without any creative work.

[0025] Figure 1 This is a schematic structural diagram of a card slot type sample plate tray for a sample cell of an NWR laser ablation device according to the present invention;

[0026] Figure 2 It is a top view of a card slot type sample plate tray for a sample cell of an NWR laser ablation device according to the present invention;

[0027] Figure 3 This is a left view of a card slot type sample plate tray for a sample cell of an NWR laser ablation device according to the present invention;

[0028] Figure 4 This is a schematic structural diagram of a push-pull type lofting plate according to an embodiment of the present invention;

[0029] Figure 5 It is a top view of the push-pull type lofting plate in an embodiment of the present invention.

[0030] Among them, 1. Metal base; 2. Metal base; 3. Standard sample placement slot; 4. Limiting slot for the sample to be tested; 5. Push-pull type layout plate; 6. Layout slot for the sample to be tested; 7. Layout plate entry and exit hole; 8. Layout plate bent handle; 9. Sliding bar. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0032] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0033] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0034] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0035] As laser ablation systems mature, laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS), a direct solid sampling and microanalysis technique, has gained widespread application in fields such as geology, the environment, biology, materials, and industrial product testing. It can analyze major, trace, and ultratrace elements, particularly rare earth elements, PGEs, and isotope analysis. LA-ICP-MS uses laser beam energy to ablate solid samples into aerosols, which are then transported via carrier gas into an inductively coupled plasma mass spectrometer for elemental analysis.

[0036] Before performing laser ablation of samples, it is necessary to adjust the operating parameters (beam spot diameter, energy density, matrix tube position, etc.) to achieve a stable state of laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). This process is time-consuming and consumes large amounts of gases such as argon and helium. The replacement of each set of samples to be tested greatly reduces experimental efficiency.

[0037] To solve the above problems, Figure 1-Figure 5 As shown, the present invention provides a card slot type sample plate tray for a sample pool of an NWR laser ablation device, comprising:

[0038] The metal base 2 is arranged on the top of the metal base 1, and sliding bars 9 are arranged on both sides of the bottom of the metal base 1;

[0039] There are several standard sample placement slots 3, which are opened on the metal base 2 and are used to place standard samples;

[0040] The sample limiting groove 4 is provided on the metal base 2. The sample limiting groove 4 is located on both sides of the standard sample placement groove 3. The side walls of the sample limiting groove 4 are provided with a sample plate entry and exit hole 7. The sample limiting groove 4 is used to place a square sample to be tested.

[0041] A push-pull sample plate 5 is installed in the sample limit groove 4 through the sample plate access hole 7. A sample plate bent handle 8 is provided on the side of the push-pull sample plate 5.

[0042] The sample placement slot 6 is provided on the push-pull type sample placement plate 5 .

[0043] The present invention can ensure the precise positioning of the standard sample and the sample to be tested on the metal base 2 by designing the standard sample placement slot 3 and the sample limit slot 4 to be tested, thereby avoiding positional deviation of the sample during the test process and improving the accuracy of the test results. The push-pull layout plate 5 design allows users to conveniently place and remove the sample to be tested, and can quickly replace the sample without complicated operations, thereby improving the experimental efficiency. Layout plate inlet and outlet holes 7 are set on both sides of the sample limit slot 4 to be tested, and are equipped with push-pull layout plates 5, so that the card slot type sample plate tray can be applied to samples to be tested of different sizes and shapes, enhancing its versatility and flexibility. The design of the metal base 2 and the metal matrix 1 makes the entire tray structure stable and able to withstand various forces and vibrations during the test process, ensuring the stability and safety of the sample. The design of the card slot type sample plate tray makes the connection between the various components simple and clear, easy to disassemble and clean, and ensures the cleanliness and hygiene of the experimental environment.

[0044] It can be understood that the setting of the limit groove 4 of the sample to be tested enables the push-pull type sample placement plate 5 to reach the same position each time, thereby avoiding repeated calibration of the sample plate tray and improving the experimental efficiency.

[0045] The technical solution of the present invention shows significant beneficial effects in improving sample placement accuracy, enhancing operational convenience, adapting to different sample requirements, having a stable and reliable structure, and being easy to maintain and clean.

[0046] In some embodiments of the present application, the depth of the standard sample placement groove 3 is greater than the thickness of the standard sample.

[0047] In this embodiment, because the depth of the standard sample placement slot 3 is greater than the thickness of the standard sample, this ensures that the standard sample does not make unnecessary contact or friction with the slot bottom due to insufficient depth during placement, thereby avoiding measurement errors that may be caused and improving experimental accuracy. This design allows the use of standard samples of varying thicknesses without the need for a separate placement slot for each sample thickness, greatly enhancing the versatility and flexibility of the device and reducing its cost. The appropriate depth design effectively prevents unnecessary damage to the standard sample during placement or removal, extending its service life and reducing the frequency and cost of replacement.

[0048] In some embodiments of the present application, the depth of the test sample placement groove 6 is less than the thickness of the square test sample.

[0049] In some embodiments of the present application, the depth of the limiting groove 4 of the sample to be tested, the depth of the entry and exit hole 7 of the lofting plate, and the thickness of the push-pull lofting plate 5 decrease in sequence.

[0050] It is understandable that the push-pull sample plate 5 passes through the sample plate access holes 7 on both sides of the metal base 1 and is pushed and pulled to the square sample limit groove 4 of the metal base 2. The push-pull sample plate can realize the rapid replacement of samples and improve the experimental efficiency.

[0051] In this embodiment, in order to ensure that the push-pull type lofting plate 5 is placed into the sample limiting groove 4 to be tested through the lofting plate inlet and outlet holes 7, the depth of the sample limiting groove 4 to be tested, the depth of the lofting plate inlet and outlet holes 7 and the thickness of the push-pull type lofting plate 5 need to be set to decrease in sequence. The present invention makes the installation and disassembly of the lofting plate more convenient through the push-pull type design, improves the flexibility of operation, and facilitates the user to quickly replace or adjust the lofting plate according to actual needs. The design of the sample limiting groove 4 to be tested, the lofting plate inlet and outlet holes 7 and the thickness of the push-pull type lofting plate 5 ensures the precise positioning of the lofting plate during the installation process, and effectively prevents measurement errors caused by position deviation. This design makes the entire device structure more compact, not only saves space, but also enhances the overall stability, which is conducive to achieving efficient and accurate testing work in a limited space. The push-pull type design simplifies the operating process, reduces unnecessary steps and time consumption, and thus improves the overall testing efficiency.

[0052] In some embodiments of the present application, the standard sample placement slot 3 is a circular slot. Four standard sample placement slots 3 are provided, and the diameters of the standard sample placement slots 3 are 25 mm, 25 mm, 16 mm, and 9 mm, respectively. Multiple standard sample placement slots 3 of different diameters can accommodate samples of varying diameter gradients, thereby improving the utilization rate of the sample plate tray.

[0053] In this embodiment, by designing a plurality of standard sample placement slots 3 of different diameters, it is possible to accommodate samples of various diameter gradients, avoiding the limitations of a single-size sample placement slot on sample diversity and tray space, thereby improving the overall utilization rate of the tray. The diverse design of standard sample placement slots 3 enables experimenters to flexibly select and use appropriate sample sizes according to different experimental requirements, thereby improving the flexibility and adaptability of the experimental design. There is no need to frequently replace sample plate trays of different sizes, which reduces the operating steps and time costs during the experiment and improves the experimental efficiency. The unified design of standard sample placement slots 3 is conducive to the standardized management and storage of experimental samples, and facilitates the recording and comparative analysis of experimental results.

[0054] In some embodiments of the present application, the standard sample placement slot 3 is used to place a circular sample to be tested.

[0055] In this embodiment, the samples to be tested include circular samples to be tested and square samples to be tested. The square samples to be tested are placed in the sample placement slot 6 , while the circular samples to be tested can be placed in the standard sample placement slot 3 .

[0056] It is understandable that by designing the standard sample placement slot 3, which is specifically used to place circular samples to be tested, samples of different shapes can be placed in a targeted manner, avoiding the inconvenience of placement or measurement errors caused by differences in sample shapes. The standard sample placement slot 3 is optimized for circular samples to be tested, which can ensure that the sample remains stable during the measurement process, reduce measurement errors caused by sample movement or tilt, and thus improve measurement accuracy. In the same device, by distinguishing between the standard sample placement slot 3 and the sample placement slot 6, the classified placement of circular and square samples to be tested is achieved, the space utilization of the equipment is optimized, and the entire measurement process is more orderly and efficient. By adding the standard sample placement slot 3, this technical solution enables the equipment to be applicable to more types of samples to be tested, enhances the applicability and flexibility of the equipment, and meets the needs of different users and scenarios.

[0057] In some embodiments of the present application, the sample placement groove 6 is a square groove, and the size of the sample limiting groove 4 is 52 mm×27 mm×1.5 mm.

[0058] In this embodiment, the sample placement slot 6 to be tested is designed as a square slot, and its dimensions are accurate to 52mm×27mm×1.5mm, which can ensure that the sample to be tested can fit tightly when placed, avoiding movement or shaking of the sample during the test, thereby improving the accuracy and stability of the test. Through the sophisticated design of the sample placement slot, the sample placement steps can be simplified, and the adjustment time caused by sample size mismatch can be reduced, thereby improving the overall efficiency of the test. Since the sample can remain stable during the test, the influence of external factors on the test results is reduced, and it can more accurately reflect the performance of the sample to be tested, thereby enhancing the reliability of the test results. The design of the square slot makes sample placement more intuitive and convenient, and is also conducive to the cleaning and maintenance of the equipment, reducing the difficulty and cost of operation.

[0059] In some embodiments of the present application, sliding bars 9 are provided on both sides of the bottom of the metal base 1 , and the sizes of the sliding bars 9 are 6 mm×119 mm×5 mm and 6 mm×126 mm×5 mm, respectively.

[0060] In this embodiment, two groups of sliding bars 9 are designed on both sides of the bottom of the metal base 1. These two groups of sliding bars 9 are not only symmetrical in position, but also each has specific size specifications, and their specifications are designed according to the ground shape of the metal base 1. Among them, the sliding bar 9 on one side has a size precisely set to 6mm (width) × 119mm (length) × 5mm (height), ensuring stability and durability during installation and sliding. The sliding bar 9 on the other side is slightly longer, and its size is designed to be 6mm (width) × 126mm (length) × 5mm (height). Such a design may be to adapt to specific usage scenarios or needs, such as increasing the sliding stroke or providing additional support area. Both groups of sliding bars 9 provide important support for the overall structure and function realization of the metal base 1 with their precise size and reasonable layout.

[0061] It can be seen that by arranging the sliding bar 9 at the bottom of the metal base 1, the contact area between the base and other components or surfaces is effectively increased, thereby improving the stability of the overall structure. This design is particularly suitable for application scenarios that need to withstand greater pressure or vibration, such as precision machinery, automation equipment and other fields. The design of the sliding bar 9 enables the metal base 1 to slide easily on a preset track or plane, making it convenient for users to fine-tune and position the position according to actual needs. This feature is particularly practical in situations where frequent adjustments to position or angle are required, such as laboratory equipment, photographic equipment stands, etc. The sliding bar 9 is usually made of wear-resistant and corrosion-resistant materials, which can effectively resist wear and corrosion in daily use. This design extends the service life of the metal base 1 and the components it supports, and reduces maintenance and replacement costs.

[0062] In some embodiments of the present application, the card slot type sample plate tray includes four standard sample placement slots 3 and four test sample placement slots 6 , and the card slot type sample plate tray is used to place four standard samples and four square test samples.

[0063] In this embodiment, the card slot type sample plate tray is divided into two main areas: a standard sample placement area and a test sample placement area. Each area is provided with four card slots to ensure that the samples are securely placed. In the standard sample placement area, four standard sample placement slots 3 are evenly spaced at predetermined intervals. These standard samples serve as a reference or benchmark for subsequent comparative analysis to ensure the accuracy and reliability of the test results. The test sample placement area is provided with four square test sample placement slots 6. These square test samples are the main objects of experiment or detection. By placing them in the card slots, various test operations such as sampling, analysis, and comparison can be conveniently performed.

[0064] The entire slotted sample plate tray is made of high-quality materials, with a smooth surface for easy cleaning and maintenance. Its compact design not only saves space but also improves work efficiency. Furthermore, the tray offers excellent corrosion and wear resistance, adapting to various complex working environments, ensuring sample safety and smooth testing.

[0065] In some embodiments of the present application, springs are provided on both sides of the standard sample placement groove 3, which are used to fix the standard sample or the circular sample to be tested; double-sided tape is provided in the sample placement groove 6, which is used to stick and fix the square sample to be tested.

[0066] In this embodiment, spring devices are designed on both sides of the standard sample placement slot 3. Their main function is to ensure that both the standard sample and the circular sample to be tested can be firmly fixed in the placement slot to avoid displacement or falling off during the test or analysis process, thereby ensuring the accuracy and reliability of the test results. As for the square sample to be tested, a double-sided tape is used to fix it. High-quality double-sided tape is pre-pasted on the bottom wall of the sample placement slot 6. Its viscosity is strong and long-lasting, and it can easily stick the square sample to be tested firmly in the slot. This design not only simplifies the sample fixing step and improves work efficiency, but also ensures the stability of the square sample during the test process, further improving the accuracy of the test.

[0067] It is understandable that by providing springs on both sides of the standard sample placement slot 3, standard samples or circular test samples of different sizes and shapes can be flexibly fixed without replacing fixtures or adjusting equipment, thereby improving test efficiency and convenience. Double-sided tape is provided in the test sample placement slot 6 to firmly adhere and fix the square test sample, thereby preventing the sample from shifting or falling off during the test and ensuring the accuracy and reliability of the test results. This technical solution achieves stable fixation of samples of different shapes through a simple mechanical structure and material selection, without the need for complex operating steps or additional fixing tools, thus reducing operational difficulty and cost.

[0068] As can be seen, the circular standard sample placement slot 3 extends through the metal base 1 and is secured by a spring; the square test sample retaining slot 4 extends through the metal base 1 and is secured by the test sample placement slot 6 of the push-pull layout plate 5 and a small amount of double-sided tape. This method of securing the standard sample and the test sample ensures that they are located on the same plane, improving the accuracy of the experimental data.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the same. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solutions of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A card slot type sample plate tray for a sample cell of an NWR laser ablation device, characterized in that: include: A metal base, which is arranged on the top of the metal base, and sliding bars are arranged on both sides of the bottom of the metal base; There are several standard sample placement slots, each of which is provided on the metal base and is used to place standard samples; The limit grooves for the sample to be tested are arranged on the metal base. The limit grooves for the sample to be tested are located on both sides of the standard sample placement groove. The side walls of the limit grooves for the sample to be tested are provided with entry and exit holes for the sample placement plate. The limit grooves for the sample to be tested are used to place square samples to be tested. A push-pull sample plate, the push-pull sample plate is installed in the limit groove of the sample to be tested through the sample plate entry and exit hole, and a sample plate bent handle is provided on the side of the push-pull sample plate; The sample placement groove to be tested is arranged on the push-pull type sample placement plate.

2. The card slot type sample plate tray for the sample pool of the NWR laser ablation device according to claim 1, characterized in that: The depth of the standard sample placement groove is greater than the thickness of the standard sample.

3. The card slot type sample plate tray for the sample pool of the NWR laser ablation device according to claim 1, characterized in that: The depth of the groove for placing the sample to be tested is less than the thickness of the square sample to be tested.

4. The card slot type sample plate tray for the sample pool of the NWR laser ablation device according to claim 1, characterized in that: The depth of the limit groove of the sample to be tested, the depth of the entry and exit hole of the lofting plate and the thickness of the push-pull lofting plate decrease in sequence.

5. The card slot type sample plate tray for the sample pool of the NWR laser ablation device according to claim 1, characterized in that: The standard sample placement groove is a circular groove, and there are four standard sample placement grooves. The diameters of the standard sample placement grooves are 25 mm, 25 mm, 16 mm, and 9 mm respectively.

6. The card slot type sample plate tray for the sample pool of the NWR laser ablation device according to claim 5, characterized in that: The standard sample placement groove is used to place the circular sample to be tested.

7. The card slot type sample plate tray for the sample pool of the NWR laser ablation device according to claim 1, characterized in that: The sample placement groove to be tested is a square groove, and the size of the sample limiting groove to be tested is 52mm×27mm×1.5mm.

8. The card slot type sample plate tray for the sample pool of the NWR laser ablation device according to claim 1, characterized in that: The dimensions of the sliding bars are 6 mm×119 mm×5 mm and 6 mm×126 mm×5 mm respectively.

9. The card slot type sample plate tray for the sample pool of the NWR laser ablation device according to claim 1, characterized in that: The card slot type sample plate tray comprises four standard sample placement slots and four to-be-tested sample placement slots, and is used to place four standard samples and four square to-be-tested samples.

10. The card slot type sample plate tray for the sample pool of the NWR laser ablation device according to claim 1, characterized in that: Springs are provided on both sides of the standard sample placement slot, and the springs are used to fix the standard sample or the circular sample to be tested; The sample placement groove is provided with a double-sided tape, and the double-sided tape is used to stick and fix the square sample to be tested.

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