Reagent card position detection device
Through the image feature detection method of the reagent card position detection device, the problem of low accuracy, high cost and high false alarm rate in the prior art is solved, and high detection of high accuracy, low cost and low false alarm rate is realized. Effect.
Patent Information
- Application Number
- CN202421149074.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-23
- Publication Date
- 2025-02-07
- Estimated Expiration
- 2034-05-23
AI Technical Summary
The prior art has problems such as low accuracy, high cost, high false alarm rate and easy equipment damage in the position detection of reagent card, which is difficult to meet the needs of high accuracy, low cost and low false alarm rate.
The reagent card position detection device is adopted, which includes a reagent card holder, a booth and a controller. The target area image is obtained through the booth. The controller detects the reagent card position according to the image characteristics. If the actual distance is greater than the preset threshold, the reagent is determined. The card has not been inserted.
It realizes high-precision reagent card position detection, reduces false alarm rate and detection cost, is suitable for various reagent card products, and is not prone to mechanical fatigue or device loss.
Smart Images
Figure CN222439976U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of position detection, and in particular to a reagent card position detection device. Background Art
[0002] The detection of whether the reagent card of the current mainstream embedded device is properly inserted is of great significance in ensuring the normal operation of the equipment, improving operation accuracy, enhancing user experience, preventing failures and damage, and ensuring safety.
[0003] At present, in the detection level of reagent cards, traditional optical and electrical signal sensors are mostly used to sense the position, such as:
[0004] Micro switch or optical coupler sensor: When the reagent card is inserted into place, this switch or sensor will be triggered, sending a signal to the system to indicate that the reagent card has been correctly inserted. Electrical connection detection: After the reagent card is inserted, the device will detect whether the specific circuit on the reagent card is connected to determine whether the reagent card is properly inserted. Software logic judgment: If the reagent card is not inserted properly or inserted incorrectly, the device may encounter errors or malfunction when performing related operations. The system can monitor these abnormal situations and judge the insertion status of the reagent card through software logic.
[0005] The above three methods are all based on electrical signals to indirectly determine whether the reagent card is properly inserted. The micro switch is relatively cheap, but the accuracy is not high. It is prone to mechanical fatigue when used frequently, which reduces the sensitivity. The optical coupling sensor has weak recognition ability for reagent cards with high transparency. The advantage of electrical connection detection is that the electrical signal is reliable, but the electrical connection contacts are prone to wear and stability is difficult to guarantee. Software logic judgment can achieve close to zero detection cost, but the error cost is high and is not suitable for iPOCT products. Utility Model Content
[0006] The present application provides a reagent card position detection device, which is applicable to various reagent card products and can reduce the false alarm rate and detection cost while ensuring the detection accuracy.
[0007] The present application provides a reagent card position detection device, comprising:
[0008] Reagent holder, camera and controller;
[0009] The reagent card holder has a first groove, the first groove is used to carry the reagent card, the reagent card holder can reciprocate along a preset direction, the side of the reagent card that can drip the reagent is recorded as the first surface, the plane where the highest points on both sides of the first groove are located is recorded as the second surface, and the first surface and the second surface are in the same horizontal plane;
[0010] The focus of the photographing member is located on the horizontal plane where the first surface and the second surface are located. The photographing member is connected to the controller. The photographing member is used to obtain a target area image, and the target area image includes the reagent card holder and the reagent card. The controller is used to detect the position of the reagent card according to the target area image. If the actual distance between the reagent card holder and the reagent card is greater than a preset threshold, the reagent card is not properly inserted.
[0011] Optionally, the reagent cartridge seat further comprises a mechanical stop assembly, and the mechanical stop assembly is used to fix the reagent card on the reagent cartridge seat.
[0012] Optionally, the first groove includes a bottom surface, a first side surface and a second side surface, the bottom surface is connected to the first side surface and the second side surface respectively, the first side surface and the second side surface are opposite to each other, and the mechanical limit assembly is arranged on the first side surface and / or the second side surface.
[0013] Optionally, when the mechanical limit assembly is arranged on the first side and the second side, the mechanical limit assembly includes a first sub-limiting member and a second sub-limiting member, the first sub-limiting member is arranged on the first side, the second sub-limiting member is arranged on the second side, and the first sub-limiting member and the second sub-limiting member are arranged relative to each other.
[0014] Optionally, the mechanical limiting assembly includes an elastic positioning assembly.
[0015] Optionally, a base is further included, and the base is used to support and fix the reagent cartridge.
[0016] Optionally, a driving member is further included, wherein the driving member is connected to the base, and the driving member is used to drive the base to reciprocate along the preset direction.
[0017] Optionally, vertical projections of the first central axis of the driving member, the second central axis of the base, the third central axis of the reagent card holder, the fourth central axis of the reagent card and the fifth central axis of the photographing member coincide with each other.
[0018] Optionally, the shooting component includes a fill light, and the fill light is used to provide fill light for the reagent card holder and the reagent card.
[0019] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:
[0020] The reagent card position detection device provided in the embodiment of the present application realizes position detection based on image features through the cooperation of the reagent card holder, the camera and the controller. It is not easy to have mechanical fatigue or device loss, has higher accuracy and helps to reduce detection costs. In addition, the detection object is the image feature, and the actual distance between the reagent card holder and the reagent card is judged according to the image feature, so as to detect the position of the reagent card. In this way, as long as the image includes the reagent card holder and the reagent card, there is no need to limit the shape of the reagent card, so it can be applicable to various reagent card products. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present utility model, and together with the description, are used to explain the principles of the present utility model.
[0022] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.
[0023] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.
[0024] Figure 1 A schematic diagram of the structure of a reagent card position detection device provided in an embodiment of the present application;
[0025] Figure 2 A schematic diagram of the structure of a mechanical limit assembly provided in an embodiment of the present application;
[0026] Figure 3 A schematic diagram of a target area image provided in an embodiment of the present application;
[0027] Figure 4 A schematic diagram of the demarcated boundary of the target area image provided in the embodiment of the present application;
[0028] Figure 5 A flow chart of a reagent card position detection method provided in an embodiment of the present application.
[0029] Explanation of symbols:
[0030] 1-driving member, 2-shooting member, 3-reagent holder, 4-reagent card, 5-mechanical limit assembly, 6-base; 7-elastic positioning assembly, 8-protruding structure, 9-second groove, 10-reference distance, 11-position distance, 12-contour boundary. DETAILED DESCRIPTION
[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.
[0032] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention may repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.
[0033] In order to solve the problems in the prior art that the methods are not universal, cannot guarantee accuracy and are costly, the present application provides a reagent card position detection device that is suitable for various reagent card products and can reduce the false alarm rate and detection cost while ensuring detection accuracy.
[0034] Figure 1 A schematic diagram of the structure of a reagent card position detection device provided in an embodiment of the present application is shown in FIG. Figure 1 As shown, a reagent card position detection device comprises:
[0035] Reagent holder 3, camera 2 and controller;
[0036] The reagent holder 3 has a first groove, and the first groove is used to carry the reagent card 4. The reagent holder 3 can reciprocate along a preset direction. The side of the reagent card 4 that can drip the reagent is recorded as the first surface, and the plane where the highest points on both sides of the first groove are located is recorded as the second surface. The first surface and the second surface are in the same horizontal plane;
[0037] The focus of the photographing member 2 is located on the horizontal plane where the first surface and the second surface are located. The photographing member 2 is connected to the controller. The photographing member 2 is used to obtain a target area image, and the target area image includes the reagent card holder 3 and the reagent card 4. The controller is used to detect the position of the reagent card according to the target area image. If the actual distance between the reagent card holder and the reagent card is greater than a preset threshold, the reagent card 4 is not properly inserted.
[0038] It should be noted that the above-mentioned reagent card 4 includes a disc-shaped reagent card, a strip-shaped reagent card, etc., and the shapes of the corresponding first grooves can be matched. The present application does not limit the specific shape of the reagent card 4 and will not be repeated here.
[0039] In addition, the reciprocating movement of the reagent holder 3 along a preset direction is to ensure that the camera 2 can accurately obtain the target area image, because the initial position of the reagent holder 3 cannot accurately obtain the target area image, so the accurate target area image can be obtained by moving the reagent holder 3. And when the reagent holder 3 moves, the reagent card 4 will also be driven to move synchronously, that is, after the reagent card 4 is installed on the reagent holder 3, the reagent holder 3 and the reagent card 4 are relatively stationary, so that the accurate target area image can be obtained.
[0040] Furthermore, since the target area image needs to include both the reagent cartridge 3 and the reagent card 4, as Figure 3 As shown, the focus of the camera 2 is located on the horizontal plane where the first surface and the second surface are located, so that every part of the target area image is ensured to be clear. If the first surface and the second surface are not on the same plane, it is easy to cause the camera 2 to take a blurred image, thereby reducing the accuracy of subsequent detection.
[0041] Furthermore, since the position detection image needs to include both the reagent cartridge 3 and the reagent card 4, the plane where the highest points on both sides of the first groove are located is recorded as the second surface. The first surface and the second surface are in the same horizontal plane. There is only one focal length for taking an image. If the objects in the image are not in the same plane, some areas will be out of focus and therefore blurred. The present application can ensure that the entire image of the target area is clear, which is beneficial to improving the accuracy of position detection.
[0042] It should be mentioned that the shooting component 2 can be a camera, etc., to facilitate the acquisition of materials, and this application does not limit the specific model.
[0043] In addition, in this application, the controller searches for the possible positions of the reagent card and the reagent holder in the target area image through the region proposal network. The trained classifier in the region proposal network will judge the category of each area based on the extracted features, and output the recognition result, and then use the segmentation technology to accurately locate the contour boundary of the reagent card and the reagent holder. It should be noted that if the reagent card has a different shape, the region proposal network can be restarted for training, so the method of this application is more applicable to reagent cards.
[0044] For further information, please refer to Figure 4Since the lines on the image have line width, the controller in the present application uses the center line distance method to determine the distance between the reagent card 4 and the reagent cartridge seat 3 (wherein the left side of the outline boundary 12 is the edge line of the reagent cartridge seat 3, and the right side of the outline boundary 12 is the edge line of the reagent card 4), that is, the distance is determined based on the center line (or axis) of the reagent card and the edge line of the reagent cartridge seat.
[0045] It should be noted that in this application, the shortest distance between center lines is used as the distance definition, which can avoid the distance error caused by the line width.
[0046] Furthermore, in the process of distance determination, it is necessary to first determine the actual width of the reagent holder, and combine the reference distance 10 and the position distance 11, wherein the reference distance 10 is the width of the reagent holder in the image, and the position distance 11 is the distance between the reagent holder and the reagent card in the image. By applying the principle of equal proportion, the actual distance between the reagent holder 3 and the reagent card 4 can be accurately calculated. When the distance exceeds the preset threshold, it can be determined that the reagent card is not properly inserted.
[0047] In a specific embodiment, the reagent cartridge 3 further includes a mechanical stopper assembly 5, and the mechanical stopper assembly 5 is used to fix the reagent card 4 on the reagent cartridge 3. The present application can well fix the reagent card on the reagent cartridge by setting the mechanical stopper assembly 5, and prevent the relative displacement between the two during the movement of the reagent cartridge.
[0048] In a specific embodiment, the first groove includes a bottom surface, a first side surface, and a second side surface, the bottom surface is connected to the first side surface and the second side surface respectively, the first side surface and the second side surface are opposite, and the mechanical limit assembly is arranged on the first side surface and / or the second side surface. The present application fixes the reagent card by arranging a mechanical limit assembly on the side surface, which can ensure that the acquisition and clarity of the target area image are not affected under the premise of fixing the reagent card, because if it is arranged on the bottom surface, the existence of the mechanical limit assembly may cause the first surface and the second surface to be not on the same plane, which may easily cause the image of the shooting member 2 to be blurred, thereby reducing the accuracy of subsequent detection.
[0049] In a specific embodiment, when the mechanical limit assembly is arranged on the first side and the second side, the mechanical limit assembly includes a first sub-limiting member and a second sub-limiting member, the first sub-limiting member is arranged on the first side, the second sub-limiting member is arranged on the second side, and the first sub-limiting member and the second sub-limiting member are arranged relative to each other. The present application can fix the reagent card well through the above-mentioned embodiment structure, and ensure that the two sides of the reagent card are evenly stressed and will not tilt. Once the reagent card tilts, it will directly affect the detection result of the distance between the reagent card and the reagent card holder, so this setting in the present application is conducive to improving the accuracy of position detection.
[0050] The first sub-limiting member and the second sub-limiting member may be elastic positioning components, such as elastic positioning beads, that is, the mechanical limiting of the reagent card is achieved by two elastic positioning beads arranged opposite to each other.
[0051] In a specific embodiment, when the mechanical limiting component is disposed on the first side surface and / or the second side surface, the mechanical limiting of the reagent card can also be achieved by adapting a reagent card of a fixed form, for example, Figure 2 As shown, the third surface and / or the fourth surface of the reagent card 4 are provided with a second groove 9, and the third surface and the fourth surface are both surfaces intersecting with the first surface; the third surface and the fourth surface are surfaces contacting the reagent card holder 3 during the process of inserting the reagent card 4 into the reagent holder 3; the mechanical limit assembly 5 includes an elastic positioning assembly 7, and the second groove 9 is used to make the elastic positioning assembly 7 engage with the reagent card 4 to fix the reagent card 4 on the reagent holder 3. In the present application, the cooperation of the elastic positioning assembly and the second groove can make the reagent holder and the reagent card engage well.
[0052] Furthermore, a protruding structure 8 is also provided on the third surface and / or the fourth surface of the reagent card 4 . When the reagent card 4 is inserted into the reagent holder 3 , the elastic positioning component 7 first passes through the protruding structure 8 and then passes through the second groove 9 .
[0053] Specifically, in the present application, by adapting a reagent card of a fixed form, that is, setting a protruding structure 8 before the second groove 9, it is possible to ensure that the reagent holder and the reagent card are more closely connected. Once the elastic positioning component 7 enters the second groove, it is less likely to have a relative displacement in the direction of the protruding structure 8. In addition, such a structural setting, during the process of inserting the reagent card: the reagent card is pushed forward, and under the action of the protruding structure 8, there will be a sense of jamming, and the spring of the elastic positioning component 7 will be charged, and then after a little force, after crossing the protruding structure 8, the accumulated force formed will be released, forming a step difference to form a tactile feedback, and there will be a small "click" sound feedback. And the existence of the second groove 9 will make the reagent card keep its position unchanged during the internal operation process, and it has a similar existence to the buckle, so that the reagent card does not loosen; and in the process of pulling out the reagent card, only a little force is needed to make the reagent card break away from the original limit position, and then it can be pulled out.
[0054] Preferably, the elastic positioning component 7 is configured as an elastic positioning bead.
[0055] In a specific embodiment, the protruding structure 8 and the second groove 9 are arranged adjacent to each other, so as to ensure that the snap-fitting structure of the mechanical limit assembly 5 is tighter; if the protruding structure and the second groove are not adjacent to each other, for example, they are separated by a certain distance, then there is only tactile feedback during the insertion process, but the snap-fitting effect is only brought about by the second groove, while in the present application, the protruding structure and the second groove are arranged adjacent to each other, and the snap-fitting effect will be achieved through the joint action of the protruding structure and the second groove, and the effect is better.
[0056] In a specific embodiment, the device of the present application further comprises a base 6, and the base 6 is used to carry and fix the reagent cartridge 3. In the present application, the base can ensure the integrity and stability of the device.
[0057] In a specific embodiment, the device of the present application further comprises a driving member 1, wherein the driving member 1 is connected to the base 6, and the driving member 1 is used to drive the base 6 to reciprocate along the preset direction. That is, the movement of the reagent cartridge 3 in the present application is essentially achieved by the driving member 1 driving the base 6.
[0058] It should be noted that the driving member 1 may be a stepper motor, which drives the nut by rotating the screw rod. In the present application, the base is fixedly mounted on the nut, and the nut drives the base to move, thereby realizing the movement of the reagent cartridge.
[0059] In a specific embodiment, the vertical projections of the first central axis of the driving member 1, the second central axis of the base 6, the third central axis of the reagent cartridge 3, the fourth central axis of the reagent card 4 and the fifth central axis of the photographing member 2 coincide. This setting in the present application is to meet the accuracy requirements of the detection device. In order to achieve high-precision detection of the position, when the components are set, the vertical projections of the first central axis of the driving member, the second central axis of the base, the third central axis of the reagent cartridge, the fourth central axis of the reagent card and the fifth central axis of the photographing member are on a straight line. In this way, even if the position of the target area image is inaccurate, it is only necessary to move along a preset direction to find the best target area image. If multiple directions move at the same time, it cannot be completely guaranteed that the vertical projections of the first central axis of the driving member, the second central axis of the base, the third central axis of the reagent cartridge, the fourth central axis of the reagent card and the fifth central axis of the photographing member are on a straight line, and it is likely that relative displacement between the components will occur during the movement, thereby affecting the effect of the target area image and ultimately affecting the detection accuracy.
[0060] In a specific embodiment, the photographing component 2 includes a fill light, and the fill light is used to provide fill light for the reagent card holder 3 and the reagent card 4 .
[0061] It should be noted that the fill light can select 4 point source LED lamp beads, and supplemented with uniform light materials, to evenly adjust the distribution of light to avoid uneven brightness, overexposure and other phenomena that lead to loss of image elements. This application can ensure the clarity of the image by filling the reagent holder and the reagent card, which is conducive to improving the accuracy of distance detection.
[0062] According to the above embodiments, the above device of the present application can be applied to a microscopic detection system, and position detection based on image features is less prone to mechanical fatigue or device loss, has higher accuracy and helps reduce detection costs.
[0063] Based on the above device, the present application also provides a reagent card position detection method, which is applied to the above controller. It should be noted that the reagent card in the present application is a single consumable. When the test is turned on, the reagent card is inserted into the reagent card holder, and the position is limited by the mechanical limit component to ensure that the reagent card is correctly inserted. The driving part (stepping motor) drives the base together with the reagent card holder and the reagent card (the reagent card holder and the reagent card are connected together, and the reagent card holder and the base are connected together) to be sent to the bottom of the shooting part (camera) for photo analysis. The specific method is as follows Figure 5 As shown, including:
[0064] Step 501: receiving a target area image, wherein the target area image includes the reagent cartridge and the reagent card.
[0065] It should be noted that the target area image here is obtained by the camera, and the camera may take multiple images in the process of obtaining the target area image, and the target area image is an image that can fully display the reference distance and the position distance and includes a part of the reagent card, such as Figure 3 shown.
[0066] Step 502: preprocessing the target area image to obtain a preprocessed image; the preprocessing includes image enhancement and wavelet transform.
[0067] In order to facilitate subsequent analysis, the target area image needs to be preprocessed. Specifically, the image is first enhanced with Retinex contrast enhancement and wavelet transform method, and then filtered with wavelet transform method, so as to enhance the image quality and remove noise, optimize the brightness and color of the image, and make it look more natural and clear.
[0068] Retinex enhancement is to perform Gaussian blur processing on the initial target area image; after performing logarithmic operations on the blurred image and the initial image respectively, the two logarithmic image results are subtracted to obtain the enhanced image.
[0069] Wavelet transform is an image denoising method based on frequency domain analysis, which can provide characteristic information of the image in the medium and low frequency bands and remove its high-frequency features to reduce interference.
[0070] Step 503: Determine the actual width of the reagent cartridge and the reference distance and position distance in the preprocessed image; the reference distance is the width of the reagent cartridge in the preprocessed image, and the position distance is the distance between the reagent cartridge and the reagent card in the preprocessed image.
[0071] It should be noted that in this application, the controller searches for possible positions of reagent cards and reagent holders in the target area image through the region proposal network. The trained classifier in the region proposal network will judge the category of each area based on the extracted features, and output the recognition result, and then use the segmentation technology to accurately locate the reference distance and position distance in the preprocessed image. It should be noted that if the reagent card has a different form, the region proposal network can be restarted for training, so the method of this application is more applicable to reagent cards.
[0072] Furthermore, since the lines on the image have line width, the controller in this application uses the center line distance method for the outline boundary of the reagent card and the reagent holder, that is, according to the center line of the reagent card and the edge line of the reagent holder (please refer to Figure 3 Position recognition and calibration boundary image) for distance judgment.
[0073] It should be noted that in this application, the shortest distance between center lines is used as the distance definition, which can avoid the distance error caused by the line width of the lines on the image.
[0074] It should be mentioned that the actual width of the reagent cartridge is the actual width of the reagent cartridge corresponding to the reference distance in the image.
[0075] Step 504: Determine the actual distance between the reagent holder and the reagent card according to the actual width of the reagent holder, the reference distance and the position distance.
[0076] The specific formula is: actual width / reference distance = actual distance / position distance
[0077] Step 505: If the actual distance is greater than a preset threshold, it is determined that the reagent card is not properly inserted.
[0078] It should be noted that the preset threshold value can be selected according to actual conditions, and the present invention does not limit the specific value.
[0079] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
[0080] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a general hardware platform, and of course, by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the relevant technology can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.
[0081] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.
[0082] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features applied herein.
Claims
1. A reagent card position detection device, characterized in that: include: Reagent holder, camera and controller; The reagent card holder has a first groove, the first groove is used to carry the reagent card, the reagent card holder can reciprocate along a preset direction, the side of the reagent card that can drip the reagent is recorded as the first surface, the plane where the highest points on both sides of the first groove are located is recorded as the second surface, and the first surface and the second surface are in the same horizontal plane; The focus of the photographing member is located on the horizontal plane where the first surface and the second surface are located. The photographing member is connected to the controller. The photographing member is used to obtain a target area image, and the target area image includes the reagent card holder and the reagent card. The controller is used to detect the position of the reagent card according to the target area image. If the actual distance between the reagent card holder and the reagent card is greater than a preset threshold, the reagent card is not properly inserted.
2. The reagent card position detection device according to claim 1, characterized in that: The reagent cartridge seat further comprises a mechanical stop assembly, and the mechanical stop assembly is used to fix the reagent card on the reagent cartridge seat.
3. The reagent card position detection device according to claim 2, characterized in that: The first groove includes a bottom surface, a first side surface and a second side surface, the bottom surface is connected to the first side surface and the second side surface respectively, the first side surface and the second side surface are opposite to each other, and the mechanical limiting component is arranged on the first side surface and / or the second side surface.
4. The reagent card position detection device according to claim 3, characterized in that: When the mechanical limit assembly is arranged on the first side and the second side, the mechanical limit assembly includes a first sub-limiting member and a second sub-limiting member, the first sub-limiting member is arranged on the first side, the second sub-limiting member is arranged on the second side, and the first sub-limiting member and the second sub-limiting member are arranged relative to each other.
5. The reagent card position detection device according to claim 2 or 3, characterized in that: The mechanical limiting component includes an elastic positioning component.
6. The reagent card position detection device according to any one of claims 1 to 4, characterized in that: It also includes a base, which is used to carry and fix the reagent cartridge.
7. The reagent card position detection device according to claim 6, characterized in that: It also includes a driving member, which is connected to the base and is used to drive the base to reciprocate along the preset direction.
8. The reagent card position detection device according to claim 7, characterized in that: The vertical projections of the first central axis of the driving member, the second central axis of the base, the third central axis of the reagent card holder, the fourth central axis of the reagent card and the fifth central axis of the photographing member coincide with each other.
9. The reagent card position detection device according to any one of claims 1 to 4, characterized in that: The shooting component includes a fill light, and the fill light is used to provide fill light for the reagent card holder and the reagent card.