Graduated cylinder reading platform

Abstract

This invention relates to the field of experimental equipment technology, and particularly to a platform for reading graduated cylinders. The graduated cylinder reading platform employs a split-type assembly structure, with an electronic vernier caliper and a screen vertically fixed at opposite ends of a base plate. A laser emitter is fixed to the measuring jaws of the electronic vernier caliper, and the graduated cylinder is placed between the laser emitter and the screen. The laser emitter emits a linear laser beam that passes through the graduated cylinder, forming a clear image on the screen. Utilizing the fact that the laser undergoes two refractions when passing through a concave meniscus, a broken light segment appears on the screen, while a continuous line segment appears precisely when it passes through the lowest point of the concave meniscus. By moving the laser emitter up and down or adding liquid, the point on the screen where the light segment transitions from broken to complete can be used to determine the lowest point of the concave meniscus. This reading platform provides a more objective determination of the lowest point of the concave meniscus. The precise measurement of the liquid column by the electronic vernier caliper improves the accuracy of graduated cylinder readings, simplifies the reading operation, and enables precise measurement across the entire measuring range. This invention is applicable to fields requiring precise liquid measurement, such as teaching, testing, pharmaceuticals, and chemicals.

Description

Technical Field

[0001] This invention relates to the field of experimental equipment technology, and specifically to a platform for optimizing graduated cylinder readings. Background Technology

[0002] Graduated cylinders are the most commonly used tools for measuring liquid volume in chemical laboratories and industrial production. However, their measurement accuracy has the following technical limitations: I. Limitations of Measurement Range The current GB / T 12804-2011 standard stipulates that the smallest graduation value for a 5ml graduated cylinder is 0.1ml, for a 10ml cylinder it is 0.2ml, and for a 100ml cylinder it is 1ml. This grading system makes it impossible to accurately measure non-standard volume values ​​such as 9.7ml and 98.5ml.

[0003] II. Reading Error Problem 1. The determination of the lowest point of the concave meniscus is significantly affected by the difference in elevation and depression of the viewing angle.

[0004] 2. Differences between observers lead to inconsistent readings.

[0005] 3. The error range is positively correlated with the diameter of the graduated cylinder.

[0006] III. The contradiction between sensitivity and resolution 1. In a large-diameter graduated cylinder, the sensitivity to changes in liquid level decreases.

[0007] 2. Increasing the density of scale lines can improve resolution, but it can make visual identification difficult.

[0008] 3. Reducing the diameter of the graduated cylinder while increasing its length reduces the graduation density, but an excessively long graduated cylinder weakens its stability and makes operation more difficult.

[0009] IV. Operational Bottlenecks in Precise Measurement When measuring a certain volume of liquid to make up to volume, repeated operations are required: while adding liquid drop by drop, the line of sight must be kept horizontal, which makes the process of judging the concave meniscus both difficult and prone to operational errors.

[0010] To address the shortcomings of existing technologies, two main improvement schemes exist: The first involves adding a small neck structure to the standard graduated cylinder to improve measurement accuracy through precise volume control. However, this scheme has significant limitations: it requires custom-made graduated cylinders, and to meet different volume measurement requirements, a multi-specification graduated cylinder set is necessary. This not only increases the instrument's cost and makes it incompatible with traditional graduated cylinders, but also increases the difficulty of selecting the right cylinder. The second scheme uses image recognition technology, capturing images of the liquid column in the graduated cylinder and using AI algorithms for volume recognition. While this achieves intelligent measurement, it requires extensive training and involves expensive equipment. Therefore, there is a need to develop a new reading platform that can be organically integrated with traditional graduated cylinders, offering simple operation, objective measurement, and high accuracy to drive the upgrading and development of the accuracy of traditional graduated cylinders. Summary of the Invention

[0011] This invention aims to overcome the shortcomings of traditional graduated cylinder readings, providing operators with a simple, objective, and accurate reading platform to achieve precise measurement across the entire measuring range. To achieve the above objective, the technical solution adopted by this invention is as follows: The main components of the reading platform include: an electronic vernier caliper with an accuracy of 0.01 ml, a laser emitter, a screen, and a base plate.

[0012] Parts assembly method: 1. Using a rectangular plywood board with a length of 360mm, a width of 160mm, and a thickness of 16mm as the base, cut a groove on the short side according to the bottom dimension of the electronic vernier caliper, and cut a 360mm long and 160mm wide d KT board as the light screen.

[0013] 2. Use glue to vertically fix the electronic vernier caliper in the groove, and make the 0 mark of the electronic vernier caliper and the top of the base plate at the same level; fix the screen flush with the base plate on the other short side of the base plate.

[0014] 3. Secure the laser emitter to the moving measuring jaw of the electronic vernier caliper with glue, and ensure that the laser is emitted horizontally.

[0015] Measurement principle 1. Objective and Precise Volume Measurement: When using this reading platform, the horizontally emitted linear laser beam passes perpendicularly through air and water without refraction, appearing as a straight line on the screen. When the laser beam passes through a concave meniscus, it first passes perpendicularly through glass and water, then refracts as it enters air from the inclined water surface. This refraction occurs again as the beam enters the inclined water surface. These two refractions cause the light to propagate downwards, resulting in a broken beam segment on the screen. When measuring a fixed volume, move the laser emitter to the desired volume and add liquid drop by drop. When the beam segment is just complete, the light has passed precisely through the lowest point of the concave meniscus. When measuring an unknown liquid volume, move the laser emitter up and down. The point where the line segment on the screen just returns to its complete state is the lowest point of the concave meniscus. This operation eliminates human error, making volume measurement more accurate and objective.

[0016] 2. High-precision measurement of liquid columns: The smallest division of a traditional 100ml graduated cylinder is 1ml, and the smallest graduation line spacing is 1.67mm. The accuracy of an electronic vernier caliper is 0.01mm. Theoretically, the graduation value of an electronic vernier caliper is: The use of this reading platform in conjunction with a 100ml graduated cylinder greatly improves the accuracy of graduated cylinder readings.

[0017] 3. Reduced selection of graduated cylinders, promoting improved graduated cylinder accuracy: Using a 100ml graduated cylinder with this reading platform can fully cover all volume measurements from 1ml to 100ml, reducing the range of graduated cylinder sizes. Improvements in graduated cylinder accuracy are largely limited by reading accuracy; using this platform improves graduated cylinder reading accuracy, which in turn promotes further development in graduated cylinder accuracy. Attached Figure Description Figure 1 The schematic diagram of the overall structure of the present invention shows ① electronic vernier caliper, ② light screen, ③ bubble level, ④ on, ⑤ off, ⑥ zeroing, and ⑦ laser generator. Figure 2 The diagram shows the light path of light passing above a concave meniscus (demonstrating that the light does not refract and appears as a straight line on the screen). ① Electronic vernier caliper ② Laser beam ③ Graduated cylinder ④ Screen ⑤ Bubble spirit ⑥ On ⑦ Off ⑧ Zeroing ⑨ Laser emitter

[0018] Figure 3 The diagram shows the ray of light passing through the lowest point of a concave meniscus (illuminating refraction and the broken line segment on the screen). ① Electronic vernier caliper ② Laser beam ③ Graduated cylinder ④ Screen ⑤ Bubble spirit ⑥ On ⑦ Off ⑧ Zeroing ⑨ Laser generator ⑩ Normal Figure 4 The light path diagram shows the light passing exactly through the lowest point of the concave meniscus (demonstrating that the light does not refract and appears as a straight line on the screen). ① Electronic vernier caliper ② Laser beam ③ Graduated cylinder ④ Screen ⑤ Bubble spirit ⑥ On ⑦ Off ⑧ Zeroing ⑨ Laser generator Detailed Implementation

[0019] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Example 1: Measuring 73.51ml of liquid: 1. Instrument preparation: 100ml graduated cylinder (base: 16.14mm; minimum graduation mark spacing: 1.67mm), dropper, reading platform. 2. Leveling and zeroing: Use the bubble level (⑤) to adjust the base plate to balance. Turn on (⑥), move the laser emitter (⑨) on the electronic vernier caliper to the zero mark, press the zeroing button (⑧) on the electronic vernier caliper to set the absolute zero point, move the laser emitter (⑨) to 16.14mm, and press the zeroing button (⑧) again to set the relative zero point (grading cylinder excluding the base height). 3. Calculate the length of the liquid column: And move the laser emitter ⑨ to 122.76mm. 4. Precise volume determination: Place the graduated cylinder at twice the focal length on the base plate, add liquid to the graduated cylinder, and observe that the light segment on the screen just changes from broken to complete. At this time, the liquid volume is 73.51ml.

[0020] Example 2: Measuring the Volume of an Unknown Liquid: 1. Instrument Preparation: 100ml graduated cylinder (base: 16.14mm; minimum graduation line spacing: 1.67mm), dropper, reading platform. 2. Leveling and Zeroing: Use the bubble level (⑤) to balance the base plate. Turn on (⑥) and move the laser emitter (⑨) on the electronic vernier caliper to the zero mark. Press the zeroing button (⑧) on the electronic vernier caliper to set the absolute zero point. Move the laser emitter (⑨) to 16.14mm and press the zeroing button (⑧) again to set the relative zero point (excluding the height of the graduated cylinder base). 3. Positioning and Reading: Place the graduated cylinder containing the liquid on the base plate at twice the focal length and move the laser emitter (⑨) up and down. When the line segment on the screen just changes from broken to complete, read the electronic vernier caliper reading n. 4. Conversion and Confirmation: Use... The calculated answer is the volume that was measured.

Claims

1. A graduated cylinder reading platform, comprising an electronic vernier caliper, a laser emitter, a level, a screen, and a base plate. Its characteristics are: The length of the liquid column in a graduated cylinder is accurately measured using an electronic vernier caliper. When a laser passes perpendicularly through the concave meniscus of a graduated cylinder, it undergoes two refractions, appearing as a broken light segment on the screen. When the laser passes through a homogeneous liquid and air, no refraction occurs, and it appears as a complete light segment on the screen. By adding liquid drop by drop or moving the laser emitter up and down, the phenomenon of the light segment on the screen changing from broken to complete can be used to determine the lowest point of the concave meniscus.

2. Fix the electronic vernier caliper and the screen vertically to both ends of the base plate. Fix the laser emitter to the measuring jaws of the vernier caliper and move it up and down with the jaws. The zero mark of the electronic vernier caliper is at the same level as the base plate. Place the measuring cylinder between the laser emitter and the screen. The horizontally emitted linear laser beam passes vertically through the measuring cylinder and forms a clear image on the screen.

Images