CN212624508U - Young modulus device based on cmos camera demonstration - Google Patents

Abstract

The utility model discloses a young modulus device based on cmos camera demonstration, the device are based on cmos machine vision sensing system in order to ensure experimental measurement data's accuracy, further based on equivalent conversion measurement system and support stable system, involve and utilize the method of equivalent replacement to measure the tension that changes. Because traditional young modulus apparatus is bulky, adopt the tensile steel wire of big law sign indicating number to make the experiment inconvenient, if the weight is put improper still there is great potential safety hazard, traditional device adopts the optical lever to measure length in addition, enlargies the length of survey object, and this method is directly perceived, simple and convenient, but certain measuring error is ignorable. The utility model discloses improve and the innovation on this basis, make the laboratory glassware essence simplify, utilize the little weight to measure and improved the security, do not contain the approximate in the measurement derivation expression for the measured result does not have great error. The advantages are simple, portable and high precision.

Description

Young modulus device based on cmos camera demonstration

The technical field is as follows:

the utility model relates to an accurate young modulus measures technical field, specifically relates to a young modulus device based on cmos camera demonstration.

Background art:

the young modulus is an important physical quantity describing the capability of a solid material to resist deformation, and is an important physical quantity for characterizing the properties of the material, and it is very meaningful to research and measure the young modulus of the relevant material. But also is a very important experiment in college physics experiments, often requires students to be skilled in the experiment and know the practical significance, and the traditional Young modulus tester is inconvenient in the experiment due to large volume and adoption of large legal standard tensile steel wires, and has larger potential safety hazard if weights are placed improperly. In addition, the traditional device adopts an optical lever to measure the length and amplify the length of the measured object, the method is intuitive and simple, but certain measurement error cannot be ignored, and the derivation expression of the measurement method for measuring the Young modulus value contains approximation, so that the measured result has error. Therefore, a simple, portable and high-precision measuring instrument is urgently needed.

The invention content is as follows:

for overcoming the not enough that mentions among the background art, the utility model provides a young modulus device based on cmos camera demonstration comes accurate demonstration and survey young modulus's numerical value.

For realizing the purpose of the utility model, the experimental device of adoption is as follows:

a Young modulus device based on cmos camera demonstration mainly comprises a bracket 1; 2. a stabilizing base; 3. a steel wire clamping device; 4. a light fixed ring; 5. a weight hook; 6. a weight; 7. stretching the steel wire; a cmos sensor; 9. a computer display screen; two steel wire clamping devices 3 are connected to the support 1, a light fixing ring 4 is fixed to the middle point of a tensile steel wire 7, a weight hook 5 is connected with the light fixing ring 4, a weight 6 is hung on the weight hook 5, and a cmos sensor 8 is connected with a computer display screen 9.

Preferably, the support 1 has two symmetrical structures, and the two supports are parallel to each other, the support 1 is connected with the tensile steel wire 7 and the steel wire clamping device 3 and is in a vertical state, and the support 1 is connected with and fixed on the stabilizing base 2.

Preferably, the light-weight fixing ring 4 is fixed at the midpoint of the tensile steel wire 7.

Preferably, the cmos sensor holder 8 is aligned with the midpoint of the tensile steel wire 7.

Further, the utility model also provides a measuring method of experimental apparatus based on cmos camera demonstration: as shown, the device is adjusted to solve for Δ F by first using the similarity of triangles

Further obtaining F1 and F2 from

Thereby obtaining

Therefore it is sought to

As shown, the length measuring unit of the steel wire based on the cmos camera measurement controls the coms camera 8 to acquire the image of the steel wire 7, and sticks a marker with a known length L0 on the edge of the object surface, measures the corresponding point number of the marker in the machine, calculates the length L1 corresponding to each pixel point, calculates the pixel point number x corresponding to the measured steel wire 7, and obtains the length L of the measured steel wire as xL1 by using a proportional method. And then obtaining the delta L, namely capturing an image by using a cmos camera, recording the initial position and the position of the weight 6, measuring the steel wire descending micro deformation x by using a cmos image proportion method, and obtaining the delta L by force analysis. The diameter S of the wire 7 is measured by a micrometer screw. Substituting into the calculation formula of Young's modulus

The result can be obtained.

Description of the drawings:

FIG. 1 is a schematic diagram of calculating Δ F according to an embodiment of the present invention

Fig. 2 illustrates a principle of calculating Δ L according to an embodiment of the present invention.

Fig. 3 is a schematic structural diagram of the measurement system of the device of the utility model.

The specific implementation mode is as follows:

the invention will be further explained by means of specific examples

The utility model relates to a Young modulus device based on cmos camera demonstration, which comprises a bracket 1; 2. a stabilizing base; 3. a steel wire clamping device; 4. a light fixed ring;5. a weight hook; 6. a weight; 7. stretching the steel wire; a cmos sensor; 9. a computer display screen; two steel wire clamping devices 3 are connected to the support 1, a light fixing ring 4 is fixed to the middle point of a tensile steel wire 7, a weight hook 5 is connected with the light fixing ring 4, a weight 6 is hung on the weight hook 5, and a cmos sensor 8 is connected with a computer display screen 9. As shown, first, the similarity of triangles can be utilized

Further obtaining F1 and F2 from

Thereby obtaining

Therefore it is sought to

As shown, the length measuring unit of the steel wire based on the cmos camera measurement controls the coms camera 8 to acquire the image of the steel wire 7, and sticks a marker with a known length L0 on the edge of the object surface, measures the corresponding point number of the marker in the machine, calculates the length L1 corresponding to each pixel point, calculates the pixel point number x corresponding to the measured steel wire 7, and obtains the length L of the measured steel wire as xL1 by using a proportional method. And then obtaining the delta L, namely capturing an image by using a cmos camera, recording the initial position and the position of the weight 6, measuring the steel wire descending micro deformation x by using a cmos image proportion method, and obtaining the delta L by force analysis. The diameter S of the wire 7 is measured by a micrometer screw. Substituting into the calculation formula of Young's modulus

The result can be obtained. The values of Young's modulus were obtained by substituting the above-mentioned measurement values.

The principle and the implementation of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims (2)

1. A Young modulus device based on cmos camera demonstration mainly comprises a bracket (1); a stabilising base (2); a wire clamping device (3); a light fixed ring (4); a weight hook (5); a weight (6); a drawn steel wire (7); a cmos sensor (8); a display screen (9); connect two steel wires on support (1) and add and hold device (3), its characteristic is: the light fixing ring (4) is fixed at the middle point of the stretching steel wire (7), the weight hook (5) is connected with the light fixing ring (4), the weight (6) is hung on the weight hook (5), and the cmos sensor (8) is connected with the computer display screen (9).

2. The cmos camera demonstration based young's modulus apparatus of claim 1, wherein: the support (1) is two symmetrical structures to two supports are parallel to each other, and support (1) is connected and is the vertical state with tensile steel wire (7), steel wire with holding device (3), just support (1) is connected and is fixed with stabilizing base (2).

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