CN-116379942-B - Device and method for measuring object diameter by light scattering method

CN116379942BCN 116379942 BCN116379942 BCN 116379942BCN-116379942-B

Abstract

The invention discloses a testing device and a testing method for measuring the diameter of an object by a light scattering method, and is characterized by further comprising a movable frame arranged on a support, a laser mechanism arranged on the movable frame in a sliding manner, a driving mechanism arranged on the movable frame and used for driving the laser mechanism to move, a stepping motor arranged on a bottom frame, a rotating arm arranged on the bottom frame and connected with the stepping motor, and a light intensity sensor arranged on the rotating arm. After the position of the semiconductor laser moves, the reflected strongest point of the light intensity changes, the strongest point of the light intensity is automatically captured by the light intensity sensor, so that an accurate incident angle and a reflection angle are obtained, and then the diameter of a cylinder of a measured sample is automatically calculated according to an algorithm, thereby ensuring the accuracy of experiments, being beneficial to the operation of operators and reducing the operation complexity.

Inventors

WANG ZHEN
FANG XUEFENG
QIN AIMIN
YE XU
GUO YING

Assignees

杭州大华仪器制造有限公司

Dates

Publication Date: 20260505
Application Date: 20230408

Claims (5)

1. A testing method of a testing device for measuring the diameter of an object by using a light scattering method is characterized by comprising the following steps: 1) The preparation of the instrument comprises the steps of turning on a power supply of a semiconductor laser and adjusting the power strength of the semiconductor laser; 2) Spot adjusting, namely placing a cylindrical sample in the center of the disc, enabling a laser beam to be shot on the surface of the cylindrical sample, and adjusting a front focusing lens of the semiconductor laser to enable the spot size of the current distance shot on the surface of the cylindrical sample to be minimum; 3) The method comprises the steps of (1) taking down a cylindrical sample from the center of a disc, placing a calibration lens at the zero scale position of the center of the disc, adjusting the positions of a laser beam adjusting frame and a semiconductor laser through a step motor II to enable a laser beam to be incident on the calibration lens, and enabling the laser beam to return to the center position of a light outlet hole of the semiconductor laser after being reflected by the calibration lens, wherein the laser beam passes through the center of a circle; 4) The method comprises the steps of changing the positions of a laser beam adjusting frame and a semiconductor laser through a step motor II, enabling the semiconductor laser to move towards one direction, setting the position of the semiconductor laser as b, setting the moving interval as delta b each time, controlling a step motor with an angle encoder to control a rotating arm to rotate after the moving interval is adjusted, stopping rotating after a light intensity sensor on the rotating arm receives a maximum light intensity signal, automatically recording the angle position 2 alpha and the position b of the semiconductor laser through the angle encoder on the step motor, and then measuring the angle position 2 alpha of a scattering spot after the position b is changed each time by the same method after the position b is changed again according to delta b until the angle 2 alpha is 90 degrees; 5) Setting R as sample radius, b as semiconductor laser position, reflecting after the light beam hits the target, setting the reflecting angle as alpha, and obtaining the reflecting angle by the side reflection of the sample equal to the incident angle alpha according to geometry Defining total reflection angle Obtaining By the variation Deltab of the aiming distance b and the scattering angle Variation of (2) Calculation of differential scattering cross section from experimental data By means of Initially calculating R 0 , measuring the distance R from the scattering center, and then passing Then do The graph, slope K 1 and R 1 were derived by linear fitting; 6) And repeating the data processing process in the step 5) for a plurality of times in an iterative mode until R n+1 is basically consistent with R n , namely, the numerical value of R can be used, and thus, the radius of the cylinder is determined.
2. The method for testing the device for measuring the diameter of the object by using the light scattering method according to claim 1, wherein the testing device comprises a bottom frame (1) and a support (2) arranged on the bottom frame (1), and further comprises a moving frame (3) arranged on the support (2), a laser mechanism (4) arranged on the moving frame (3) in a sliding manner, a driving mechanism (5) arranged on the moving frame (3) and used for driving the laser mechanism (4) to move, a stepping motor (6) arranged on the bottom frame (1), a rotating arm (7) arranged on the bottom frame (1) and connected with the stepping motor (6) and a light intensity sensor (8) arranged on the rotating arm (7), wherein a disc (11) is further arranged on the bottom frame (1), and an angle indication (12) is arranged on the disc (11).
3. A test method of a test device for measuring the diameter of an object by a light scattering method according to claim 2, wherein the stepper motor (6) is connected with an angle encoder.
4. A test method of a test device for measuring the diameter of an object by a light scattering method according to claim 2, wherein the laser mechanism (4) comprises a laser beam adjusting frame (41) slidably mounted on a movable frame (3) and a semiconductor laser (42) mounted on the laser beam adjusting frame (41), and the driving mechanism (5) comprises a step motor II (51) mounted on the movable frame (3), a screw rod (52) connected with the step motor II (51), and a nut seat (53) movably mounted on the screw rod (52) and connected with the laser beam adjusting frame (41).
5. The method for measuring the diameter of an object by using a light scattering method according to claim 4, wherein the moving frame (3) is further provided with a sliding rail (31), and the laser beam adjusting frame (41) is provided with a sliding groove (43) matched with the sliding rail (31).

Description

Device and method for measuring object diameter by light scattering method Technical Field The invention relates to an experiment for testing the diameter of an object by a light scattering method, in particular to a device and a method for testing the diameter of the object by the light scattering method. Background The experimental device substrate for measuring the diameter of an object by using a light scattering method in the prior art comprises a laser, a moving frame for installing the laser, a disc and a moving platform for calibrating a lens, wherein the movement of the laser is manually adjusted every time when the laser irradiates the object, the strongest light intensity point reflected by the laser is found by eyes to obtain an incident angle and a reflecting angle, and then calculation is performed according to the obtained data, but the movement distance of the laser is manually adjusted every time, so that the movement distance of the laser is difficult to ensure consistency, certain deviation can be ensured when the strongest light intensity point is found by eyes, the deviation exists when the obtained incident angle and reflecting angle are correspondingly caused, the deviation appears in the calculated data of the final experiment, the experimental effect is influenced, manual operation is required for each adjustment, the operation is complicated, and the data is inaccurate. For this purpose, a test device for measuring the diameter of an object by a light scattering method and a test method thereof are proposed. Disclosure of Invention The invention aims to solve the problems and provides a testing device and a testing method for measuring the diameter of an object by using a light scattering method. The invention provides a testing device for measuring the diameter of an object by a light scattering method, which comprises a bottom frame and a bracket arranged on the bottom frame, and is characterized by further comprising a moving frame arranged on the bracket, a laser mechanism arranged on the moving frame in a sliding manner, a driving mechanism arranged on the moving frame and used for driving the laser mechanism to move, a stepping motor arranged on the bottom frame, a rotating arm arranged on the bottom frame and connected with the stepping motor, and a light intensity sensor arranged on the rotating arm, wherein a disc is also arranged on the bottom frame, and an angle indication is arranged on the disc. Further preferably, the stepper motor is connected with an angle encoder. Further preferably, the laser mechanism comprises a laser beam adjusting frame and a semiconductor laser, wherein the laser beam adjusting frame is slidably arranged on the movable frame, the semiconductor laser is arranged on the laser beam adjusting frame, and the driving mechanism comprises a step motor II arranged on the movable frame, a screw rod connected with the step motor and a nut seat movably arranged on the screw rod and connected with the laser beam adjusting frame. Further preferably, the moving frame is further provided with a sliding rail, and the laser beam adjusting frame is provided with a sliding groove matched with the sliding rail. A testing method of a testing device for measuring the diameter of an object by using a light scattering method is characterized by comprising the following steps: 1) The preparation of the instrument comprises the steps of turning on a power supply of a semiconductor laser and adjusting the power strength of the semiconductor laser; 2) Spot adjusting, namely placing a cylindrical sample in the center of the disc, enabling a laser beam to be shot on the surface of the cylindrical sample, and adjusting a front focusing lens of the semiconductor laser to enable the spot size of the current distance shot on the surface of the cylindrical sample to be minimum; 3) The method comprises the steps of (1) taking down a cylindrical sample from the center of a disc, placing a calibration lens at the zero scale position of the center of the disc, adjusting the positions of a laser beam adjusting frame and a semiconductor laser through a step motor II to enable a laser beam to be incident on the calibration lens, and enabling the laser beam to return to the center position of a light outlet hole of the semiconductor laser after being reflected by the calibration lens, wherein the laser beam passes through the center of a circle; 4) The method comprises the steps of changing the positions of a laser beam adjusting frame and a semiconductor laser through a step motor II, enabling the semiconductor laser to move towards one direction, setting the position of the semiconductor laser as b, setting the moving interval as delta b each time, controlling a step motor with an angle encoder to control a rotating arm to rotate after the moving interval is adjusted, stopping rotating after a light intensity sensor on the rotating arm receives a maximum light intensity signal (namel