CN205068959U - Single slit diffraction light intensity testing arrangement - Google Patents

Abstract

The utility model provides a single-slit diffraction light intensity testing device, which includes a stepping motor, and is characterized in that: the output shaft of the stepping motor is connected to a screw, the screw is provided with a nut, and the nut is provided with a light intensity The detection chip, the stepper motor and the light intensity detection chip are connected to a controller, and the controller is connected to a display screen and a keyboard. The utility model simplifies the experimental process of single-slit diffraction, and the direct appearance of images on the computer enables students to understand the phenomenon of single-slit diffraction more intuitively, instead of obtaining a lot of abstract data. It can also allow students to observe the whole experiment process more intuitively, gain more experience in the single-slit diffraction experiment during the observation process, and stimulate interest in exploring the experiment in depth. The light intensity measured by the light intensity detection chip is transmitted to the computer through the controller, which avoids a large number of duplicate calculations and improves the accuracy.

Description

A single-slit diffraction light intensity test device

technical field

The utility model relates to the field of physical experiment instruments, in particular to a single-slit diffraction light intensity testing device.

Background technique

The single-slit diffraction experiment is one of the most important optical experiments in university physics. Calculating the grating constant from the single-slit diffraction fringes is an important purpose of the experiment. Now the measuring instrument used in the laboratory is a digital galvanometer. In the experiment, a photoelectric probe is used to detect the light intensity distribution, and the light intensity data at each position is converted into currents of different sizes and displayed on the digital galvanometer. The wheel records data every 0.5mm, and a large amount of data needs to be recorded. After a large amount of experimental data is recorded, the distance from the main pole to the first pole is found, and the diffraction pattern is obtained by calculation and drawing. When the handwheel is turned, there may be a reversal, etc., which can easily cause errors and make the measurement results inaccurate.

Invention content:

The technical problem to be solved by the utility model is to provide a single-slit diffraction light intensity test device, which makes the single-slit diffraction experiment process more concise, and the direct appearance of images enables students to understand the single-slit diffraction phenomenon more intuitively.

The utility model adopts following technical scheme to realize the object of the invention:

A single-slit diffraction light intensity testing device, comprising a stepping motor, characterized in that: the output shaft of the stepping motor is connected to a screw, the screw is provided with a nut, the nut is provided with a light intensity detection chip, the The stepper motor and the light intensity detection chip are connected to a controller, and the controller is connected to a display screen and a keyboard.

As a further limitation to the technical solution, the screw is arranged on the base.

As a further limitation to this technical solution, the model of the light intensity detection chip is BH1750.

As a further limitation to this technical solution, the controller is a STC89C52 single-chip microcomputer.

As a further limitation to this technical solution, the pin P1.0 and pin P1.1 of the STC89C52 single-chip microcomputer are connected to the light intensity detection chip, and the pin P3.0 and pin P3.1 of the STC89C52 single-chip microcomputer are connected through the serial port The data line is connected to the computer, and the pin P0.1, pin P0.1, pin P0.2 and pin P0.3 of the STC89C52 microcontroller are connected to the motor drive chip, and the motor drive chip is connected to the drive motor.

As a further limitation to this technical solution, the motor driver chip adopts ULN2003A.

As a further limitation to this technical solution, the model of the display screen is LM016L.

Compared with the prior art, the advantages and positive effects of the utility model are: the utility model simplifies the single-slit diffraction experiment process, and the direct appearance of images on the computer enables students to understand the single-slit diffraction phenomenon more intuitively, instead of obtaining A lot of abstract data can also allow students to observe the whole experiment process more intuitively. During the observation process, they can have more experience in the single-slit diffraction experiment and stimulate their interest in exploring the experiment in depth. The light intensity measured by the light intensity detection chip is transmitted to the computer through the controller, which avoids a large number of duplicate calculations and improves the accuracy.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2 is a schematic block diagram of the utility model.

In the figure, 1. base, 2. stepping motor, 3. screw, 4. nut, 5. light intensity detection chip.

detailed description:

Below in conjunction with embodiment, further illustrate the utility model.

Referring to Fig. 1 and Fig. 2, the utility model comprises a stepper motor 2, the output shaft of the stepper motor 2 is connected to a screw rod 3, the screw rod 3 is provided with a nut 4, and the nut 4 is provided with a light intensity detection chip 5. The stepper motor 2 and the light intensity detection chip 5 are connected to a controller, and the controller is connected to a display screen and a keyboard.

The screw 3 is arranged on the base 1 , the bottom of the light intensity detection chip 5 is in contact with the base 1 , and the rotation of the nut 4 drives the light intensity detection chip 5 to move back and forth along the screw 3 .

The model of the light intensity detection chip 5 is BH1750.

Described controller is STC89C52 single-chip microcomputer.

The pin P1.0 and pin P1.1 of the STC89C52 single-chip microcomputer are connected to the light intensity detection chip, the pin P3.0 and the pin P3.1 of the STC89C52 single-chip microcomputer are connected to the computer through a serial port data line, and the STC89C52 The pin P0.1, pin P0.1, pin P0.2 and pin P0.3 of the single chip microcomputer are connected to the motor drive chip, and the motor drive chip is connected to the drive motor.

The motor driver chip adopts ULN2003A.

The model of the display screen is LM016L.

In order to realize the automation and high precision of the experimental measurement, we use the STC89C52 single-chip microcomputer to control the rotation of the driving motor 2, and drive the light intensity detection chip 5 to move at a constant speed. The light intensity detection chip 5 is facing the laser emission source. , automatically record the light intensity data at equal intervals, display the data on the LCD1602 display screen and transmit the data to the computer through the serial port data line, realize the real-time display of the light intensity of the diffraction fringes, and draw the light intensity distribution image. The main image can be obtained from the image The grating constant d is calculated from the distance a from the extremely strong to the first extremely weak through the formula, which is a conventional technique and will not be repeated here.

Claims (7)

1. A single-slit diffraction light intensity testing device, comprising a stepper motor, is characterized in that: the output shaft of the stepper motor is connected to a screw rod, the screw rod is provided with a nut, and the nut is provided with a light intensity detection chip , the stepper motor and the light intensity detection chip are connected to a controller, and the controller is connected to a display screen and a keyboard. 2. The single-slit diffraction light intensity testing device according to claim 1, characterized in that: the screw is arranged on the base. 3. The single-slit diffraction light intensity test device according to claim 1, characterized in that: the model of the light intensity detection chip is BH1750. 4. The single-slit diffraction light intensity testing device according to claim 3, characterized in that: the controller is a STC89C52 single-chip microcomputer. 5. The single-slit diffraction light intensity testing device according to claim 4, characterized in that: the pin P1.0 and pin P1.1 of the STC89C52 single-chip microcomputer are connected to the light intensity detection chip, and the pin P1.1 of the STC89C52 single-chip microcomputer Pin P3.0 and pin P3.1 are connected to the computer through the serial port data line, and the STC89C52 microcontroller is connected to the motor driver through the pin P0.1, pin P0.1, pin P0.2 and pin P0.3 chip, the motor drive chip is connected to the drive motor. 6. The single-slit diffraction light intensity test device according to claim 5, characterized in that: the motor drive chip is ULN2003A. 7. The single-slit diffraction light intensity test device according to any one of claims 1-6, characterized in that: the model of the display screen is LM016L.