Intelligent measuring device for wavelength of laser light source

Abstract

The application discloses an intelligent measuring device for the wavelength of a laser light source, which comprises an interference ring stripe throughput phenomenon counting system, a continuous optical path difference generating and recording system, an upper computer related program system, an experimental platform and an integrated distribution box; the integrated distribution box is used for providing power supply for the above-mentioned other systems and the platform; the experimental platform comprises an interference phenomenon generating optical path system, an optical fiber target and an error operation emergency stop system; the upper computer and the program system thereof comprise a data transceiving and real-time monitoring module, a throughput counting module and an optical path difference generating and recording module; the continuous optical path difference generating and recording system is composed of a movable total reflection mirror, a transmission gear set, a two-phase stepping motor, a stepping motor driver and an STM32 single-chip microcomputer; the user inputs measuring information at the upper computer end, the instrument automatically generates a continuously changing phase difference, forms a throughput phenomenon and automatically records the throughput times, so as to calculate the wavelength of the laser light. The structure is simple, safe and reliable.

Description

Technical Field

[0001] This invention relates to an intelligent measurement device for the wavelength of a laser source, belonging to the field of optoelectronic information engineering technology. Background Technology

[0002] Interference is a common physical optics phenomenon. It has wide applications in industrial testing and cutting-edge science, such as observing gravitational waves using laser interference and measuring the thickness of extremely thin metal strips using white light interference. The application of the Michelson interferometer in measuring laser wavelength helps students understand physical phenomena and provides a case study for moving from theory to practice; therefore, it is one of the essential experiments in basic physics education at universities. However, existing instruments still rely on manual control, making operation complex and requiring prolonged observation of the laser interference rings. Prolonged observation can damage students' eyesight, and vibrations from the building and floor can cause jitter in the interference image, making it difficult for students to count the rings. Furthermore, the measured laser wavelength has a large error, failing to achieve the desired experimental results. Summary of the Invention

[0003] In view of the problems existing in the prior art, the present invention provides an intelligent measurement device for the wavelength of a laser source, thereby solving the above-mentioned technical problems.

[0004] To achieve the above objectives, the technical solution adopted by this invention is: an intelligent measurement device for the wavelength of a laser source, comprising an experimental platform, an integrated power distribution box, a host computer and its program system, a continuous optical path difference generation and recording system, and an interference ring throughput phenomenon counting system; the integrated power distribution box is used to provide power supply for the other systems and the platform; the experimental platform includes an interference phenomenon generation optical path system, an optical fiber target, and an error operation emergency stop system; the host computer and its program system include a data transmission and real-time monitoring module, a throughput counting module, and an optical path difference generation and recording module; the continuous optical path difference generation and recording system consists of a movable total reflection mirror, a transmission gear set, a two-phase stepper motor, a stepper motor driver, and an STM32 microcontroller; the interference ring throughput phenomenon counting system is used to first determine the standard state of the rings before and after the occurrence of the throughput phenomenon, and then record it once each time the throughput reaches this state.

[0005] Furthermore, in the experimental platform, the interference phenomenon generating optical path system is used to generate interference rings with the laser; the optical fiber target is used to transmit the light intensity information of a point of the interference ring to the interference ring throughput phenomenon counting system for analysis; the error operation emergency stop system is equipped with two U-shaped photoelectric gates on the transmission shaft, which are connected to the microcontroller. It is used to stop the entire experiment when the movable reflector moves to a position that may damage the instrument and to issue a warning to the user.

[0006] Furthermore, in the host computer and its program system, the data transmission and real-time monitoring module is used to configure the data transmission port, throughput, and stepper motor movement direction of the host computer program; after the measurement starts, it displays the real-time functional relationship between the number of pulses sent and the throughput to the user; after the measurement ends, it feeds back the obtained data to the user, and relevant data programs analyze it; the throughput counting module is used to record the number of times the throughput phenomenon occurs and upload it back to the host computer; the optical path difference generation and recording module is used to cause the movable reflector to move, record the real-time displacement magnitude, and upload the pulse count to the host computer.

[0007] Furthermore, the integrated power distribution box includes: fixing and wiring of each functional module, a high-voltage AC to DC power conversion module, a laser power supply module, and debugging buttons; fixing and wiring of each functional module: all lines and functional modules are centralized to prevent human-caused damage to the lines and circuit boards; the high-voltage AC to DC power conversion module includes an air switch, a power supply unit, and terminal blocks, used to convert 220V / 50HZ AC power into 24V DC power, which is then distributed to each functional module via the terminal blocks, and the indicator light flashes after power is applied; the laser power supply module is used to convert 24V DC power into any DC power between 1V and 24V to supply the laser; there are three debugging buttons, which control the forward, reverse, and stop of the stepper motor, allowing the experimenter to observe the experimental phenomena without a host computer.

[0008] Furthermore, the continuous optical path difference generation and recording system comprises a movable total reflection mirror, a transmission gear set, a two-phase stepper motor, a stepper motor driver, and an STM32 microcontroller. The STM32 microcontroller, through programming, can send pulses to the stepper motor driver at a rated speed and simultaneously record the number of pulses sent. The stepper motor driver can convert the sent pulses into the rotation amount of the stepper motor, and the amount of rotation that one pulse can drive the stepper motor to is constant. The transmission gear set drives the movable total reflection mirror to translate. Since there is a proportional relationship between the gear sets, there is a direct proportional relationship between the number of pulses and the displacement of the movable reflection mirror, thereby generating a continuously changing optical path difference and accurately recording its magnitude.

[0009] A method for measuring the wavelength of a laser source using an intelligent measuring device, comprising the following specific steps:

[0010] Step 1: The optical fiber target transmits the light information from a point on the throughput ring to a PN-type photodiode. The photodiode converts the change in light intensity in the optical fiber into a change in current, acting as a changing current source, thereby converting the optical signal into an analog electrical signal. Furthermore, this photodiode can be replaced with a PN-type or PIN-type photodiode that is more sensitive to the color of the light source. A resistor is connected in series with it, and the voltage across this resistor is the input voltage, thus converting the optical signal into an analog electrical signal.

[0011] Step 2: The voltage comparator module can set its own threshold. When the input voltage is higher than the comparison voltage, it outputs a high level; when the input voltage is lower than the comparison voltage, it outputs a low level. All output signals are digital signals.

[0012] Step 3: After the digital signal enters the microcontroller, it performs counting. The core of the microcontroller's counting algorithm is interrupt counting. When the photodiode outputs a falling edge signal, the microcontroller's interrupt service is triggered. When the interrupt is triggered for the first time, the ring pattern at the optical fiber changes from a bright ring to a dark ring, thus eliminating the stepper motor's idle error. At this time, the ring count is assigned 0, and the pulse count is recorded. Subsequently, each time the interrupt service is entered, the ring count is incremented by 1, and the number of pulses sent at that time is recorded. Under the throughput set by the user, the relative displacement of the moving mirror and the corresponding throughput are output and sent to the host computer via serial communication for further processing.

[0013] Furthermore, a capacitor is connected to the output port of the voltage comparator module, with one end of the capacitor connected to the output port and the other end grounded.

[0014] The beneficial effects of this invention are: the device and method allow users to conveniently input measurement information on a host computer, the instrument automatically generates a continuously changing phase difference, forming a throughput phenomenon, and automatically records the number of throughputs, thereby calculating the laser wavelength. This solves the problems of complex measurements, long measurement times, and prolonged visual observation of laser interference rings in existing technologies. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the device structure of the present invention;

[0016] Figure 2 This is a schematic diagram of the workflow of the present invention. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of the invention.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention.

[0019] like Figure 1 , Figure 2As shown, an intelligent measurement device for the wavelength of a laser source is disclosed. The device includes an experimental platform, an integrated power distribution box, a host computer and its program system, a continuous optical path difference generation and recording system, and an interference ring throughput phenomenon counting system. The integrated power distribution box provides power to the other systems and the platform. The experimental platform includes an interference phenomenon generation optical path system, an optical fiber target, and an error operation emergency stop system. The host computer and its program system include a data transmission and real-time monitoring module, a throughput counting module, and an optical path difference generation and recording module. The continuous optical path difference generation and recording system consists of a movable total reflection mirror, a transmission gear set, a two-phase stepper motor, a stepper motor driver, and an STM32 microcontroller. The interference ring throughput phenomenon counting system is used to first determine the standard state of the rings before and after the occurrence of the throughput phenomenon, and then record it once each time the throughput reaches this state.

[0020] In this preferred embodiment, the experimental platform includes an interference phenomenon generating optical path system used to generate interference rings with the laser; an optical fiber target used to transmit the light intensity information of a point on the interference ring to the interference ring throughput phenomenon counting system for analysis; and an error operation emergency stop system with two U-shaped photoelectric gates on the drive shaft connected to a microcontroller, which can stop the entire experiment and issue a warning to the user when the movable reflector moves to a point that may damage the instrument.

[0021] In this preferred embodiment, within the host computer and its program system, the data transmission and real-time monitoring module is used to configure the data transmission port, throughput, and stepper motor movement direction in the host computer program; after the measurement begins, it displays the real-time functional relationship between the number of pulses sent and the throughput to the user; after the measurement ends, it feeds back the obtained data to the user, and a relevant data program analyzes it; the throughput counting module is used to record the number of times the throughput phenomenon occurs and upload it back to the host computer; the optical path difference generation and recording module is used to cause the movable reflector to move, record the real-time displacement magnitude, and upload the pulse count to the host computer.

[0022] In this preferred embodiment, the integrated distribution box includes: fixing and wiring of each functional module, a high-voltage AC to DC power conversion module, a laser power supply module, and debugging buttons; fixing and wiring of each functional module: all lines and functional modules are centralized to prevent human-caused damage to the lines and circuit boards; the high-voltage AC to DC power conversion module includes an air switch, a power supply unit, and terminal blocks, used to convert 220V / 50HZ AC power into 24V DC power, which is then distributed to each functional module by the terminal blocks, and the indicator light flashes after power is applied; the laser power supply module is used to convert 24V DC power into any DC power between 1V and 24V to supply the laser; there are three debugging buttons, which control the forward, reverse, and stop of the stepper motor, allowing the experimenter to observe the experimental phenomena without a host computer.

[0023] In this preferred embodiment, the continuous optical path difference generation and recording system comprises a movable total reflection mirror, a transmission gear set, a two-phase stepper motor, a stepper motor driver, and an STM32 microcontroller. The STM32 microcontroller, through a program, can send pulses to the stepper motor driver at a rated speed and simultaneously record the number of pulses sent. The stepper motor driver can convert the sent pulses into the rotation amount of the stepper motor, and the amount of rotation that one pulse can drive the stepper motor to is constant. The transmission gear set drives the movable total reflection mirror to translate. Since there is a proportional relationship between the gear sets, there is a direct proportional relationship between the number of pulses and the displacement of the movable reflection mirror, thereby generating a continuously changing optical path difference and accurately recording its magnitude.

[0024] A method for measuring the wavelength of a laser source using an intelligent measuring device, comprising the following specific steps:

[0025] Step 1: The optical fiber target transmits the light information from a point on the throughput ring to a PN-type photodiode. The photodiode converts the change in light intensity in the optical fiber into a change in current, acting as a changing current source, thereby converting the optical signal into an analog electrical signal. Furthermore, this photodiode can be replaced with a PN-type or PIN-type photodiode that is more sensitive to the color of the light source. A resistor is connected in series with it, and the voltage across this resistor is the input voltage, thus converting the optical signal into an analog electrical signal.

[0026] Step 2: The voltage comparator module can set its own threshold. When the input voltage is higher than the comparison voltage, it outputs a high level; when the input voltage is lower than the comparison voltage, it outputs a low level. All output signals are digital signals.

[0027] Step 3: After the digital signal enters the microcontroller, it performs counting. The core of the microcontroller's counting algorithm is interrupt counting. When the photodiode outputs a falling edge signal, the microcontroller's interrupt service is triggered. When the interrupt is triggered for the first time, the ring pattern at the optical fiber changes from a bright ring to a dark ring, thus eliminating the stepper motor's idle error. At this time, the ring count is assigned 0, and the pulse count is recorded. Subsequently, each time the interrupt service is entered, the ring count is incremented by 1, and the number of pulses sent at that time is recorded. Under the throughput set by the user, the relative displacement of the moving mirror and the corresponding throughput are output and sent to the host computer via serial communication for further processing.

[0028] In this preferred embodiment, the output port of the voltage comparator module is connected to a capacitor, with one end of the capacitor connected to the output port and the other end grounded.

[0029] The comparison results obtained from manual measurements are shown in the table below:

[0030]

[0031] Table 1

[0032] The measurement results of this device in Example 1 are shown in Table 2 below:

[0033]

[0034] Table 2

[0035] The measurement results of this device in Example 2 are shown in Table 3 below:

[0036]

[0037] Table 3

[0038] By comparing the comparative example with the two embodiments, we can conclude that:

[0039] A comparison of the results obtained using this experimental setup with those obtained manually clearly reveals the following:

[0040] (1) The relative error obtained from the measurement was accurate by 3 orders of magnitude.

[0041] (2) The time required for measurement has been reduced by more than 50%.

[0042] (2) The measurement process of this experimental device is fully automated, and there is no need to observe the laser interference ring pattern throughout the measurement process.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An intelligent measurement device for the wavelength of a laser source, characterized in that, The device includes an experimental platform, an integrated power distribution box, a host computer and its program system, a continuous optical path difference generation and recording system, and an interference ring throughput phenomenon counting system. The integrated power distribution box provides power to the other systems and the platform. The experimental platform includes an interference phenomenon generation optical path system, an optical fiber target, and an emergency stop system for erroneous operations. The host computer and its program system include a data transmission and real-time monitoring module, a throughput counting module, and an optical path difference generation and recording module. The continuous optical path difference generation and recording system consists of a movable total reflection mirror, a transmission gear set, a two-phase stepper motor, a stepper motor driver, and an STM32 microcontroller. The interference ring throughput phenomenon counting system is used to first determine the standard state of the rings before and after the occurrence of the throughput phenomenon, and then record it once each time the throughput reaches this state. In the experimental platform, the optical path system for generating interference phenomena is used to induce interference rings in the laser. The optical fiber target is used to transmit the light intensity information of a point of interference ring to the interference ring throughput phenomenon counting system for analysis; the error operation emergency stop system is equipped with two U-shaped photoelectric gates on the drive shaft, which are connected to the microcontroller. It is used to stop the entire experiment and issue a warning to the user when the movable reflector moves to a position that may damage the instrument. In the host computer and its program system, the data transceiver and real-time monitoring module is used to configure the data transmission port, throughput, and stepper motor movement direction of the host computer program; after the measurement starts, it displays the real-time functional relationship between the number of pulses sent and the throughput to the user; after the measurement ends, it feeds back the obtained data to the user, and relevant data programs analyze it; the throughput counting module is used to record the number of times the throughput phenomenon occurs and upload it back to the host computer; the optical path difference generation and recording module is used to cause the movable reflector to move, record the real-time displacement magnitude, and upload the pulse count to the host computer. The integrated power distribution box includes: fixing and wiring of each functional module, a high-voltage AC to DC power conversion module, a laser power supply module, and debugging buttons; fixing and wiring of each functional module: all lines and functional modules are centralized to prevent human-caused damage to the lines and circuit boards; the high-voltage AC to DC power conversion module includes an air switch, a power supply unit, and terminal blocks, used to convert 220V / 50HZ AC power to 24V DC power, which is then distributed to each functional module via the terminal blocks, and the indicator light flashes after power is applied; the laser power supply module is used to convert 24V DC power to any DC power between 1V and 24V to supply the laser; there are three debugging buttons, which control the forward, reverse, and stop of the stepper motor, allowing the experimenter to observe the experimental phenomena without a host computer; The continuous optical path difference generation and recording system consists of a movable total reflection mirror, a transmission gear set, a two-phase stepper motor, a stepper motor driver, and an STM32 microcontroller. The STM32 microcontroller, through programming, can send pulses to the stepper motor driver at a rated speed and simultaneously record the number of pulses sent. The stepper motor driver can convert the sent pulses into the rotation amount of the stepper motor, and the amount of rotation that one pulse can drive the stepper motor to is constant. The transmission gear set drives the movable total reflection mirror to translate. Since there is a proportional relationship between the gear sets, there is a direct proportional relationship between the number of pulses and the displacement of the movable reflection mirror, thereby generating a continuously changing optical path difference and accurately recording its magnitude.

2. The measurement method of the intelligent measurement device for laser light source wavelength according to claim 1, characterized in that, The specific steps are as follows: Step 1: The optical fiber target transmits the light information from a point on the throughput ring to a PN-type photodiode. The photodiode converts the change in light intensity in the optical fiber into a change in current, acting as a changing current source, thereby converting the optical signal into an analog electrical signal. Furthermore, this photodiode can be replaced with a PN-type or PIN-type photodiode that is more sensitive to the color of the light source. A resistor is connected in series with this photodiode; the voltage across this resistor is the input voltage, thus converting the optical signal into an analog electrical signal. Step 2: The voltage comparator module can set its own threshold. When the input voltage is higher than the comparison voltage, it outputs a high level; when the input voltage is lower than the comparison voltage, it outputs a low level. All output signals are digital signals. Step 3: After the digital signal enters the microcontroller, it performs counting. The core of the microcontroller's counting algorithm is interrupt counting. When the photodiode outputs a falling edge signal, the microcontroller's interrupt service is triggered. When the interrupt is triggered for the first time, the ring pattern at the optical fiber changes from a bright ring to a dark ring, thus eliminating the stepper motor's idle error. At this time, the ring count is assigned 0, and the pulse count is recorded. Subsequently, each time the interrupt service is entered, the ring count is incremented by 1, and the number of pulses sent at that time is recorded. Under the throughput set by the user, the relative displacement of the moving mirror and the corresponding throughput are output and sent to the host computer via serial communication for further processing.

3. The measurement method of the intelligent measurement device for laser light source wavelength according to claim 2, characterized in that, The output port of the voltage comparator module is connected to a capacitor, with one end of the capacitor connected to the output port and the other end grounded.

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