A photodiode output effect detection device
By constructing a photodiode detection system that combines signal generation, transmission, and data processing, the problems of complexity and slow response speed of existing detection methods are solved, achieving simple, fast, and accurate photodiode detection, and improving detection accuracy and response speed.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- TIANJIN FIGARO ELECTRONICS
- Filing Date
- 2025-06-04
- Publication Date
- 2026-07-24
AI Technical Summary
Existing photodiode detection methods are complex and have slow response speeds, failing to meet the demands for high-precision and high-efficiency real-time detection.
A detection system consisting of a waveform generator, power amplifier, laser source, photodiode, digital multimeter, and computer is used to evaluate the response linearity of the photodiode by generating and processing signals, and to evaluate the performance of the photodiode by calculating linear fitting and correlation coefficient.
It enables simple, fast, and accurate photodiode detection, reduces the impact of environmental factors, and improves detection accuracy and response speed.
Smart Images
Figure CN224553410U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of optical measurement, and more specifically, to a device for measuring the linearity of the response of a photodiode that is simple to operate and low in cost. Background Technology
[0002] Photodiodes, semiconductor devices that convert light signals into electrical signals, are widely used in optical communication, laser ranging, medical imaging, spectral analysis, and many other fields. The working principle of a photodiode is to excite electrons with photons, generating a photocurrent. Therefore, its performance directly affects the signal transmission quality and stability of the system. However, in practical applications, photodiodes are affected by various factors such as environment, materials, and structure, which may lead to attenuation of output performance, increased noise, and slow response, resulting in decreased measurement accuracy and even system failure.
[0003] Currently, the detection of photodiode output performance mainly relies on the real-time monitoring and analysis of its current and voltage signals. Common detection methods include those based on parameters such as photocurrent response, frequency response, dark current, and photoelectric conversion efficiency. However, these methods often suffer from drawbacks such as complex detection processes, slow response speeds, or sensitivity to environmental changes, failing to meet the demands for high-precision and high-efficiency real-time detection.
[0004] Therefore, improving the detection method for photodiode output performance to enhance its accuracy and response speed has become an important research direction. This invention proposes a novel method for detecting photodiode output performance. By optimizing the detection process and parameters, it enables more accurate evaluation of the photodiode's operating status in a shorter time, thereby improving the stability and reliability of photodiodes in various applications. Utility Model Content
[0005] To solve the above problems, this invention can effectively evaluate the output performance of the photodiode under test.
[0006] The technical solution adopted in this utility model is: The photodiode output effect detection device includes a waveform generator, a power amplifier, and a laser source connected in sequence. A photodiode, a digital multimeter, and a computer are also connected in sequence. The laser source emits laser light to the photodiode. (1) Waveform generator: used to generate the required signal type, including sawtooth wave, square wave or triangle wave, and to set the frequency and amplitude parameters; (2) Power amplifier: used to receive the signal output by the waveform generator and enhance the signal strength to ensure that the laser source can be driven sufficiently; (3) Laser source: used to receive the signal output from the power amplifier and emit laser light to the photodiode; (4) Photodiode: receives laser light and converts it into an electric current signal; (5) Digital multimeter: used to accurately measure the current signal generated by the photodiode; (6) Computer: Used to receive the measured current signal, perform data analysis and linear fitting, calculate the coefficient of determination, standard error and correlation coefficient, and thus evaluate the response linearity of the photodiode.
[0007] The method for measuring the linearity of a photodiode response comprises the following steps: 1. Use a waveform generator to design the required signal type (e.g., sawtooth wave, square wave, triangle wave, etc.) according to the experimental requirements, and set the signal parameters such as frequency and amplitude. Output the designed signal to the power amplifier.
[0008] Second, the power amplifier receives the signal output from the waveform generator and amplifies it to ensure that the signal power is strong enough to drive the laser source. The amplified signal is then transmitted to the laser source to provide the corresponding driving signal.
[0009] 3. After receiving the signal output by the power amplifier, the laser source emits laser light according to the signal.
[0010] IV. When a photodiode is within the irradiation range of a laser beam, it receives the laser light emitted from the laser source. The photodiode then converts the laser signal into a corresponding current signal.
[0011] 5. Use a digital multimeter to measure the current signal generated by the photodiode. The multimeter can detect the intensity and changes in current. Record the current signal I displayed by the multimeter for subsequent analysis.
[0012] 6. The current signal I recorded by the multimeter is transmitted to the computer, where specialized software further processes the signal. The computer evaluates the processed signal, analyzes the performance of the laser source, photodiode, and other systems, and derives relevant results.
[0013] The quality of the measured signal is evaluated using the following processing methods: 1. Perform linear fitting on the collected current data to evaluate the relationship between the data and the model.
[0014] 2. Calculate R 2 Value (coefficient of determination)
[0015] Among them, I iThis is the true value of the measured current. It is a predicted value; It is the average of the true values.
[0016] The correlation coefficient is used to determine the degree of data fit. Its value is between 0 and 1. The closer the value is to 1, the better the model fits the data.
[0017] 3. Calculate the standard error (SE).
[0018] Standard error represents the average error between the predicted and actual values of a regression model. It is commonly used to measure the accuracy and predictive power of a model. Standard error can indirectly reflect the linearity of the model fit. A large standard error may indicate the presence of non-linear relationships in the data, where the regression line fails to capture the data's changing trends effectively, resulting in poor linearity. Therefore, a smaller standard error usually indicates a stronger linear relationship in the data, and the regression model is able to effectively capture this relationship.
[0019] 4. Calculate the correlation coefficient (r).
[0020] Where x is the horizontal axis value corresponding to the measured current value.
[0021] The correlation coefficient measures the strength and direction of the linear relationship between an independent variable and a dependent variable. Its value ranges from -1 to +1; values close to 1 or -1 indicate a strong linear relationship, while values close to 0 indicate a weak or non-existent linear relationship. Positive values indicate a positive correlation, and negative values indicate a negative correlation.
[0022] Based on the above data processing methods, the collected data can be processed to evaluate the quality of the output photodiode signal.
[0023] Through these steps, the entire system can realize the complete process from signal generation, transmission, laser emission, photodiode detection to signal processing and evaluation.
[0024] Compared with the prior art, this utility model has the following beneficial effects: This invention combines a waveform generator, a digital multimeter, and other equipment to construct a complete photodiode output effect detection system. The complete instrumentation ensures the integrity of the detection signal, while subsequent data processing methods guarantee the reliability of the detection results. Therefore, this invention features simple operation, high detection accuracy, and fast response speed, while reducing the influence of environmental factors on the measurement results, ensuring more scientific and reliable results. Attached Figure Description
[0025] The following description, in conjunction with the figures of this utility model, provides further details: Figure 1 This is a schematic diagram of the present invention.
[0026] In the diagram, 1. Waveform generator, 2. Power amplifier, 3. Laser source, 4. Photodiode, 5. Digital multimeter, 6. Computer. Detailed Implementation
[0027] The present invention will be further described below with reference to the accompanying drawings.
[0028] like Figure 1 This is a schematic diagram of the present invention. The device mainly includes a photodiode under test, a digital multimeter, a waveform generator, a power amplifier, a laser source, a computer, and several connecting wires. The waveform generator generates a signal as needed, and the power amplifier amplifies the signal to provide a corresponding signal to the laser source. The laser source emits laser light to provide a light source for the photodiode. After receiving the laser signal, the photodiode generates a current signal, which is detected and recorded using the digital multimeter. The computer performs signal processing and evaluation.
[0029] The method for measuring the linearity of a photodiode response comprises the following steps: 1. Use a waveform generator to design the required signal type (e.g., sawtooth wave, square wave, triangle wave, etc.) according to the experimental requirements, and set the signal parameters such as frequency and amplitude. Output the designed signal to the power amplifier.
[0030] Second, the power amplifier receives the signal output from the waveform generator and amplifies it to ensure that the signal power is strong enough to drive the laser source. The amplified signal is then transmitted to the laser source to provide the corresponding driving signal.
[0031] 3. After receiving the signal output by the power amplifier, the laser source emits laser light according to the signal.
[0032] IV. When a photodiode is within the irradiation range of a laser beam, it receives the laser light emitted from the laser source. The photodiode then converts the laser signal into a corresponding current signal.
[0033] 5. Use a digital multimeter to measure the current signal generated by the photodiode. The multimeter can detect the intensity and changes in current. Record the current signal I displayed by the multimeter for subsequent analysis.
[0034] 6. The current signal I recorded by the multimeter is transmitted to the computer, where specialized software further processes the signal. The computer evaluates the processed signal, analyzes the performance of the laser source, photodiode, and other systems, and derives relevant results.
[0035] The quality of the measured signal is evaluated using the following processing methods: 1. Perform linear fitting on the collected current data to evaluate the relationship between the data and the model.
[0036] 2. Calculate R 2 Value (coefficient of determination)
[0037] Among them, I i This is the true value of the measured current. It is a predicted value; It is the average of the true values.
[0038] The correlation coefficient is used to determine the degree of data fit. Its value is between 0 and 1. The closer the value is to 1, the better the model fits the data.
[0039] 3. Calculate the standard error (SE).
[0040] Standard error represents the average error between the predicted and actual values of a regression model. It is commonly used to measure the accuracy and predictive power of a model. Standard error can indirectly reflect the linearity of the model fit. A large standard error may indicate the presence of non-linear relationships in the data, where the regression line fails to capture the data's changing trends effectively, resulting in poor linearity. Therefore, a smaller standard error usually indicates a stronger linear relationship in the data, and the regression model is able to effectively capture this relationship.
[0041] 4. Calculate the correlation coefficient (r).
[0042] Where x is the horizontal axis value corresponding to the measured current value.
[0043] The correlation coefficient measures the strength and direction of the linear relationship between an independent variable and a dependent variable. Its value ranges from -1 to +1; values close to 1 or -1 indicate a strong linear relationship, while values close to 0 indicate a weak or non-existent linear relationship. Positive values indicate a positive correlation, and negative values indicate a negative correlation.
[0044] Through these steps, this invention enables the complete process from signal generation, transmission, laser emission, photodiode detection to signal processing and evaluation.
Claims
1. A photodiode output effect detection device, characterized in that, The system includes a waveform generator, a power amplifier, and a laser source connected in sequence; a photodiode, a digital multimeter, and a computer are also connected in sequence; the laser source emits laser light to the photodiode, wherein: (1) Waveform generator: used to generate the required signal type, including sawtooth wave, square wave or triangle wave, and to set the frequency and amplitude parameters; (2) Power amplifier: used to receive the signal output by the waveform generator and enhance the signal strength to ensure that the laser source can be driven sufficiently; (3) Laser source: used to receive the signal output from the power amplifier and emit laser light to the photodiode; (4) Photodiode: receives laser light and converts it into an electric current signal; (5) Digital multimeter: used to accurately measure the current signal generated by the photodiode; (6) Computer: Used to receive the measured current signal, perform data analysis and linear fitting, calculate the coefficient of determination, standard error and correlation coefficient, and thus evaluate the response linearity of the photodiode.