Photoelectric sensor photosensitive area estimation algorithm

Abstract

The invention discloses a photosensitive area estimation algorithm for a photoelectric sensor. The photosensitive area estimation algorithm comprises the following steps: step 1, determining photoelectric conversion efficiency; 2, determining a filling factor; step 3, determining a precision requirement; 4, estimating the projection area of the light-sensitive surface; step 5, acquiring the actual area of the photosensitive surface; in the step 2, output voltage and current of the photoelectric conversion material under different loads are measured, a volt-ampere characteristic curve is drawn, the maximum output power is determined according to the volt-ampere characteristic curve, open-circuit voltage and short-circuit current are obtained through experimental measurement, the values are substituted into a fill factor calculation formula, and the value of a fill factor is calculated. The projection area of the photosensitive surface is calculated based on the photoelectric conversion efficiency, the fill factor, the angle detection precision requirement, the current density, the light intensity and the open-circuit voltage, the actual areas of different angle planes are obtained based on the projection area, and data support is provided for performance and structure optimization of the photoelectric sensor.

Description

Technical Field

[0001] The present invention relates to the field of sensor technology, and in particular to an algorithm for estimating the light-sensitive area of ​​a photoelectric sensor. Background Art

[0002] A photoelectric sensor is a sensor that uses the photoelectric effect to convert light signals into electrical signals. It can be used to detect light intensity. Some photoelectric sensors are designed with complex photosensitive surfaces. Different electrical signal parameters are obtained based on the differences in light response at different positions. These different electrical signal parameters are analyzed to establish a relationship model between the incident angle of light and the electrical signal. This model can be used to infer the incident angle of light based on the detected electrical signal. When designing this type of sensor, the actual photosensitive area and the projected photosensitive area need to be considered in order to design the size and layout of the photosensitive surface. In the prior art, there is no report on the photosensitive area estimation method of a photoelectric sensor. Therefore, an algorithm for estimating the photosensitive area of ​​a photoelectric sensor is proposed. Summary of the invention

[0003] The purpose of the present invention is to provide a photoelectric sensor light-sensitive area estimation algorithm to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solution: an algorithm for estimating the photosensitive area of ​​a photoelectric sensor, comprising the following steps: step 1, determining the photoelectric conversion efficiency; step 2, determining the fill factor; step 3, determining the accuracy requirement; step 4, estimating the projected area of ​​the photosensitive surface; step 5, obtaining the actual area of ​​the photosensitive surface;

[0005] In the above step 1, the photoelectric conversion efficiency η of the photoelectric conversion material used in the photoelectric sensor is determined by experiment;

[0006] In the above step 2, the filling factor FF of the photoelectric conversion material used in the photoelectric sensor is determined by experiment;

[0007] In the above step 3, the accuracy requirement of the photoelectric sensor for measuring the light angle is determined;

[0008] In the above step 4, based on the photoelectric conversion efficiency η, fill factor FF and accuracy requirements obtained in the above step, the projection area S of the photosensitive surface is estimated. 投影 ;

[0009] In the above step 5, based on the estimated photosensitive surface projection area S 投影 , determine the actual area S of the photosensitive surface 实际 .

[0010] Preferably, in step 1, the calculation formula for photoelectric conversion efficiency is:

[0011]

[0012] Input light energy = I 光 ×A

[0013] Output power = I × V

[0014] Then we have:

[0015]

[0016] Among them, I 光 is the light intensity, A is the irradiated area, and I is the light intensity I 光 The current value measured under the condition of light intensity I 光 The voltage value measured below.

[0017] Preferably, in step 2, specifically, the output voltage and current of the photoelectric conversion material under different loads are measured, a volt-ampere characteristic curve is drawn, the maximum output power is determined according to the volt-ampere characteristic curve, the open circuit voltage and short circuit current are obtained by experimental measurement, these values ​​are substituted into the calculation formula of the fill factor, and the value of the fill factor is calculated.

[0018] Preferably, the maximum output power is the power value corresponding to the point with the largest rectangular area in the volt-ampere characteristic curve.

[0019] Preferably, in step 2, the calculation formula of the filling factor is as follows:

[0020]

[0021] Among them, P m is the maximum output power of the photoelectric conversion material, V oc is the open circuit voltage, I sc is the short circuit current.

[0022] Preferably, in step three, the accuracy requirement for the photoelectric sensor to measure the light angle is 1°.

[0023] Preferably, in step 4, the projection area S of the photosensitive surface is estimated 投影 The specific method is as follows:

[0024] because:

[0025] P max =I 光 ×S 投影 ×η

[0026]

[0027] so:

[0028]

[0029] Among them, J sc is the measured value of current density.

[0030] Preferably, in step 5, the actual area S of the photosensitive surface is determined 实际 The specific method is as follows:

[0031] For the horizontal plane, the formula is as follows:

[0032]

[0033] For an inclined plane, the following formula is used when the incidence is on the right side:

[0034]

[0035] For an inclined plane, the following formula is used when incident on the left side:

[0036]

[0037] Here, θ is the angle between the light and the horizontal plane.

[0038] Compared with the prior art, the beneficial effects of the present invention are: the present invention calculates the projection area of ​​the photosensitive surface based on the photoelectric conversion efficiency, fill factor, angle detection accuracy requirements, current density, light intensity and open circuit voltage, and obtains the actual area of ​​planes at different angles based on the projection area, providing data support for the performance and structural optimization of photoelectric sensors. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 The present invention is a flow chart of the method. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] Please refer to the attached Figure 1 , an embodiment of the present invention: a photoelectric sensor photosensitive area estimation algorithm, comprising the following steps: step 1, determining the photoelectric conversion efficiency; step 2, determining the fill factor; step 3, determining the accuracy requirement; step 4, estimating the projected area of ​​the photosensitive surface; step 5, obtaining the actual area of ​​the photosensitive surface;

[0042] In the above step 1, the photoelectric conversion efficiency η of the photoelectric conversion material used in the photoelectric sensor is determined by experiment; the photoelectric conversion efficiency η is taken as 24%, and the calculation formula of the photoelectric conversion efficiency is:

[0043]

[0044] Input light energy = I 光 ×A

[0045] Output power = I × V

[0046] Then we have:

[0047]

[0048] Among them, I 光 is the light intensity, where I 光 Take 1mW / mm 2 , A is the irradiated area, I is the light intensity 光 The current value measured under the condition of light intensity I 光 The voltage value measured under

[0049] In the above step 2, the filling factor FF of the photoelectric conversion material used in the photoelectric sensor is determined by experiment, and the filling factor FF is taken as 0.82 here; specifically, the output voltage and current of the photoelectric conversion material under different loads are measured, and the volt-ampere characteristic curve is drawn. The maximum output power is determined according to the volt-ampere characteristic curve, and the open circuit voltage and short circuit current are obtained by experimental measurement. These values ​​are substituted into the calculation formula of the filling factor to calculate the value of the filling factor. The maximum output power is the power value corresponding to the point with the largest rectangular area in the volt-ampere characteristic curve; the calculation formula of the filling factor is as follows:

[0050]

[0051] Among them, P m is the maximum output power of the photoelectric conversion material, V oc is the open circuit voltage, where V oc Take 600mV, I sc is the short-circuit current, where I sc Take 30mA / cm 2 ;

[0052] In the above step 3, it is determined that the accuracy requirement of the photoelectric sensor for measuring the light angle is 1°;

[0053] In the above step 4, based on the photoelectric conversion efficiency η, fill factor FF and accuracy requirements obtained in the above step, the projection area S of the photosensitive surface is estimated. 投影 ; Among them, the estimated projection area S of the photosensitive surface 投影 The specific method is as follows:

[0054] because:

[0055] P max =I 光 ×S 投影 ×η

[0056]

[0057] so:

[0058]

[0059] Among them, J sc is the measured value of current density, where J sc Take 0.01μA;

[0060] Then we have:

[0061]

[0062] Therefore, S 投影 The value should reach 1mm 2 ;

[0063] In the above step 5, based on the estimated photosensitive surface projection area S 投影 , determine the actual area S of the photosensitive surface 实际 ; The specific method is as follows:

[0064] For the horizontal plane, the formula is as follows:

[0065]

[0066] For an inclined plane, the following formula is used when the incidence is on the right side:

[0067]

[0068] For an inclined plane, the following formula is used when incident on the left side:

[0069]

[0070] Here, θ is the angle between the light and the horizontal plane.

[0071] Based on the above, the advantage of the present invention is that when the invention is used, the projection area of ​​the photosensitive surface is calculated based on the photoelectric conversion efficiency, fill factor, angle detection accuracy requirements, current density, light intensity and open circuit voltage, and the actual area of ​​the plane at different angles is obtained based on the projection area, so as to assist in determining the size and layout of the photosensitive surface, which is beneficial to optimize the performance, size and layout of the sensor, improve the accuracy of angle measurement, and achieve a more reasonable sensor structure design.

[0072] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. An algorithm for estimating the photosensitive area of ​​a photoelectric sensor, comprising the following steps: Step 1, determine the photoelectric conversion efficiency; Step 2, determine the fill factor; Step 3, determine the accuracy requirement; Step 4, estimate the projected area of ​​the photosensitive surface; Step 5, obtain the actual area of ​​the photosensitive surface; It is characterized by: In the above step 1, the photoelectric conversion efficiency η of the photoelectric conversion material used in the photoelectric sensor is determined by experiment; In the above step 2, the filling factor FF of the photoelectric conversion material used in the photoelectric sensor is determined by experiment; In the above step 3, the accuracy requirement of the photoelectric sensor for measuring the light angle is determined; In the above step 4, based on the photoelectric conversion efficiency η, fill factor FF and accuracy requirements obtained in the above step, the projection area S of the photosensitive surface is estimated. 投影 ; In the above step 5, based on the estimated photosensitive surface projection area S 投影 , determine the actual area S of the photosensitive surface 实际 .

2. The photoelectric sensor light-sensitive area estimation algorithm according to claim 1, characterized in that: In the step 1, the calculation formula of the photoelectric conversion efficiency is: Input light energy = I 光 ×A Output power = I × V Then we have: Among them, I 光 is the light intensity, A is the irradiated area, and I is the light intensity I 光 The current value measured under the condition of light intensity I 光 The voltage value measured below.

3. The photoelectric sensor light-sensitive area estimation algorithm according to claim 1, characterized in that: In the step 2, specifically: measure the output voltage and current of the photoelectric conversion material under different loads, draw a volt-ampere characteristic curve, determine the maximum output power based on the volt-ampere characteristic curve, experimentally measure the open circuit voltage and short circuit current, substitute these values ​​into the calculation formula of the fill factor, and calculate the value of the fill factor.

4. The photoelectric sensor light-sensitive area estimation algorithm according to claim 3, characterized in that: The maximum output power is the power value corresponding to the point with the largest rectangular area in the volt-ampere characteristic curve.

5. The photoelectric sensor light-sensitive area estimation algorithm according to claim 1, characterized in that: In step 2, the calculation formula of the fill factor is as follows: Among them, P m is the maximum output power of the photoelectric conversion material, V oc is the open circuit voltage, I sc is the short circuit current.

6. The photoelectric sensor light-sensitive area estimation algorithm according to claim 1, characterized in that: In step three, the accuracy requirement for the photoelectric sensor to measure the light angle is 1°.

7. The photoelectric sensor light-sensitive area estimation algorithm according to claim 1, characterized in that: In step 4, the projection area S of the photosensitive surface is estimated 投影 The specific method is as follows: because: P max =I 光 ×S 投影 ×η so: Among them, J sc is the measured value of current density.

8. The photoelectric sensor light-sensitive area estimation algorithm according to claim 1, characterized in that: In step 5, the actual area S of the photosensitive surface is determined. 实际 The specific method is as follows: For the horizontal plane, the formula is as follows: For an inclined plane, the following formula is used when the incidence is on the right side: For an inclined plane, the following formula is used when incident on the left side: Here, θ is the angle between the light and the horizontal plane.

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