TW201537150A - Apparatus and method for inspecting light source - Google Patents

Abstract

An apparatus and a method for inspecting a light source are provided, the apparatus comprising a first photo-sensor module, a second photo-sensor module, a movement module, and a processor module. The first photo-sensor module receives light at a first location from the light source during a first time interval to generate a first base signal, and during a second time interval to generate a first measurement signal. The second photo-sensor module, disposed at the movement module, receives light at a second location from the light source during the second time interval to generate a second measurement signal. The movement module makes the second photo-sensor module move relatively to the first photo-sensor module. The processor module, coupled with and driving the movement module, calculates a first terminal value corresponding to the second location based on the aforementioned signals. The apparatus may further comprise a measurement module that receives the aforementioned signals to generate measurement values.

Description

Light source detecting device and method

The present disclosure relates to light source detection, and in particular to a low error detection apparatus and method with compensation factors for spatial uniformity and temporal stability of a light source.

Air mass (AM) is a concept used to quantify the surface's "irradiance" (in watts per square meter [W/m ² ]). When the sun is incident vertically above the surface direction, assuming that the thickness of the atmosphere penetrated by the light is 1, the illumination condition of the surface is recorded as AM1, and the irradiance energy of the sunlight is about 1366 W/m ² . Since the Earth's population is concentrated in temperate or subtropical latitudes, the actual incident angle of sunlight is irradiated to the ground at an oblique angle. The international standard defines the average illumination condition of these areas as AM1.5G, which represents the angle between the sun and the vertical line of the ground. It is about 48 degrees obliquely incident, that is, the light penetrates into the atmosphere of 1.5 times the thickness, where G(global) means that the scattering factor of light is considered; when AM1.5G, the irradiance energy of sunlight is about 963.75W/ m ² . For the convenience of measurement calculation, AM1.5G is usually counted as 1000W/m ² .

When measuring the power generation efficiency of a solar cell or a photovoltaic cell, it is usually necessary to use a solar simulator in the laboratory. The standard solar condition of AM1.5G is now used as a standard light source for man-made. The solar simulator is subject to losses or defects in the bulb, lens, and mirror, and varies or varies with time of use and requires periodic calibration or repair. In order to ensure the performance of the solar simulator, the international standard IEC 60904-9 for solar simulator performance testing, it is recommended to consider: spectral match (spectral match), irradiance unevenness (spatial uniformity) of the light source illumination plane and light source The magnitude of the change over time (time stability), the performance of the three levels of A, B, C for the solar simulator. Among them, spatial uniformity is recommended to divide the illumination plane of the light source into at least 64 equal-area zones, and measure the data of each partition. However, the number of practical upper areas may be as high as hundreds. In the current laboratory, it is still time-consuming to measure the realistic spatial uniformity of the solar simulator with manual and a small number of expensive sensors, and more serious is the light source. When used for a long time, the instability of the light source will cause the data to fluctuate and be distorted during the measurement before and after the measurement.

In view of the above problems, the present disclosure is directed to providing a light source detecting apparatus and method for automatically measuring the spatial uniformity and time stability of a light source, in particular, when measuring the former, through instantaneous compensation to eliminate the negative influence of the light source over time. .

The light source detecting device provided by the present disclosure comprises: a first photosensitive module, a second photosensitive module, a moving module and a processing module. The first photosensitive module receives the light generated by the light source at the first position in the first time period to generate a first reference signal, and receives the light generated by the light source at the first position in the second time period to generate the first measurement signal. The second photosensitive module is disposed on the mobile module, and is configured to receive light generated by the light source at the second position during the second time period to generate a second measurement signal. The mobile module is used to make the second photosensitive module One-dimensional or two-dimensional movement is performed with respect to the first photosensitive module. The processing module is coupled to the mobile module, and configured to calculate a first final value corresponding to the second location according to the first reference signal, the first measurement signal, and the second measurement signal. In one embodiment, the light source detecting device of the present disclosure further includes a measuring module coupled to the first sensing module, the second sensing module, and the processing module for receiving the signal to generate a corresponding Reference value or measurement value.

The light source detecting method provided by the present disclosure includes: receiving light generated by a light source at a first position in a first time period and a second time period to respectively generate a first reference signal and a first measurement signal; and selectively in the second time period The second position receives the light generated by the light source to generate the second measurement signal; and calculates the correction compensation value corresponding to the second position as the first final value according to the first reference signal, the first measurement signal, and the second measurement signal. In an embodiment, the light source detecting method provided by the present disclosure further includes generating a corresponding reference value or a measured value according to the foregoing signal, and the first final value is equal to the second measured value multiplied by the first reference value divided by the first amount. Measured value.

In summary, the relationship between the first measurement signal and the first reference signal measured by the light source detecting device and the method in different time periods is a compensation factor, and the second measurement value is corrected by the factor. Since the first and second measurement signals are acquired at the same time, the compensation correction of the present disclosure is immediacy. In terms of device design, the present disclosure requires only two photosensitive modules and can automatically control the position of the second photosensitive module, which helps to significantly reduce manufacturing costs and time required for detection. In other embodiments, the light source detecting device provided by the present disclosure may further include one or more third photosensitive modules for parallel measurement, and another compensation factor between the second and third photosensitive modules may be used to correct the measured values.

The above description of the disclosure and the following embodiments are intended to illustrate and explain the spirit and principles of the disclosure, and to provide further explanation of the scope of the disclosure.

1‧‧‧Light source detection device

11‧‧‧First sensor module

12‧‧‧Second sensor module

13‧‧‧ third sensor module

14‧‧‧Mobile Module

141‧‧‧First track

142‧‧‧second track

143‧‧‧ stage

15‧‧‧Measurement module

16‧‧‧Processing module

41‧‧‧Lighting range

42‧‧‧effective range

1 is a high-order block diagram of a light source detecting device according to an embodiment of the present disclosure.

FIG. 2 is a schematic diagram showing the configuration of a first photosensitive module, a second photosensitive module, and a moving module according to an embodiment of the present disclosure.

Figure 3 is a perspective view of a mobile module in accordance with an embodiment of the present disclosure.

4 is a schematic diagram showing the configuration of a first photosensitive module, a second photosensitive module, a plurality of third photosensitive modules, and a moving module according to an embodiment of the present disclosure.

FIG. 5 is a schematic diagram of a first measurement signal, a second measurement signal, and an effective measurement period according to an embodiment of the present disclosure.

Figure 6 is a flow chart of a light source detecting method according to an embodiment of the present disclosure.

The detailed features and advantages of the present disclosure are described in detail in the following detailed description of the embodiments of the disclosure, and the disclosure of The objects and advantages associated with the present disclosure can be readily understood by those skilled in the art. The following examples are intended to further illustrate the present disclosure, but are not intended to limit the scope of the disclosure.

Please also refer to Figure 1 and Figure 2. Figure 1 is based on the disclosure A high level block diagram of a light source detecting device of an embodiment. As shown in FIG. 1 , the light source detecting device 1 includes: a first photosensitive module 11 , a second photosensitive module 12 , a moving module 14 (described in detail in FIG. 3 ), a measuring module 15 and a processing module. 16. The first photosensitive module and the second photosensitive module may be any photoelectric conversion element, such as a photodiode, a solar cell or a photovoltaic cell, or a charge-coupled device (CCD). The specifications of the first photosensitive module and the second photosensitive module are not necessarily the same, and the same photoelectric conversion principle is not required; since the first photosensitive module is a reference property, a relatively inexpensive component can be selected in practice. The measurement module 15 can include an analog/digital converter, a digital multimeter, or a data acquisition hardware. The processing module 16 has functions such as computing, storing, and controlling the mobile module 14, and can be implemented by one computer. 2 is a schematic view showing the arrangement of the first photosensitive module 11, the second photosensitive module 12, and the moving module 14. The object to which the light source detecting device 1 is applied includes, but is not limited to, a planar light source. Taking the detection planar light source as an example, the light source detecting device 1 is placed in the illumination range 41 of the light source. The effective range 42 is opposite to the illumination range 41, which refers to the planar area of the source that is actually used when the source is used to evaluate the solar cell.

The fixed first photosensitive module 11 first generates a first reference signal according to the received light at the first position in the first time period. The processing module 16 then drives the mobile module 14 to move the second sensing element 12 to the second position. The second position is in the effective range 42 of the light source detecting device 1. Since the light source in the effective range 42 is the detection focus of the present disclosure, the second position must fall therein, but the first position is only The illumination range is within 41. The second sensing module 12 generates a second measurement signal according to the received light in the second position in the second time period; meanwhile, the first sensing module 11 also generates the first measurement signal in the first position. The second sensing module 12 can also receive signals during the first time period. The function of this signal is not within the scope of this disclosure, but for example, it can provide a more reliable reference value with the first reference signal. The first reference signal, the first measurement signal and the second measurement signal are received by the measurement module 15, and respectively generate a first reference value, a first measurement value and a second measurement value. The nature of these signals depends on the principle of photoelectric conversion used by the sensor module that generates the signal; for example, the signal can be photocurrent, and the reference or measurement is expressed in milliamps (mA); or illumination (illumination intensity), the reference value or measurement value is expressed in lux; or the physical quantity of the unit of measure of the International System of Units. The disclosure does not limit the manner in which the measurement module 15 generates the reference value or the measured value; for example, if the first reference signal is regarded as a domain with a time series of the first time period, then The first reference value can be the average or median of the time series.

Finally, the processing module 16 calculates the compensated corrected measured value at the second position, that is, the first final value, based on the values. In an embodiment, the compensation factor is a ratio of the first reference value to the first measurement value, and the first final value is equal to the second measurement value multiplied by the compensation factor. The overall irradiance of a planar light source may increase by 2% to 5% in half a small time, and the significance of this algorithm is to reverse the change of the light source with time. According to the previous measurement, by taking two values (the first reference value and the first measurement value) at the same position, the variation range of the overall irradiance during this time is known, and accordingly Correct the data at other locations (second measurement).

See Figure 3. Figure 3 is a perspective view of the mobile module 14 in accordance with an embodiment. As shown in FIG. 3, the mobile module 14 includes a first track 141, a second track 142, and a stage 143. The stage 143 is configured to carry the second photosensitive module 12 and is slidable along a first dimension of a plane on the first track 141. The first track 141 is slidable along a second dimension of the same plane on the second track. The mobile module 14 may include a motor (not labeled) controlled by the processing module 16 for pulling the stage 143 and the first track 141. The mobile module 14 can also be replaced by a robotic arm with a suitable gripping device.

The stage 143 in Figure 3 can be easily extended or duplicated to carry more photosensitive modules. As shown in FIG. 4, in this embodiment, the second photosensitive module 12 and the four third photosensitive modules 13 are distributed on the first track 141 of the mobile module 14, covering the width of the effective range 42. Please note that the second photosensitive module 12 and the third photosensitive module 13 are substantially different, and are distinguished here for convenience of description; therefore, for a third photosensitive module 13, the third measuring signal is at a third position. The process of generating and converting the measurement module 15 to the third measurement value and calculating the second final value corresponding to the third position by the final processing module 16 should be similar to the second photosensitive module 12. The disclosure also does not limit the number of photosensitive modules, and how they are arranged and distributed on the first track 141, and those of ordinary skill in the art can freely design. As shown in FIG. 4, the second photosensitive module 12 and the third photosensitive module 13 do not need to be measured along the second dimension in the first dimension, which simplifies the design of the mobile module 14. More importantly, the time required to detect the planar light source as a whole is further shortened.

When the light source detecting device 1 has a plurality of active photosensitive modules, another layer of compensation correction may be needed to eliminate the inherent difference between the individuals; the so-called inherent difference is that the results of different photosensitive module measurements under the same conditions exist. The difference. In an embodiment, the second photosensitive module 12 is selected as a reference component. Following the algorithm of the compensation factor in the first final value, assuming that the data from the second photosensitive module 12 and the third photosensitive module 13 have a fixed ratio, the second photosensitive can be made under a standard illumination condition (such as AM1.5G). The module 12 and the third sensing module 13 respectively generate a second reference signal and a third reference signal, and then convert the two signals into a second reference value and a third reference value, respectively. In one embodiment, a compensation factor for eliminating individual differences between the photosensitive modules, that is, a ratio of the second reference value to the third reference value, and the second final value is equal to the third measurement value multiplied by the compensation factor And multiplying the aforementioned compensation factor according to the first photosensitive module 11.

The light source detecting device 1 can be used for a steady-state illumination source that continuously emits light, and can also be used for a pulse-illuminated illumination source. When applied to the latter, since the length of the primary pulse wave (which can be regarded as the aforementioned second time period) is only between 10 and 100 milliseconds (ms), the measurement module 15 does not need to receive the second measurement signal at any time and generate the second amount. Measured value. See Figure 5. FIG. 5 is a schematic diagram of a first measurement signal and a second measurement signal according to an embodiment of the disclosure. As shown in FIG. 5, the measurement module 15 can be triggered to receive the second measurement signal when the first measurement signal exceeds a certain preset value. Since the noise is usually present in the foremost and last segments of the pulse wave, the measurement module 15 can wait for a delay to enter the effective measurement period, and the effective measurement period is a part of the second period. As described above, the measurement module 15 can take the second measurement signal (as a time series) The average or median in the effective measurement period to produce a second measurement.

Please refer to Figure 6 in conjunction with Figure 1. Figure 6 is a flow chart of a light source detecting method according to an embodiment of the present disclosure. As shown in the figure, in step S61, the first photosensitive module 11 receives the light generated by the light source at the first position to generate the first reference signal, and the measurement module 15 generates the first signal according to the first reference signal. Reference value. In step S63, the first photosensitive module 11 generates a first measurement signal at the first position in the second time period, and the measurement module 15 generates a first measurement value according to the first measurement signal; the second photosensitive module 12 is moved by the mobile module 14 to the second position to generate a second measurement signal. In step S65, the processing module 16 determines whether the first measured value is greater than a preset value; if yes, proceeds to step S67, and if not, returns to step S63 to continue waiting for the triggering of the first photosensitive module 11. In step S67, the measurement module 15 generates a second measurement value according to the second measurement signal of the effective measurement period, and the effective measurement period is a part of the second time period. In step S69, the processing module 16 calculates a first final value corresponding to the second location according to the first reference value, the first measured value, and the second measured value. In an embodiment, the first final value is equal to the second measured value multiplied by the first reference value divided by the first measured value.

In an embodiment, the mobile module 14 moves the second photosensitive module 12 to the fourth position over the third period, and the steps S63 to S69 are performed for the fourth position to generate the third final value, so as to repeat until the light source detecting device 1 Complete the measurement of the effective range 42. After obtaining the final values corresponding to the plurality of positions, the unevenness of the irradiance throughout the light source can be calculated according to the formula suggested by IEC 60904-9. At the same time, if the irradiance of the same position at different time periods is measured by the second photosensitive module 12 or the third photosensitive module 13, the change of the light source with time can also be estimated. For pulse hair The illumination source of the light, the second photosensitive module 12 or the third photosensitive module 13 is on the effective range 42, and the measurement module 15 can enter the effective measurement period when the first measurement signal exceeds a certain preset value. The second measurement signal or the third measurement signal, the effective measurement period (as a time series), as shown in Fig. 5, the time stability of each pulse light of the pulse illumination can be estimated (effective measurement period) The amount of change in light source intensity during the time).

In summary, the light source detecting device and method of the present disclosure can automatically measure the spatial uniformity and time stability of the light source, and in particular, the former can measure the former to eliminate the negative influence of the time instability of the light source. For a pulsed light source, the present disclosure provides a trigger mechanism that causes the measurement module 14 to receive a second measurement signal to generate a second measurement value when necessary, reducing the amount of data and the burden on the processing module 16. The disclosure may also use a plurality of photosensitive modules placed on the effective range 42 to increase the measurement rate and correct the final value by another cross-module compensation factor based on standard illumination conditions.

Although the disclosure is disclosed above in the foregoing embodiments, it is not intended to limit the disclosure. All changes and refinements are beyond the scope of this disclosure. Please refer to the attached patent application for the scope of protection defined by this disclosure.

1‧‧‧Light source detection device

11‧‧‧First sensor module

12‧‧‧Second sensor module

14‧‧‧Mobile Module

15‧‧‧Measurement module

16‧‧‧Processing module

Claims (16)

A light source detecting device includes: a first photosensitive module configured to receive light generated by a light source at a first position for generating a first reference signal for a second time period; Receiving light generated by the light source to generate a first measurement signal; and a second photosensitive module for receiving light generated by the light source at a second position during the second time period to generate a second measurement signal a mobile module for moving the second photosensitive module relative to the first photosensitive module, the second photosensitive module being disposed on the mobile module, and a processing module coupled to the mobile module The driving module is configured to calculate a first final value corresponding to the second position according to the first reference signal, the first measurement signal, and the second measurement signal. The light source detecting device of claim 1, further comprising a measuring module coupled to the first photosensitive module, the second photosensitive module and the processing module for receiving the first reference signal to generate a first reference value for receiving the first measurement signal to generate a first measurement value, and for receiving the second measurement signal to generate a second measurement value. The light source detecting device of claim 2, wherein the first final value is the second measured value multiplied by the first reference value divided by the first measured value. The light source detecting device of claim 3, wherein when the first measured value is greater than a predetermined value, the measuring module receives the second measuring signal to generate the first Two measurements. The light source detecting device of claim 4, wherein the measuring module receives the second measuring signal to generate the second measured value according to the second measuring signal of an effective measuring period to generate the first The second measurement value includes the effective measurement period. The light source detecting device of claim 2, further comprising: at least one third photosensitive module, disposed in the mobile module, coupled to the measuring module, for receiving in a third position during the second time period The light generated by the light source generates a third measurement signal; wherein the movement module is further configured to move the third photosensitive module relative to the first photosensitive module, and the measurement module is further configured to receive the third Measuring the signal to generate a third measurement value, the processing module is further configured to calculate the corresponding third position according to the first reference value, the first measurement value, the third measurement value, and a compensation factor a second final value associated with the second photosensitive module and the third photosensitive module. The light source detecting device of claim 6, wherein the second photosensitive module generates a second reference signal under a standard illumination condition, and the second reference signal corresponds to a second reference value, the third photosensitive module Generating a third reference signal, the third reference signal corresponding to a third reference value, the compensation factor is the second reference value divided by the third reference value, the second final value is the third measured value multiplied by The compensation factor is multiplied by the first reference value divided by the first measured value. The light source detecting device of claim 1, wherein the second sensing module is further configured to receive light generated by the light source at a fourth position for generating a fourth measuring signal in a third time period, the processing module The method further calculates a third final value corresponding to the fourth position according to the first reference signal, the first measurement signal, and the fourth measurement signal. The light source detecting device of claim 1, wherein the first photosensitive module or the second photosensitive module is a photodiode, a solar cell or a charge coupled device. A method for detecting a light source, comprising: receiving light generated by a light source at a first position for generating a first reference signal during a first time period; receiving light generated by the light source at the first position for a second time period to generate a light source a first measurement signal; receiving, at a second position, the light generated by the light source to generate a second measurement signal; and, according to the first reference signal, the first measurement signal, and the second quantity The test signal calculates a first final value corresponding to the second position. The method of detecting a light source according to claim 10, further comprising: generating a first reference value according to the first reference signal; generating a first measurement value according to the first measurement signal; and selectively The second measurement signal generates a second measurement value; wherein the first final value is the second measurement value multiplied by the first reference value divided by the first measurement value. The method of detecting a light source according to claim 11, wherein the step of selectively generating the second measurement value according to the second measurement signal comprises: determining whether the first measurement value is greater than a preset value; and when When the first measurement value is greater than the preset value, the second measurement value is generated according to the second measurement signal. The method of detecting a light source according to claim 12, wherein the step of generating the second measurement value according to the second measurement signal generates the second measurement value according to the second measurement signal of an effective measurement period, The second time period includes the effective measurement period. The method of detecting a light source according to claim 11, further comprising: receiving light generated by the light source at a third position during the second time period to generate a third measurement signal; generating a first according to the third measurement signal And measuring a second final value corresponding to the third position according to the first reference value, the first measured value, the third measured value, and a compensation factor. The light source detecting method of claim 14, further comprising: generating a second reference signal under a standard illumination condition, the second reference signal corresponding to a second reference value; and generating a a third reference signal, the third reference signal corresponding to a third reference value; wherein the compensation factor is the second reference value divided by the third reference value, the second final value is the third measured value multiplied by the The compensation factor is multiplied by the first reference value divided by the first measured value. The light source detecting method of claim 10, further comprising: receiving light generated by the light source at a fourth position during a third time period to generate a fourth measurement signal; and according to the first reference signal, the first The measurement signal and the fourth measurement signal calculate a third final value corresponding to the fourth position.