CN111207827B - Debugging method of light intensity calculation model and visible light intensity illuminance value measuring system - Google Patents
Debugging method of light intensity calculation model and visible light intensity illuminance value measuring system Download PDFInfo
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- G—PHYSICS
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Abstract
The invention provides a debugging method of a light intensity calculation model, which comprises the steps of providing an optical debugging device, obtaining a maximum channel ratio, carrying out an adjusting step, carrying out a measuring step, carrying out a recording step and carrying out a calculating step. The optical debugging device comprises an optical sensing device and an LED fixing table. The adjusting step is to select a plurality of channel ratios. The measuring step is to measure the ambient light channel value and the infrared light channel value of each channel ratio. The recording step is to record a light intensity illumination value of each channel ratio and the maximum channel ratio. The calculation step is to obtain a first parameter value and a second parameter value to obtain a light intensity calculation model. Therefore, the invention utilizes the debugged light intensity calculation model to measure the visible light intensity illumination value.
Description
Technical Field
The present invention relates to a method for debugging a light intensity calculation model and a system for measuring a visible light intensity illuminance value, and more particularly, to a method for debugging a light intensity calculation model using an ambient light sensor and an infrared light sensor at the same time and a system for measuring a visible light intensity illuminance value.
Background
In recent years, the development of the internet of things is rapid, and many IoT devices need to accurately sense the change of visible light in the external environment, wherein a digital ambient light sensor is small in volume and low in power consumption, and is very suitable for IoT devices, but a silicon photosensor in the light sensor also has response to infrared light that cannot be sensed by human eyes, so that when the infrared light in ambient light has a large ratio, the measurement result has a large deviation.
In view of the above situation, the light intensity measuring devices in the market are basically realized by optical coating, and mainly add a suitable V (λ) correction filter right above the ambient light sensor to compensate the spectral response, and the design and debugging of the filter require a lot of time and cost. In addition, or an optical sensor with a correction filter film of V (lambda) can be selected, which is suitable for measurement by direct exposure to air, but is not suitable when the transmittance of the window glass on the shell is not uniform in visible light and infrared light, for example, for product beauty, the shell uses dark glass to prevent the exposure of the chip inside.
In view of this, how to modify the spectral response of the digital ambient light sensor to reduce the interference of infrared light and reduce the difference between the measurement result and the actual perception of human eyes is the goal of the related manufacturers.
Disclosure of Invention
The invention aims to provide a debugging method of a light intensity calculation model, which can adjust the voltage and current of a visible light LED and an infrared light LED through a specific debugging device to simulate ambient light so as to debug the light intensity calculation model.
Another objective of the present invention is to provide a system for measuring the visible light intensity illuminance, which determines the final light intensity calculation model by using different ratios of the infrared light sensor and the ambient light sensor to calculate the visible light intensity illuminance.
An embodiment of the present invention provides a method for debugging a light intensity calculation model, which includes providing an optical debugging apparatus, obtaining a maximum channel ratio, performing an adjusting step, performing a measuring step, performing a recording step, and performing a calculating step. The optical debugging device comprises an optical sensing device, an LED fixed station and a black light shield, wherein the optical sensing device comprises an ambient light sensor and an infrared light sensor, the ambient light sensor is used for outputting an ambient light channel value, and the infrared light sensor is used for outputting an infrared light channel value. The LED fixing table comprises a visible light LED light source and an infrared light LED light source, and the LED fixing table is arranged above the light sensing device. The black mask is used for covering the optical debugging device. The maximum channel ratio is obtained by turning on the infrared LED light source, and the ratio of the measured infrared light channel value to the ambient light channel value is the maximum channel ratio. The adjusting step is to adjust the voltage and current of the visible light LED light source and the infrared light LED light source to select a plurality of channel ratios, and each channel ratio is the maximum channel ratio multiplied by a proportional constant. The measuring step is to measure the ambient light channel value and the infrared light channel value corresponding to the channel ratio respectively. The recording step is to replace the light sensing device with a standard illuminometer to record a light intensity illuminance value corresponding to the channel ratio and the maximum channel ratio. The calculation step is to substitute the ambient light channel value, the infrared light channel value and the light intensity illumination value corresponding to each channel ratio and the maximum channel ratio into a light intensity operation equation to obtain a plurality of first parameter values and a plurality of second parameter values, and obtain a plurality of light intensity calculation models according to the first parameter values and the second parameter values.
According to the light intensity calculation model debugging method described in the preceding paragraph, the optical debugging device may further include a caliper and a fixing screw, and the LED fixing stage is fixed to the caliper by the fixing screw.
According to the debugging method of the light intensity calculation model described in the previous paragraph, the distance between the LED fixing table and the light sensing device can be adjusted by the fixing screw.
The tuning method of the light intensity calculation model according to the preceding paragraph, wherein the number of the channel ratios may be nine.
The tuning method of the light intensity calculation model according to the preceding paragraph, wherein the proportionality constant can be smaller than 1.
According to the light intensity calculation model debugging method described in the previous paragraph, the proportionality constants of the channel ratios may be 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8 and 0.9 in sequence.
According to the debugging method of the light intensity calculation model described in the previous paragraph, the light intensity calculation equation can be an equation shown in formula (I):
lux ═ mx (CH 0-kxch 1) formula (I);
where Lux is the illumination value of each light intensity, CH0 is the channel value of each ambient light, CH1 is the channel value of each infrared light, m is the first parameter value, and k is the second parameter value.
The method for debugging a light intensity calculation model according to the preceding paragraph may further include selecting a channel ratio of two adjacent sets of proportionality constants and an ambient light channel value, an infrared light channel value, and a light intensity illumination value corresponding to the maximum channel ratio to be substituted into the light intensity calculation equation to obtain a first parameter value and a second parameter value, wherein a first parameter value and a second parameter value may be correspondingly substituted into the light intensity calculation equation to obtain a light intensity calculation model for a channel ratio interval of two adjacent sets of proportionality constants.
Another embodiment of the present invention provides a visible light intensity illuminance measurement system, which includes a non-transitory machine readable medium storing a program for measuring a visible light intensity illuminance value in an environment when the program is executed by a processing unit, and the program includes a digital ambient light sensor module, a digital infrared light sensor module, and an arithmetic processing module. The digital ambient light sensor module collects visible light and infrared light in the environment and processes the visible light and the infrared light into an ambient light digital signal, and the digital infrared light sensor module collects infrared light in the environment and processes the infrared light into an infrared light digital signal. The operation processing module is used for operating the environment light digital signal and the infrared light digital signal to calculate the visible light intensity illumination value, wherein the operation processing module is established by the following steps of calculating an operation ratio, providing the debugging method of the light intensity calculation model, performing a selection step and performing a visible light intensity illumination value calculation step. The calculation ratio calculation step is to calculate the ratio between the infrared light digital signal and the ambient light digital signal as a calculation ratio. The selection step is to compare the operation ratio with the channel ratio and the maximum channel ratio and select the corresponding light intensity calculation model. The visible light intensity illumination value calculating step is to substitute the environment light digital signal and the infrared light digital signal into the light intensity calculating model to obtain the visible light intensity illumination value.
According to the system for measuring the illuminance value of visible light described in the previous paragraph, when the operation ratio is greater than the maximum channel ratio, the illuminance value of visible light is 0.
Therefore, the debugging method of the light intensity calculation model is convenient and rapid to debug the light intensity calculation model through the specific debugging device, can compensate the interference caused by the infrared light part in the environment light, and then determines the finally debugged light intensity calculation model according to different proportions measured by the infrared light sensor and the environment light sensor so as to accurately calculate the illumination value of the visible light intensity.
Drawings
In order to make the aforementioned and other objects, features, and advantages of the invention, as well as others which will become apparent, reference is made to the following description of the preferred embodiments of the invention in which:
FIG. 1 is a flow chart illustrating the steps of a method for debugging a light intensity calculation model according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating an optical commissioning device according to the embodiment of FIG. 1;
FIG. 3 is a schematic diagram showing an architecture of a visible intensity illuminance value measurement system according to another embodiment of the present invention; and
fig. 4 is a flow chart illustrating an arithmetic processing module according to the embodiment of fig. 3.
Description of reference numerals:
debugging method of light intensity calculation model
110. 120, 130, 140, 150, 160
200
Light sensing device
LED fixed station
221
An infrared LED light source
A caliper
240
250
300. visible light intensity illuminance value measuring system
A non-transitory machine readable medium
A digital ambient light sensor module
Digital infrared light sensor module
430
431. 432, 433, 434
Detailed Description
Embodiments of the present invention will be described below with reference to the accompanying drawings. For the purposes of clarity, numerous implementation details are set forth in the following description. However, the reader should understand that these implementation details should not be used to limit the invention. That is, in some embodiments of the invention, such implementation details are not necessary. In addition, some conventional structures and elements are shown in simplified schematic form in the drawings for the sake of simplifying the drawings; and repeated elements will likely be referred to using the same reference numerals.
Referring to fig. 1 and fig. 2, fig. 1 is a flowchart illustrating a method 100 for debugging a light intensity calculation model according to an embodiment of the invention, and fig. 2 is a schematic diagram illustrating an optical debugging apparatus 200 according to the embodiment of fig. 1. In fig. 1, the method 100 for tuning the light intensity calculation model includes steps 110, 120, 130, 140, 150 and 160.
Step 110 is to provide an optical debugging device, wherein the optical debugging device 200 comprises a light sensing device 210 and an LED fixing stage 220. The light sensing device 210 includes an ambient light sensor (not shown) for outputting an ambient light channel value, and an infrared light sensor (not shown) for outputting an infrared light channel value, where the ambient light channel value is denoted by CH0 and the infrared light channel value is denoted by CH 1. The LED fixing stage 220 includes a visible LED light source 221 and an infrared LED light source 222, and the LED fixing stage 220 is disposed above the light sensing device 210.
In detail, the optical adjustment apparatus 200 may further include a caliper 230 and a fixing screw 240, and the LED fixing stage 220 is fixed on the caliper 230 by the fixing screw 240, and the distance between the LED fixing stage 220 and the light sensing apparatus 210 is adjustable by the fixing screw 240, so that the light intensity and the illumination of the light sensing apparatus 210 are moderate. In addition, the optical debugging device 200 may include a black mask 250 for shielding the optical debugging device 200 from other external light sources.
Step 120 is to obtain a maximum channel ratio by turning on the infrared LED light source 222, where the ratio between the measured infrared light channel value and the ambient light channel value is the maximum channel ratio. Thus, the infrared light channel value measured under infrared light is CH1 * The measured ambient light channel value is represented by CH0 * Expressed and the maximum channel ratio is given by r max Denotes, therefore, defines r max Is CH1 * /CH0 * 。
Step 130 is an adjustment step, which is to adjust the voltage and current of the visible light LED light source 221 and the infrared light LED light source 222 to select a plurality of channel ratios of infrared light and ambient light, each channel ratio being r n Denotes and defines r n Is CH1 n /CH0 n And each channel ratio is the maximum channel ratio multiplied by a proportionality constant. In detail, for simplifying the calculation, the number of the selected channel ratios can be, but not limited to, nine, so that n is an integer from 1 to 9, and the proportionality constant is required to be less than 1, so that the selected channel ratio r 1 To r 9 The proportionality constants of 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8 and 0.9 in sequence are the channel ratio r selected by the invention 1 To r 9 The sequence is 0.1r max 、0.2r max 、0.3r max 、0.4r max 、0.5r max 、0.6r max 、0.7r max 、0.8r max And 0.9r max 。
Step 140 is to perform a measurement step, which is to measure the ambient light channel value and the infrared light channel value corresponding to each channel ratio respectively. Step 150 is to perform a recording step, in which the light sensing device 210 is replaced by a standard illuminometer (not shown), so as to record a light intensity illuminance value corresponding to each channel ratio and the maximum channel ratio, and the light intensity illuminance value is expressed by Lux. In detail, since r is defined n Is CH1 n /CH0 n So can pass through r n Value given CH1 n And CH0 n The value of (c). By channel ratio r 1 For example, measure at r 1 Is 0.1r max Then, the obtained CH0 is represented by CH0 1 Denotes CH1 by CH1 1 Expressed as Lux recorded on a standard luminometer 1 And (4) showing. To summarize, r will be chosen n The values repeat steps 140 and 150 to obtain CH0 n 、CH1 n And Lux n And n is an integer of 1 to 9, and r max Proceeding to step 150, the illumination value Lux of the light intensity can be obtained * 。
Step 160 is a calculation step, which is to calculate the channel ratio of the two adjacent sets of proportionality constants and the ambient light channel value (CH 0) corresponding to the maximum channel ratio n 、CH0 * ) Infrared light channel value (CH 1) n 、CH1 * ) And light intensity illuminance value (Lux) n 、Lux * ) Substituting the first parameter value and the second parameter value into a light intensity operation equation to obtain a plurality of first parameter values and a plurality of second parameter values, and obtaining a light intensity calculation model according to the first parameter values and the second parameter values. In detail, 0.1r is used max And 0.2r max For example, the adjacent 0.1r max And 0.2r max Respectively corresponding CH0 1 、CH1 1 、Lux 1 And CH0 2 、CH1 2 、Lux 2 Substituting into the light intensity operational equation, wherein the light intensity operational equation is the equation shown in formula (I):
lux ═ mx (CH 0-kxch 1) formula (I);
solving a linear equation of two-dimentional system to obtain a first parameter value and a second parameter value, wherein the first parameter value is represented by m, the second parameter value is represented by k, and 0.1r max And 0.2r max The calculated m is m 1 K is k 1 . In actual measurement, the ratio of the measured infrared light channel value to the ambient light channel value is r, and since it is impossible to call out the light with r being 0, when r is<0.2r max When m and k are m 1 And k is 1 (ii) a Finally, m is put 1 And k 1 Correspondingly substituting into the light intensity operation equation to obtain r e (0,0.2 r) max ) A light intensity calculation model of the interval.
Repeat the above steps 160, 0.2r max And 0.3r max The calculated m is m 2 K is k 2 ，0.3r max And 0.4r max The calculated m is m 3 K is k 3 ，0.4r max And 0.5r max The calculated m is m 4 K is k 4 ，0.5r max And 0.6r max The calculated m is m 5 K is k 5 ，0.6r max And 0.7r max The calculated m is m 6 K is k 6 ，0.7r max And 0.8r max The calculated m is m 7 K is k 7 ，0.8r max And 0.9r max The calculated m is m 8 K is k 8 And 0.9r max And r max The calculated m is m 9 K is k 9 And substituting the obtained m and k into the light intensity calculation equation to obtain r e (0.2 r) max ,0.3r max ) To r ∈ (0.9 r) max ,r max ) The corresponding light intensity calculation model. When r is>r max When the light is near infrared light, the Lux is 0.
Finally dividing the r value into 10 segments which are respectively [0,0.2r ] max )，[0.2r max ,0.3r max )，[0.3r max ,0.4r max )，[0.4r max ,0.5r max )，[0.5r max ,0.6r max )，[0.6r max ,0.7r max )，[0.7r max ,0.8r max )，[0.8r max ,0.9r max )，[0.9r max ,r max )，[r max And infinity) and obtaining a light intensity calculation model corresponding to each interval. Therefore, the visible light intensity illumination value can be calculated through a plurality of light intensity calculation models obtained by the debugging method of the light intensity calculation model.
Referring to FIG. 3, a schematic diagram of a system 300 for measuring visible intensity illuminance according to another embodiment of the present invention is shown. As shown in FIG. 3, the visible intensity illuminance value measurement system 300 includes a non-transitory machine readable medium 400.
The non-transitory machine-readable medium 400 stores a program (not shown) for measuring a visible light intensity illuminance value in an environment when the program is executed by a processing unit (not shown), and the program includes a digital ambient light sensor module 410, a digital infrared light sensor module 420 and an operation processing module 430.
The digital ambient light sensor module 410 collects visible light and infrared light in the environment, processes the collected visible light and infrared light into an ambient light digital signal, and uploads the ambient light digital signal to the operation processing module 430 through an I2C bus, where the ambient light digital signal is represented by CH 0. The digital infrared light sensor module 420 collects infrared light in the environment, processes the infrared light into an infrared light digital signal, and uploads the infrared light digital signal to the operation processing module 430 through the I2C bus, where the infrared light digital signal is represented by CH 1. The operation processing module 430 performs an operation on the ambient light digital signal and the infrared light digital signal to calculate the visible light intensity illumination value, wherein the operation processing module 430 is established by the following steps, including step 431, step 432, step 433, and step 434.
Step 431 is to perform an operation ratio calculation step, which is to calculate the ratio between the infrared digital signal and the ambient light digital signal as an operation ratio, where the operation ratio is represented by r, and is defined as CH1/CH 0.
Step 432 is to provide a debugging method 100 of the light intensity calculation model as described above, calculate m and k values under different spectra by adjusting visible light and infrared light, and then substitute the m and k values into a light intensity calculation equation according to the m and k values, respectively, to obtain a plurality of debugged light intensity calculation models.
Step 433 is a selection step of comparing the operation ratio r with the channel ratio r n And a maximum channel ratio r max Selecting a corresponding light intensity calculation model from the plurality of debugged light intensity calculation models.
Step 434 is a step of calculating the visible light intensity illuminance value by substituting the digital ambient light signal and the digital infrared light signal into the selected light intensity calculation model.
Referring to fig. 4, a flowchart of the operation processing module 430 according to the embodiment of fig. 3 is shown. First, in step 431, a ratio between the infrared light digital signal CH1 obtained by the digital infrared light sensor module 420 and the ambient light digital signal CH0 obtained by the digital ambient light sensor module 410 is calculated as an operation ratio r. Next, the channel ratio r obtained according to step 432 of FIG. 3 n And the maximum channel ratio r max In step 433, the operation ratio r and the channel ratio r are compared n And a maximum channel ratio r max The corresponding light intensity calculation model is selected, for example, because ofSo that r is 0<0.2r max When the first parameter value is selected as m 1 The second parameter value is k 1 And substituting the corresponding CH1 and CH0 into the selected light intensity calculation model according to step 434 of FIG. 3, thereby calculating the visible light intensity illumination value, however, if r is equal to>0.2r max Then continue to compare r with 0.3r max The size of (2). When r is<0.3r max When the first parameter value is selected as m 2 The second parameter value is k 2 If r is the light intensity calculation model of>0.3r max Then continue to compare r with Nr max And so on. In detail, when r is<Nr max When the first parameter value is selected as m Y The second parameter value is k Y Wherein N is 0.4, 0.5, 0.6, 0.7, 0.8 and 0.9 in order, and Y is 3, 4, 5, 6, 7 and 8 in order. Finally, when r is<r max When the first parameter value is selected as m 9 The second parameter value is k 9 If r is the light intensity calculation model of>r max It means that the environment is almost all infrared light, so the obtained visible light has an illumination value of 0.
In summary, the debugging method of the light intensity calculation model of the present invention simulates ambient light by using the optical debugging devices of the ambient light sensor and the infrared light sensor at the same time, and adjusts the voltage and current of the visible light LED light source and the infrared light LED light source to calculate the parameter values of m and k under different spectra, wherein the output of the infrared light sensor is used for compensating the interference of infrared light in the ambient light sensor, and no V (λ) correction filter is required to be added, so that the optical design becomes flexible and simple. Furthermore, through the visible light intensity illumination value measuring system, the finally debugged light intensity calculation model is determined through different proportions of the infrared light sensor and the environment light sensor so as to accurately measure the visible light intensity illumination value in the environment light.
Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.
Claims (10)
1. A method for debugging a light intensity calculation model is characterized by comprising the following steps:
providing an optical debugging device, wherein the optical debugging device comprises:
the light sensing device comprises an ambient light sensor and an infrared light sensor, wherein the ambient light sensor is used for outputting an ambient light channel value, and the infrared light sensor is used for outputting an infrared light channel value;
the LED fixing table comprises a visible light LED light source and an infrared light LED light source, and the LED fixing table is arranged above the light sensing device; and
a black light shield for shielding the optical debugging device;
obtaining a maximum channel ratio, and turning on the infrared light LED light source to obtain the maximum channel ratio between the measured infrared light channel value and the ambient light channel value;
performing an adjusting step, adjusting the voltage and current of the visible light LED light source and the infrared light LED light source to select a plurality of channel ratios, wherein each channel ratio is the maximum channel ratio multiplied by a proportional constant;
performing a measurement step to measure the ambient light channel value and the infrared light channel value corresponding to each channel ratio respectively;
performing a recording step, replacing the optical sensing device with a standard illuminometer, so as to record a light intensity illuminance value corresponding to each channel ratio and the maximum channel ratio; and
and performing a calculation step, substituting the environment light channel value, the infrared light channel value and the light intensity illumination value corresponding to each channel ratio and the maximum channel ratio into a light intensity operation equation to obtain a plurality of first parameter values and a plurality of second parameter values, and obtaining a plurality of light intensity calculation models according to the first parameter values and the second parameter values.
2. The method as claimed in claim 1, wherein the optical adjustment device further comprises a caliper and a fixing screw, and the LED fixing stage is fixed to the caliper by the fixing screw.
3. The method as claimed in claim 2, wherein the distance between the LED fixing stage and the light sensor is adjusted by the fixing screw.
4. The method as claimed in claim 1, wherein the number of the channel ratios is nine.
5. The method as claimed in claim 4, wherein the proportionality constant is less than 1.
6. The method as claimed in claim 5, wherein the proportionality constants of the channel ratios are sequentially 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8 and 0.9.
7. The method for tuning an optical intensity calculation model according to claim 6, wherein the optical intensity calculation equation is the equation shown in formula (I):
lux ═ mx (CH 0-kxch 1) formula (I);
where Lux is the illumination intensity value, CH0 is the ambient light channel value, CH1 is the infrared light channel value, m is the first parameter value, and k is the second parameter value.
8. The method as claimed in claim 7, further comprising selecting the channel ratio of two adjacent sets of proportionality constants and the ambient light channel value, the infrared light channel value and the intensity illumination value corresponding to the maximum channel ratio to be substituted into the intensity calculation equation to obtain the first parameter values and the second parameter values, wherein one of the first parameter values and one of the second parameter values are correspondingly substituted into the intensity calculation equation to obtain the intensity calculation model of the channel ratio interval of two adjacent sets of proportionality constants.
9. A visible intensity illuminance value measurement system, comprising:
a non-transitory machine readable medium storing a program for measuring a visible light intensity illuminance value in an environment when the program is executed by a processing unit, the program comprising:
the digital ambient light sensor module is used for collecting visible light and infrared light in the environment and processing the visible light and the infrared light into an ambient light digital signal;
the digital infrared light sensor module is used for collecting infrared light in the environment and processing the infrared light into an infrared light digital signal;
an operation processing module, which is used for operating the environment light digital signal and the infrared light digital signal to calculate the visible light illumination value, and the operation processing module is established by the following steps:
performing an operation ratio calculation step to calculate the ratio between the infrared digital signal and the ambient light digital signal as an operation ratio;
providing a method of tuning a light intensity calculation model according to any one of claims 1 to 8;
performing a selection step, comparing the operation ratio with the channel ratios and the maximum channel ratio, and selecting the corresponding light intensity calculation model;
and carrying out a visible light intensity illumination value calculation step, and substituting the environment light digital signal and the infrared light digital signal into the light intensity calculation model to obtain the visible light intensity illumination value.
10. The system of claim 9, wherein the visible intensity illumination value is 0 when the operation ratio is greater than the maximum channel ratio.
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