CN113820010B - Illuminance measuring device and method - Google Patents
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000005259 measurement Methods 0.000 claims abstract description 79
- 230000010354 integration Effects 0.000 claims abstract description 32
- 238000005286 illumination Methods 0.000 claims abstract description 15
- 230000004044 response Effects 0.000 claims abstract description 7
- 238000000691 measurement method Methods 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000013461 design Methods 0.000 description 8
- 230000009471 action Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
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- 230000000694 effects Effects 0.000 description 2
- 238000005282 brightening Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000013135 deep learning Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/4204—Photometry, e.g. photographic exposure meter using electric radiation detectors with determination of ambient light
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/44—Electric circuits
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/44—Electric circuits
- G01J2001/4446—Type of detector
- G01J2001/446—Photodiode
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The present invention relates to the field of illuminance measurement technologies, and in particular, to an illuminance measurement apparatus and method. The device comprises: at least one ambient light sensor, a controller, a display, a key; the ambient light sensor comprises a first photodiode for measuring a first light, a second photodiode for measuring a second light, and two analog-to-digital converters, the wavelength of the first light being smaller than the wavelength of the second light; the analog-to-digital converter is used for converting the currents generated by the first photodiode and the second photodiode into photoelectric measurement values and sending the photoelectric measurement values to the controller; the controller is used for converting the received photoelectric measurement value into an illumination value; the controller is further configured to receive a gain multiple and an integration time value generated in response to a key trigger; the gain multiple ranges from [1, 9876], and the integration time value ranges from [100ms,600ms ]. The scheme provided by the invention can realize the measurement from the low-light illumination of 188 micro lux to the high-light illumination of 88000 lux.
Description
Technical Field
The present invention relates to the field of illuminance measurement technologies, and in particular, to an illuminance measurement apparatus and method.
Background
At present, in the aspect of low-illumination image enhancement processing, a plurality of algorithms are applied to the enhancement processing of night scene low-illumination images, and the algorithms generally need to input gain factors, so that the requirements for quick and accurate measurement of ambient light are put forward, and especially in the research fields of computer vision, deep learning and the like, the acquisition of reliable ambient light illumination data is a necessary condition for relevant research.
In the prior art, only consumer-grade products capable of measuring 1 lux are available on the market, and the illumination value of a starlight-grade environment cannot be estimated.
Therefore, it is desirable to provide an illuminance measuring device and method for solving the above-mentioned problems.
Disclosure of Invention
The invention provides an illuminance measuring device and an illuminance measuring method, which are used for measuring the dim light illuminance from 188 micro lux to 88000 lux.
In a first aspect, an embodiment of the present invention provides an illuminance measurement apparatus, including: at least one ambient light sensor, a controller, a display, keys, and a power source;
the ambient light sensor comprises a first photodiode for measuring first light, a second photodiode for measuring second light and two analog-to-digital converters, wherein the first photodiode is electrically connected with the input end of one analog-to-digital converter, the second photodiode is electrically connected with the input end of the other analog-to-digital converter, and the wavelength of the first light is smaller than that of the second light;
the output ends of the two analog-to-digital converters are electrically connected with the controller, and the analog-to-digital converters are used for converting currents generated by the first photodiode and the second photodiode into photoelectric measurement values and sending the photoelectric measurement values to the controller;
the controller is electrically connected with the display, and is used for converting the received photoelectric measurement value into an illumination value and sending the illumination value to the display for display;
the controller is electrically connected with the key, and is further used for receiving a gain multiple and an integral time value generated in response to the key trigger, generating a measurement instruction based on the received gain multiple and the integral time value, sending the measurement instruction to the ambient light sensor, and sending the received gain multiple and the received integral time value to the display for display; wherein the interval range of the gain multiple is [1, 9876], and the interval range of the integration time value is [100ms,600ms ];
the controller is electrically connected with the power supply.
In one possible design, the device further comprises a data memory, wherein the data memory is electrically connected with the controller and is used for storing the illuminance value calculated by the controller.
In one possible design, the device further comprises an external bus interface, and the external bus interface is electrically connected with the controller, so as to connect an external terminal device through the external bus interface.
In one possible design, the display employs a monochrome OLED screen.
In one possible design, the controller calculates the illuminance value using the following formula:
lux＝(ch1-ch2)*(1-(ch2/ch1)/k
where lux is the illuminance value, ch1 is the photoelectric measurement value of the first light, ch2 is the photoelectric measurement value of the second light, and k is a coefficient proportional to the product of the gain multiple and the integration time value.
In a second aspect, an embodiment of the present invention provides an illuminance measurement method, including:
measuring a first light and a second light in an environment with a first photodiode and the second photodiode of an ambient light sensor, respectively, to generate a current; wherein the wavelength of the first light is less than the wavelength of the second light;
converting the currents generated by the first photodiode and the second photodiode into photoelectric measurement values by using an analog-to-digital converter, and transmitting the photoelectric measurement values to a controller;
converting the received photoelectric measurement value into an illuminance value by using the controller, and sending the illuminance value to a display for display;
receiving a gain multiple and an integration time value generated in response to key triggering by using the controller, generating a measurement instruction based on the received gain multiple and integration time value, transmitting the measurement instruction to the ambient light sensor, and transmitting the received gain multiple and integration time value to the display for display; wherein the gain multiple has a range of [1, 9876] and the integration time value has a range of [100ms,600ms ].
In one possible design, the method further comprises:
and storing the illuminance value calculated by the controller by using a data memory.
In one possible design, the method further comprises:
and connecting the controller with external terminal equipment by using an external bus interface.
In one possible design, the display employs a monochrome OLED screen.
In one possible design, the controller calculates the illuminance value using the following formula:
lux＝(ch1-ch2)*(1-(ch2/ch1)/k
where lux is the illuminance value, ch1 is the photoelectric measurement value of the first light, ch2 is the photoelectric measurement value of the second light, and k is a coefficient proportional to the product of the gain multiple and the integration time value.
According to the scheme, the illuminance measuring device and the illuminance measuring method can measure the first light and the second light with different wavelengths by utilizing the first photodiode and the second photodiode, so that illuminance of the light with multiple spectrums can be accurately measured; by configuring different gain factors and integration time values, measurement of dim light illumination from 188 micro lux to 88000 lux can be achieved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are some embodiments of the invention and that other drawings may be obtained based on these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an illuminance measurement device according to an embodiment of the present invention.
Reference numerals:
11. an ambient light sensor; 12. a controller; 13. a display; 14. a key; 15. and a power supply.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments, and all other embodiments obtained by persons of ordinary skill in the art without making any inventive effort based on the embodiments of the present invention are within the scope of protection of the present invention.
Fig. 1 is a schematic structural diagram of an illuminance measurement device according to an embodiment of the present invention. As shown in fig. 1, an embodiment of the present invention provides an illuminance measuring apparatus, including: at least one ambient light sensor 11, a controller 12, a display 13, keys 14 and a power source 15;
the ambient light sensor 11 comprises a first photodiode for measuring a first light, a second photodiode for measuring a second light and two analog-to-digital converters, the first photodiode being electrically connected to an input of one of the analog-to-digital converters, the second photodiode being electrically connected to an input of the other analog-to-digital converter, the wavelength of the first light being smaller than the wavelength of the second light;
the output ends of the two analog-to-digital converters are electrically connected with the controller 12, and the analog-to-digital converters are used for converting the currents generated by the first photodiode and the second photodiode into photoelectric measurement values and sending the photoelectric measurement values to the controller 12;
the controller 12 is electrically connected with the display 13, and the controller 12 is used for converting the received photoelectric measurement value into an illuminance value and sending the illuminance value to the display 13 for display;
the controller 12 is electrically connected with the key 14, and the controller 12 is further configured to receive a gain multiple and an integration time value generated in response to the key 14 being triggered, generate a measurement instruction based on the received gain multiple and integration time value, send the measurement instruction to the ambient light sensor 11, and send the received gain multiple and integration time value to the display 13 for display; wherein the interval range of the gain multiple is [1, 9876], and the interval range of the integral time value is [100ms,600ms ];
the controller 12 is electrically connected to a power supply 15.
In the embodiment of the invention, the first light and the second light with different wavelengths can be measured by utilizing the first photodiode and the second photodiode, so that the illuminance of the multi-spectrum light can be accurately measured; by configuring different gain factors and integration time values, measurement of dim light illumination from 188 micro lux to 88000 lux can be achieved.
It should be noted that most of the conventional illuminance measurement devices can only detect ambient light in one spectral range or ambient light perceived by human eyes (because human eyes cannot perceive near infrared light detected by most of the photodiodes). In order to be able to accurately measure the illuminance of the multi-band light, the ambient light sensor of the above embodiment comprises a first photodiode for measuring a first light, which may be visible light, and a second photodiode for measuring a second light, which may be infrared light.
It should be noted that, the lowest detectable illuminance of the common illuminance measurement device in the market is only 1 lux, and the illuminance measurement device provided by the embodiment of the invention can combine the actual needs and fuse the data of a plurality of ambient light sensors so as to realize illuminance measurement with wider frequency spectrum and larger dynamic range.
It should be further noted that the controller 12 may communicate with the ambient light sensor 11 via an I2C protocol. Depending on the use requirements, the user may set the gain multiple and integration time value of the ambient light sensor 11 via the key 14 to make the illuminance measuring device more sensitive to ambient light or to avoid oversaturation. For example, the gain factor may be set to 1 (bright light), 25 (general use), 428 (starlight), 9876 (black light). The integration time value may be set between 100ms and 600ms, the longer the integration time, the more photons the ambient light sensor 11 receives and thus the more sensitive in low light.
In some embodiments, the controller 12 may be a low power microcontroller with a processing performance up to 20MIPS, and a 32 kbyte in-system programmable Flash, so as to implement reading of the key 14 event, and switching and display control of the display 13, which is beneficial to reducing power consumption when the illuminance measuring device is running, and reducing the measuring cost. Experiments show that the illuminance measuring device provided by the embodiment of the invention has low power consumption in operation, about 50 milliamp in active induction, less than 10 milliamp in sleep mode, and is very suitable for a low-power-consumption data recording system; meanwhile, the method can realize the measurement of extremely low illuminance value, can be used as a micro-illuminometer, and provides reference data for data acquisition and related research of night scene image brightening algorithm.
In some embodiments, the key 14 may be a five-way keyboard, and the gain factor may be changed at any time in cooperation with the controller 12 and the ambient light sensor 11 to adapt to brighter/darker illuminance measurement environment conditions.
In some embodiments, a data memory (not shown) is further included, and the data memory is electrically connected to the controller 12, and is configured to store the illuminance value calculated by the controller 12. The data memory may be a nonvolatile memory, a flash memory, a memory card (such as SD card or TF card), or the like.
In some embodiments, the system further includes an external bus interface (not shown in the figure), and the external bus interface is electrically connected to the controller 12, so as to connect an external terminal device through the external bus interface, to implement online measurement or output historical measurement data. Alternatively, the external bus interface may take the form of a USB interface.
In some embodiments, the display 13 employs a single color OLED screen. Thus, no light leakage phenomenon exists when the display is not performed, and no pollution interference exists to the measuring environment.
Since the OLED screen has a self-luminous property, backlight is not required, power consumption required for the operation state display 13 is reduced, the display screen has a high contrast, a display effect is excellent in a strong light environment, and power consumption when the illuminance measuring apparatus is operated is reduced.
In some embodiments, controller 12 calculates the illuminance value using the following formula:
lux＝(ch1-ch2)*(1-(ch2/ch1)/k
where lux is the illuminance value, ch1 is the photoelectric measurement value of the first light, ch2 is the photoelectric measurement value of the second light, and k is a coefficient proportional to the product of the gain multiple and the integration time value.
In the present embodiment, the controller 12 simultaneously reads the photoelectric measurement values of the first photoelectric switch and the second photodiode when calculating illuminance, so as to separate the photoelectric measurement values of different wavebands, improve measurement accuracy and facilitate calculation. The illuminance value of the light to be measured can be measured more accurately through the formula.
In use, the keys 14 provide a user interaction interface to perform specific functions including initiating measurements and setting parameter configurations (i.e., setting gain factors and integration time values). The controller 12 scans the user's key 14 inputs, completes the configuration of the gain factors and integration time values, and updates the changes to the OLED display 13. When the user presses the measurement key, an instruction to start measurement is input to the ambient light sensor 11; and after the measurement is finished, obtaining a photoelectric measurement value, and calculating according to the photoelectric measurement value and an illuminance value measurement formula to obtain a final illuminance value.
In addition, an embodiment of the present invention further provides an illuminance measurement method, including:
measuring first and second light in the environment with first and second photodiodes of an ambient light sensor, respectively, to generate a current; wherein the wavelength of the first light is smaller than the wavelength of the second light;
converting the currents generated by the first photodiode and the second photodiode into photoelectric measurement values by using an analog-to-digital converter, and sending the photoelectric measurement values to a controller;
converting the received photoelectric measurement value into an illumination value by using a controller, and sending the illumination value to a display for display;
receiving a gain multiple and an integration time value generated in response to key triggering by using a controller, generating a measurement instruction based on the received gain multiple and integration time value, transmitting the measurement instruction to an ambient light sensor, and transmitting the received gain multiple and integration time value to a display for display; the gain multiple ranges from [1, 9876], and the integration time value ranges from [100ms,600ms ].
In some embodiments, further comprising:
the illuminance value calculated by the controller is stored by a data memory.
In some embodiments, further comprising:
the controller is connected to external terminal devices by means of an external bus interface.
In some embodiments, the display employs a monochrome OLED screen.
In some embodiments, the controller calculates the illuminance value using the following formula:
lux＝(ch1-ch2)*(1-(ch2/ch1)/k
where lux is the illuminance value, ch1 is the photoelectric measurement value of the first light, ch2 is the photoelectric measurement value of the second light, and k is a coefficient proportional to the product of the gain multiple and the integration time value.
It can be appreciated that the illuminance measurement method and the illuminance measurement device are based on the same inventive concept, so that the illuminance measurement method and the illuminance measurement device have the same beneficial effects, and the effects of the illuminance measurement method are not described in detail herein.
It is noted that relational terms such as first and second, and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of additional identical elements in a process, method, article or apparatus that comprises the element.
Finally, it should be noted that: the foregoing description is only illustrative of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.
Claims (8)
1. An illuminance measurement device, comprising: at least one ambient light sensor, a controller, a display, keys, and a power source;
the ambient light sensor comprises a first photodiode for measuring first light, a second photodiode for measuring second light and two analog-to-digital converters, wherein the first photodiode is electrically connected with the input end of one analog-to-digital converter, the second photodiode is electrically connected with the input end of the other analog-to-digital converter, and the wavelength of the first light is smaller than that of the second light;
the output ends of the two analog-to-digital converters are electrically connected with the controller, and the analog-to-digital converters are used for converting currents generated by the first photodiode and the second photodiode into photoelectric measurement values and sending the photoelectric measurement values to the controller;
the controller is electrically connected with the display, and is used for converting the received photoelectric measurement value into an illumination value and sending the illumination value to the display for display;
the controller is electrically connected with the key, and is further used for receiving a gain multiple and an integral time value generated in response to the key trigger, generating a measurement instruction based on the received gain multiple and the integral time value, sending the measurement instruction to the ambient light sensor, and sending the received gain multiple and the received integral time value to the display for display; wherein the interval range of the gain multiple is [1, 9876], and the interval range of the integration time value is [100ms,600ms ];
the controller is electrically connected with the power supply;
the controller calculates the illuminance value by adopting the following formula:
lux =（ch1-ch2）*（1-（ch2/ch1））/k
where lux is the illuminance value, ch1 is the photoelectric measurement value of the first light, ch2 is the photoelectric measurement value of the second light, and k is a coefficient proportional to the product of the gain multiple and the integration time value.
2. A light measurement device as recited in claim 1, further comprising a data memory electrically connected to said controller for storing a light value calculated by said controller.
3. The illuminance measurement device of claim 1 further comprising an external bus interface electrically connected to the controller for connecting an external terminal device through the external bus interface.
4. A lighting device as recited in claim 1, wherein said display uses a single color OLED screen.
5. An illuminance measurement method, comprising:
measuring first and second light in the environment with first and second photodiodes of an ambient light sensor, respectively, to generate a current; wherein the wavelength of the first light is less than the wavelength of the second light;
converting the currents generated by the first photodiode and the second photodiode into photoelectric measurement values by using an analog-to-digital converter, and transmitting the photoelectric measurement values to a controller;
converting the received photoelectric measurement value into an illuminance value by using the controller, and sending the illuminance value to a display for display;
receiving a gain multiple and an integration time value generated in response to key triggering by using the controller, generating a measurement instruction based on the received gain multiple and integration time value, transmitting the measurement instruction to the ambient light sensor, and transmitting the received gain multiple and integration time value to the display for display; wherein the interval range of the gain multiple is [1, 9876], and the interval range of the integration time value is [100ms,600ms ];
the controller calculates the illuminance value by adopting the following formula:
lux =（ch1-ch2）*（1-（ch2/ch1））/k
where lux is the illuminance value, ch1 is the photoelectric measurement value of the first light, ch2 is the photoelectric measurement value of the second light, and k is a coefficient proportional to the product of the gain multiple and the integration time value.
6. A method of measuring illuminance according to claim 5, further comprising:
and storing the illuminance value calculated by the controller by using a data memory.
7. A method of measuring illuminance according to claim 5, further comprising:
and connecting the controller with external terminal equipment by using an external bus interface.
8. A method of measuring illuminance according to claim 5, wherein the display uses a monochrome OLED screen.
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| EP2432015A1 (en) * | 2007-04-18 | 2012-03-21 | Invisage Technologies, Inc. | Materials, systems and methods for optoelectronic devices |
| WO2009016600A2 (en) * | 2007-07-30 | 2009-02-05 | Nxp B.V. | Light sensor arrangement |
| JP5660755B2 (en) * | 2007-11-02 | 2015-01-28 | 株式会社ジャパンディスプレイ | Display device, display control method, and electronic device |
| JP2013207095A (en) * | 2012-03-28 | 2013-10-07 | Renesas Electronics Corp | Photoelectric conversion device |
| CN103747556B (en) * | 2013-10-12 | 2016-01-20 | 林应存 | A kind of method and device realizing exact luminance control |
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| US20200264489A1 (en) * | 2019-02-14 | 2020-08-20 | Visteon Global Technologies, Inc. | Electronic mirror with automatic luminance and automatic dimming control system |
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| CN111829654B (en) * | 2020-07-24 | 2023-03-24 | 北京小米移动软件有限公司 | Ambient light detection method and device, and computer storage medium |
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