CN107588857A - Infrared ray position sensing apparatus - Google Patents
Infrared ray position sensing apparatus Download PDFInfo
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- CN107588857A CN107588857A CN201610528715.3A CN201610528715A CN107588857A CN 107588857 A CN107588857 A CN 107588857A CN 201610528715 A CN201610528715 A CN 201610528715A CN 107588857 A CN107588857 A CN 107588857A
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Abstract
A kind of infrared ray position sensing apparatus includes a pyroelectricity pile sensing element and a signal processor.Pyroelectricity pile sensing element senses the infrared ray radiated in a sensing range, and exports one first corresponding sensing signal.Signal processor is electrically connected with pyroelectricity pile sensing element, and the first sensing signal is handled to obtain a background sensing value and a presently sensed value, wherein signal processor judges whether the difference of presently sensed value and background sensing value is more than one first critical value, to determine to whether there is an object in sensing range, and export a corresponding control signal.Above-mentioned infrared ray position sensing apparatus can still distinguish human body with the presence or absence of in sensing range in the case of human body transfixion.
Description
Technical field
The present invention is about a kind of position sensing apparatus (Occupancy sensor), particularly a kind of infrared ray position
Put sensing device further.
Background technology
Carbon reduction is the common issue that current people are faced.Along with economic growth, household electricity is because shining
The popularization of bright, refrigerator, air-conditioning system forms the growth of great-jump-forward.Therefore, household electrical appliances or the control of energy-conservation are developed
System is very urgent.According to statistics, domestic lighting accounts for the ratio about 15% of household electricity, and air-conditioning system accounts for
The ratio of household electricity about 19-22%.Human body sensor detection sensing range can comfortably be utilized with energy-conservation by being intended to take into account
Inside whether someone exists.When people is not in sensing range automatically into energy saver mode, for example, close illumination or
Adjust air-conditioning parameter.For hotel or commercial location, human body sensor then can more show energy-saving benefit, such as
It can produce 20-28% energy-saving effect.
It is well known, however, that position of human body sensor be to use burnt electric-type (pyroelectric) infrared ray sensing mostly
Device, such as passive type (passive infrared sensor, PIR) infrared position sensor.However, burnt electricity
Formula infrared position sensor senses for dynamic, that is, can only detect human body on the move, when human body is static not
Then no signal exports when dynamic.Therefore, burnt electric-type infrared position sensor can not differentiate human body not in sensing model
The situation enclosed interior and human body in sensing range but do not moved.This at some using upper, such as reading lamp,
Toilet lighting, hotel air-conditioning etc., when often result in puzzlement.
In view of this, there is provided a kind of infrared line position sense that can determine whether to whether there is an object in sensing range
It is the target that current pole need to make great efforts to survey device.
The content of the invention
The present invention provides a kind of infrared ray position sensing apparatus, and it utilizes the sense of pyroelectricity pile sensing element sensing one
The infrared ray radiated in the range of survey, and a background sensing value and a presently sensed value is calculated, so
Can according to it is presently sensed value and background sensing value difference and a critical value, judge be in sensing range
It is no an object to be present, and export a corresponding control signal.
The infrared ray position sensing apparatus of one embodiment of the invention includes a pyroelectricity pile sensing element and a letter
Number processor.Pyroelectricity pile sensing element senses the infrared ray radiated in a sensing range, and exports corresponding
One first sensing signal.Signal processor is electrically connected with pyroelectricity pile sensing element, and handles the first sensing
Signal judges presently sensed value to obtain a background sensing value and a presently sensed value wherein signal processor
And whether the difference of background sensing value is more than one first critical value, to determine to whether there is one in sensing range
Object, and export a corresponding control signal.
Coordinate appended schema elaborate by specific embodiment below, when the mesh for being easier to understand the present invention
, technology contents, feature and its it is reached the effect of.
Brief description of the drawings
Fig. 1 is a schematic diagram, shows the infrared ray position sensing apparatus of one embodiment of the invention.
Fig. 2 is a schematic diagram, shows the time sequential routine of the infrared ray position sensing apparatus of one embodiment of the invention.
Fig. 3 is a schematic diagram, when showing that the operation of device is surveyed in the infrared ray sense position of another embodiment of the present invention
Sequence.
Symbol description
1 infrared ray position sensing apparatus
11 pyroelectricity pile sensing elements
12 signal processors
121 amplifiers
122 multiplexers
123 analog-to-digital converters
124 microcontrollers
13 optical filters
14 lens
15 thermistors
16 communication interfaces
BCS sequential
CS control signals
The time delays of DT1 first
The time delays of DT2 second
The time delays of DT3 the 3rd
The sensing signal of SS1+, SS1- first
The sensing signals of SS2 second
TH1 sequential
TH2 sequential
The Δ T time differences
Embodiment
Various embodiments of the present invention are will be described below, and coordinate schema illustratively.Except it is the plurality of specifically
Outside bright, the present invention also can be widely performed in other embodiments, and any embodiment is replaced easily
Generation, modification, equivalence changes are intended to be included within, and are defined by claim.Saying
In the description of bright book, in order that reader has more complete understanding to the present invention, there is provided many specific details；
However, the present invention may can still be implemented on the premise of clipped or whole specific details.It is in addition, many
Well known step or element is not described in details, to avoid forming the present invention unnecessary limitation.
Same or similar element will be represented with same or like symbol in schema.It is specifically intended that schema is only
For the size or quantity of the use of signal, not representation element reality, some details may not drawn completely, with
Ask the succinct of schema.
Fig. 1 is refer to, the infrared ray position sensing apparatus 1 of one embodiment of the invention includes a thermoelectric pile sense
Survey the signal processor 12 of element 11 and one.In an embodiment, pyroelectricity pile sensing element 11 and signal
Processor 12 is packaged in single packaging part.Pyroelectricity pile sensing element 11 is sensing institute in a sensing range
The infrared ray of radiation, and export one first corresponding sensing signal SS1+, SS1-.In an embodiment,
The infrared ray position sensing apparatus 1 of the present invention further includes an optical filter 13, and it is arranged at pyroelectricity pile sensing element
11 receiving terminal.Optical filter 13 allows the light of an infrared wavelength range to pass through and partial filtration or complete
Portion filters out the light beyond infrared wavelength range.In an embodiment, infrared wavelength range can be
1-14μm。
In an embodiment, infrared ray position sensing apparatus 1 of the invention further includes a lens 14, and it is set
In the receiving terminal of pyroelectricity pile sensing element 11.Lens 14 can assemble infrared ray in a sensing visual angle to thermoelectricity
Heap sensing element 11, in other words, lens 14 limit a sensing visual angle of pyroelectricity pile sensing element 11.Citing
For, sensing visual angle may be less than or equal to 15 degree.Can be saturating it is understood that the material of lens 14 is necessary
Penetrate infrared ray.In an embodiment, lens 14 can be siliceous lens or germanium matter lens.For example, thoroughly
Mirror 14 can be siliceous Fresnel lens.In an embodiment, a filter coating can be set in the surface of lens 14,
Its effect is identical with optical filter 13.
Signal processor 12 is electrically connected with pyroelectricity pile sensing element 11.Signal processor 12 can handle heat
Pile sensing element 11 exports first sensing signal SS1+, SS1- to obtain a background sensing value and one
Presently sensed value, signal processor 12 can determine whether the difference of presently sensed value and background sensing value is big
In one first critical value, to determine to whether there is in sensing range an object, such as human body, and phase is exported
Corresponding control signal CS.Illumination or air-conditioning can make appropriate adjustment, example according to control signal CS
Illumination or air-conditioning are such as closed, or heightens the design temperature of air-conditioning.
For example, infrared ray position sensing apparatus 1 of the invention on startup, pyroelectricity pile sensing element 11
The infrared ray in sensing range is received, and exports the first corresponding sensing signal.Signal processor 12
Background sensing value is used as using the first sensing signal that pyroelectricity pile sensing element 11 is exported in the initial period.
Then, pyroelectricity pile sensing element 11 receives the infrared ray in sensing range in next cycle again, and exports
The first corresponding sensing signal.Signal processor 12 is i.e. defeated in this cycle by pyroelectricity pile sensing element 11
The first sensing signal gone out is as presently sensed value.If it is presently sensed value (sensing value in i.e. latter cycle) and
The difference of background sensing value (sensing value in i.e. previous cycle) is more than one first critical value, that is, represents sensing range
An object of infrared radiation, such as human body inside be present, now, signal processor 12 is exported and represented
The control signal CS of first state, such as the control signal CS of high potential.If presently sensed value and background
The difference of sensing value is less than or equal to one first critical value, that is, represents in sensing range and infrared radiation is not present
Object, now signal processor 12 is to export to represent the control signal CS of the second state, such as low electricity
The control signal CS of position.It is understood that in sensing range may because season, weather, the time and it is slow
Heating or cooling, therefore, if the difference of presently sensed value and background sensing value is faced less than or equal to one first
During dividing value, presently sensed value can be set as background sensing value by signal processor 12, to be used as next cycle
Judgment standard.
Fig. 2 is refer to, wherein sequential TH1 represents the difference and first of presently sensed value and background sensing value
The comparative result of critical value.In the embodiment shown in Fig. 2, the sequential TH1 of high potential represents presently sensed
The difference of value and background sensing value is more than the first critical value, and the sequential TH1 of low potential represents presently sensed value
And the difference of background sensing value is less than or equal to the first critical value.In an embodiment, in presently sensed value
And the difference of background sensing value is when being more than the first critical value, countable one first delay of signal processor 12
After time DT1, just output corresponds to the control signal CS of first state.Likewise, presently sensed
When the difference of value and background sensing value is less than or equal to the first critical value, signal processor 12 countable one
After second time delay DT2, just output corresponds to the control signal CS of the second state.In an embodiment
In, the first time delay DT1 is less than the second time delay DT2.It is understood that the first time delay
DT1 is shorter, quickly starts related electronic device when user can be allowed to enter in sensing range, for example, illumination and
/ or air-conditioning.For example, the first time delay DT1 is between the 0-1 seconds.And the second time delay DT2 compared with
It is long, the setting state for malfunctioning or frequently adjusting electronic installation caused by noise jamming can be avoided.Citing
For, the second time delay DT2 is between the 2-10 seconds.
Referring again to Fig. 2, wherein sequential BCS represents whether recalculate background sensing value.In shown in Fig. 2
Embodiment in, the sequential BCS of high potential represents stopping and recalculates background sensing value, the sequential of low potential
BCS is represented and is recalculated background sensing value.In an embodiment, in presently sensed value and background sensing value
Difference when being more than or equal to the first critical value, signal processor 12 is that background sensing value is recalculated in stopping,
That is, background sensing value is when being locked in the difference of presently sensed value and background sensing value and being more than the first critical value
Background sensing value.When control signal CS is the second state, signal processor 12 counts one the 3rd delay
After time DT3, background sensing value is just recalculated, that is, the background in next cycle is used as using presently sensed value
Sensing value.In an embodiment, the 3rd time delay DT3 is more than or equal to 2 seconds.The back of the body is recalculated in stopping
Scape sensing value can prevent the infrared ray that object (such as human body) is radiated from adding up to background sensing value.
Fig. 3 is refer to, wherein sequential TH2 represents the difference and second of presently sensed value and background sensing value
The comparative result of critical value.In the embodiment shown in Fig. 2, the sequential TH2 of high potential represents presently sensed
The difference of value and background sensing value is more than the second critical value, and the sequential TH2 of low potential represents presently sensed value
And the difference of background sensing value is less than or equal to the second critical value.In an embodiment, in presently sensed value
And the difference of background sensing value, when being more than or equal to the second critical value, background sensing value is recalculated in stopping.
For example, the second critical value is less than the first critical value.In this way, can be in presently sensed value and background sensing
The difference of value stops background sensing value again, time difference Δ as shown in Figure 3 before being more than the first critical value
T, that is, lock background sensing value.In an embodiment, the second critical value can be two points of the first critical value
One.And when control signal CS is the second state, signal processor 12 counted for one the 3rd time delay
After DT3, background sensing value is just recalculated.
Referring again to Fig. 1, in an embodiment, infrared ray position sensing apparatus 1 of the invention further includes one
Thermistor 15, it is electrically connected with signal processor 12.Thermistor 15 can sense an environment temperature simultaneously
Export one second sensing signal SS2.The environment that signal processor 12 can be sensed according to thermistor 15
Temperature (i.e. the second sensing signal SS2) adjusts the first critical value.For example, when environment temperature is close to human body
During temperature, such as 32 degrees celsius, the difference of presently sensed value and background sensing value relatively diminish.Now,
The second sensing signal SS2 that signal processor 12 can utilize thermistor 15 to be exported learns current environment
Temperature, and first critical value appropriate according to current environment temperature adjustment, such as reduce the first critical value.
It is understood that infrared ray position sensing apparatus 1 further includes a communication interface 16, itself and signal processor
12 be electrically connected with, make infrared ray position sensing apparatus 1 can via communication interface 16 and PERCOM peripheral communication, such as
Set first/second critical value, sensing value of output infrared ray position sensing apparatus 1 etc..In an embodiment,
Communication interface 16 can be IC bus (Inter-Integrated Circuit Bus, I2C), universal asynchronous
Receiver transmitter (Universal Asynchronous Receiver/Transmitter, UART), serial peripheral connect
Mouth (Serial Peripheral Interface, SPI) and universal serial bus (Universal Serial Bus, USB)
Deng interface.
In an embodiment, signal processor 12 includes an amplifier 121, a multiplexer 122, one is simulated
To digital quantizer (Analog-to-digital converter, ADC) 123 and a microcontroller 124.Amplification
Device 121 is electrically connected with pyroelectricity pile sensing element 11, with amplify that pyroelectricity pile sensing element 11 is exported
One sensing signal.Multiplexer 122 and amplifier 121 and thermistor 15, amplification is exported with selectivity
First sensing signal or the second sensing signal.Analog-to-digital converter 123, it is electrical with multiplexer 122
Connection, the first sensing signal or the second sensing signal multiplexer 122 to be exported are converted to a numeral
Signal.Microcontroller 124 is electrically connected with analog-to-digital converter 123.Microcontroller 124 calculates the
The data signal of one sensing signal or the second sensing signal obtains presently sensed value, background sensing value and environment
Temperature, and according to presently sensed value, background sensing value and the first critical value, export corresponding control letter
Number CS.The Detailed Operation mode of signal processor 12 is as it was previously stated, will not be repeated here.
Summary, infrared ray position sensing apparatus of the invention are to utilize pyroelectricity pile sensing element sensing one
The infrared ray radiated in sensing range, and a background sensing value and a presently sensed value foundation is calculated
The difference and a critical value of presently sensed value and background sensing value, judge to whether there is one in sensing range
Object.Therefore, in the case of human body transfixion, infrared ray position sensing apparatus of the invention still may be used
Differentiate human body to whether there is in sensing range, with lacking for burnt electric-type infrared position sensor known to solution
Fall into.
Embodiment described above is only technological thought and feature to illustrate the invention, and its purpose makes to be familiar with
The personage of this skill can understand the content of the present invention and implement according to this, when can not with restriction the present invention
The scope of the claims, i.e., the equivalent change made generally according to disclosed spirit or modification, should cover
In the scope of the claims of the present invention.
Claims (21)
1. a kind of infrared ray position sensing apparatus, it is characterised in that include：
One pyroelectricity pile sensing element, it is and defeated to sense the infrared ray radiated in a sensing range
Go out one first corresponding sensing signal；And
One signal processor, it is electrically connected with the pyroelectricity pile sensing element, and handles first sensing
To obtain a background sensing value and a presently sensed value, the wherein signal processor judges to deserve signal
Whether the difference of preceding sensing value and the background sensing value is more than one first critical value, to determine the sensing
In the range of whether there is an object, and export a corresponding control signal.
2. infrared ray position sensing apparatus as claimed in claim 1, it is characterised in that more wrap
Contain：
One optical filter, it is arranged at the receiving terminal of the pyroelectricity pile sensing element, and allows an infrared wave
The light of long scope passes through.
3. infrared ray position sensing apparatus as claimed in claim 2, it is characterised in that this is infrared
Line wave-length coverage is 1-14 μm.
4. infrared ray position sensing apparatus as claimed in claim 1, it is characterised in that more wrap
Contain：
One lens, it is arranged at the receiving terminal of the pyroelectricity pile sensing element, to limit thermoelectric pile sensing
One sensing visual angle of element.
5. infrared ray position sensing apparatus as claimed in claim 1, it is characterised in that more wrap
Contain：
One Fresnel lens, it is arranged at the receiving terminal of the pyroelectricity pile sensing element, to limit the thermoelectricity
One sensing visual angle of heap sensing element.
6. infrared ray position sensing apparatus as claimed in claim 1, it is characterised in that more wrap
Contain：
One Fresnel lens, it is arranged at the receiving terminal of the pyroelectricity pile sensing element, to limit the thermoelectricity
One sensing visual angle of heap sensing element；And
One filter coating, it is arranged at a surface of the Fresnel lens, and allows an IR wavelength model
The light enclosed passes through.
7. infrared ray position sensing apparatus as claimed in claim 1, it is characterised in that more wrap
Contain：
One thermistor, itself and the signal processor are electrically connected with, and the wherein thermistor is sensing
One environment temperature simultaneously exports one second sensing signal, and the signal processor is according to second sensing signal
Adjust first critical value.
8. infrared ray position sensing apparatus as claimed in claim 7, it is characterised in that the signal
Processor includes：
One amplifier, it is electrically connected with the pyroelectricity pile sensing element, to amplify first sensing signal；
One multiplexer, itself and the amplifier and the thermistor, with selectivity export amplification this
One sensing signal or second sensing signal；
One analog-to-digital converter, it is electrically connected with the multiplexer, to multiplexer institute is defeated
First sensing signal or second sensing signal gone out is converted to a data signal；And
One microcontroller, it is electrically connected with the analog-to-digital converter, and presently sensed according to this
Value, the background sensing value and first critical value, export the corresponding control signal.
9. infrared ray position sensing apparatus as claimed in claim 1, it is characterised in that more wrap
Contain：
One communication interface, it is electrically connected with the signal processor, makes the infrared ray position sensing apparatus
Via the communication interface and PERCOM peripheral communication.
10. infrared ray position sensing apparatus as claimed in claim 1, it is characterised in that the thermoelectricity
Heap sensing element and the signal processor are packaged in single packaging part.
11. infrared ray position sensing apparatus as claimed in claim 1, it is characterised in that the signal
Processor is when the difference of sensing value and the background sensing value is more than first critical value in this prior, meter
The time delay of number one first simultaneously exports the control signal for corresponding to a first state.
12. infrared ray position sensing apparatus as claimed in claim 11, it is characterised in that this
One time delay is between the 0-1 seconds.
13. infrared ray position sensing apparatus as claimed in claim 11, it is characterised in that the letter
To be less than or equal to this first critical for the difference of sensing value and the background sensing value in this prior for number processor
During value, counted for one second time delay and export the control signal for one second state that corresponds to.
14. infrared ray position sensing apparatus as claimed in claim 13, it is characterised in that this
One time delay was less than second time delay.
15. infrared ray position sensing apparatus as claimed in claim 13, it is characterised in that this
Two time delays are between the 2-10 seconds.
16. infrared ray position sensing apparatus as claimed in claim 1, it is characterised in that the signal
The difference of sensing value and the background sensing value is more than or equal to one second critical value to processor in this prior
When, stopping recalculates the background sensing value wherein, and second critical value is less than first critical value.
17. infrared ray position sensing apparatus as claimed in claim 16, it is characterised in that this
Two critical values are the one of two points of first critical value.
18. infrared ray position sensing apparatus as claimed in claim 16, it is characterised in that the letter
Number processor counted for one the 3rd time delay, and count again when the control signal is second state
Calculate the background sensing value.
19. infrared ray position sensing apparatus as claimed in claim 18, it is characterised in that this
Three time delays were more than or equal to 2 seconds.
20. infrared ray position sensing apparatus as claimed in claim 1, it is characterised in that the signal
The difference of sensing value and the background sensing value is more than or equal to first critical value to processor in this prior
When, the background sensing value is recalculated in stopping.
21. infrared ray position sensing apparatus as claimed in claim 20, it is characterised in that the letter
Number processor counted for one the 3rd time delay, and count again when the control signal is second state
Calculate the background sensing value.
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| CN201610528715.3A CN107588857A (en) | 2016-07-06 | 2016-07-06 | Infrared ray position sensing apparatus |
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| CN201610528715.3A CN107588857A (en) | 2016-07-06 | 2016-07-06 | Infrared ray position sensing apparatus |
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Family
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| CN201610528715.3A Withdrawn CN107588857A (en) | 2016-07-06 | 2016-07-06 | Infrared ray position sensing apparatus |
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| CN110426748A (en) * | 2019-08-26 | 2019-11-08 | 深圳市枫芒科技有限公司 | There are detection method, device, storage mediums for quasi- static human body |
| CN110631229A (en) * | 2019-09-30 | 2019-12-31 | 广东美的制冷设备有限公司 | Air conditioner and wire controller control method, control device and readable storage medium thereof |
| CN111025416A (en) * | 2018-10-09 | 2020-04-17 | 众智光电科技股份有限公司 | Infrared sensing device |
| CN111123385A (en) * | 2019-11-11 | 2020-05-08 | 广州晨日电子技术有限公司 | Diffuse reflection type object detection method and device with self-learning function |
| CN111174923A (en) * | 2018-11-09 | 2020-05-19 | 众智光电科技股份有限公司 | Infrared array occupancy sensing device |
| CN112630852A (en) * | 2021-03-10 | 2021-04-09 | 南京初芯集成电路有限公司 | Double-light-path smoke sensing chip and smoke sensing method |
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Application publication date: 20180116 |