CN209148884U - Infrared sensing device - Google Patents
Infrared sensing device Download PDFInfo
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- CN209148884U CN209148884U CN201821644002.4U CN201821644002U CN209148884U CN 209148884 U CN209148884 U CN 209148884U CN 201821644002 U CN201821644002 U CN 201821644002U CN 209148884 U CN209148884 U CN 209148884U
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Abstract
A kind of infrared sensing device, including infrared emission module, sension unit, ambient light compensation circuit and output control circuit.Infrared emission module includes modulator and infrared light emitting source, provides modulated pulsed infrared.Sension unit includes that light perception device and photoelectricity flow to electric pressure converter.Light perception device converts output light current signal to perceive including infrared signal and ambient light signal.Photoelectricity flow to electric pressure converter and receives photo-signal and be converted into pulse signal.Ambient light compensation circuit return pulse signal and output environment light thermal compensation signal.Output control circuit receives synchronous detection after comparison voltage and ambient light compensation signal respectively, and export determinand measures signal or dendrometry signal.
Description
[technical field]
The utility model is especially used in relation to a kind of infrared sensing device with ambient light compensation circuit
The highly sensitive infrared sensing device of intelligent household appliances.
[background technique]
Carbon reduction is the common issue that 21 century people face, and the household electrical appliances for promoting energy conservation mark chapter are even more very urgent.Root
It is counted according to EIA, Great Britain and America's domestic lighting accounts for 15%, accounts for 19-22% in terms of cold and hot gas.By position of human body sensor, when people not
When can automatically into energy-saving mode, use take into account it is comfortable with it is energy saving, be applied to hotel or business place, have more 20-28%
Energy-saving effect, show energy-saving benefit.
Conventional body's position sensor adopts burnt electric-type sensor (PIR), only can dynamically sense, when human body fix or for a long time
Then blackout when not moving, because burnt electric-type sensor can not differentiate people not or people but do not move, be such as applied to
Puzzlement is often resulted in whens reading lamp or toilet lighting etc., is also unable to reach energy-saving effect due to failing and closing cold air in due course.In addition, machine
With greater need for the presence of perception people, such as unmanned shop or vending machine in the interactive process of device and people, certainly when people walks close to
Dynamic bright light.Since people's residence time is different in size, need to perceive human body often in the sensor of (Occupancy), this is tradition
What burnt electric-type sensor can not be reached.
The water flushing device with cistern sensing human body distance that custom is known can only be 0.3 meter or so, this is because at remote (such as 1.5 meters)
When, reflected signal is inversely proportional with apart from biquadratic, 1.5 meters apart from when its reflect signal be 0.3 meter 0.16%,
Need more accurate compensation circuit, the presence of ability more reliable detection human body.In addition, siliceous light perception element, such as light two
All there is dark current output in pole pipe or optotransistor, environment temperature is every to increase by 10 DEG C, then dark current doubles.
On the other hand, the problem of voltage is made up in the calculation amplifier input used, light variation of use environment etc. also can shadows
Ringing the output for arriving light perception device can not be calculated, otherwise when the above reason senses remote human body with single comparator level
The environment of perception light variation can be much larger than the reflected signal of human body, and can not reliably sense human body often whether.
It is passing, once there is design that infrared light is modulated to high frequency (such as 38kHz) with modulator, it is dry to avoid noise signal
It disturbs, then to exchange amplification after band-pass filter, distinguishes determinand (such as human body) reflected optical signal and environment is miscellaneous
The dark current of astigmatism and light perception device.Only this mode, when exchanging amplification, environment stray light and the dark current of light perception device are still adjusted
It makes in received light pulse, and can not effectively exclude.
In conclusion how to overcome the drawbacks described above of existing infrared sensor is the target that current pole need to make great efforts.
[utility model content]
The utility model provides a kind of infrared sensing device, including infrared emission module, sension unit, environment light are mended
Repay circuit and output control circuit.Infrared emission module includes modulator and infrared light emitting source, provides modulated pulse
Infrared ray.Sension unit includes that light perception device and photoelectricity flow to electric pressure converter.Light perception device is (red to perceive infrared signal
Outside line signal is reflected ray of the modulated pulsed infrared via determinand) and ambient light signal, and convert output light electric current
Signal.Photoelectricity flow to electric pressure converter and receives photo-signal and be converted into pulse signal.Ambient light compensation circuit receives pulse
Signal and output environment light thermal compensation signal.Output control circuit receives respectively and compares a comparison voltage and ambient light compensation signal
Synchronous detection is done after comparator, and is exported and measured signal or dendrometry signal.
The utility model provides another infrared sensing device, including infrared emission module, sension unit, environment light
Compensation circuit and output control circuit.Wherein, ambient light compensation circuit return pulse signal and after low-pass filter filters,
Export filtered ambient light compensation signal.Output control circuit receives respectively and compares by the filtered arteries and veins of low-pass filter
Detection is synchronized after rushing signal and ambient light compensation signal, reduces photoelectric current conducting or the noise signal interference of breaking moment.
The utility model provides another embodiment, provides a kind of infrared sensing device, including infrared emission module, sense
Know unit, ambient light compensation circuit and output control circuit.Wherein, ambient light compensation circuit stops by the way that sampling circuit is received
Time zone sampled signal, after phase inverter, adder, two-stage amplifier and low-pass filter are processed, the compensation of output environment light
Signal.It between infrared emission module and output control circuit, is connected, is reduced because low-pass filter is made by detection delay circuit
At delayed impact.
Below by way of the appended schema elaborate of specific embodiment cooperation, when the mesh for being easier to understand the utility model
, technology contents, feature and its it is reached the effect of.
[Detailed description of the invention]
Fig. 1 is painted the infrared human body sensing device structural circuit schematic diagram according to an embodiment of the present invention.
Fig. 2 is painted the output timing diagram of the modulator according to an embodiment of the present invention.
Fig. 3 is painted the adder schematic diagram according to an embodiment of the present invention.
Fig. 4 is painted the infrared human body sensing device structural circuit schematic diagram according to another embodiment of the utility model.
Fig. 5 is painted the infrared human body sensing device structural circuit schematic diagram according to another embodiment of the utility model.
[symbol description]
1,2,3: infrared sensing device
10: infrared emission module
20: sension unit
30,32,34: ambient light compensation circuit
40: output control circuit
101: modulator
102: light emitting driver
103: infrared light emitting source
104: light perception device
105: photoelectricity flow to electric pressure converter
106: bias circuit
107: comparator
108: bias resistance
109: synchronous checking circuit
110: delay time adjuster
111: postponing resistance
112: postponing resistance
113: output pushes grade
114: open source output mos transistor
121: sampling circuit
122: adder
123: phase inverter
124: adder
125: two-stage amplifier
126,131,132: low-pass filter
133: detection delay circuit
[specific embodiment]
It will be described each embodiment of the utility model below, and cooperate schema as illustration.In addition to multiple detailed description
Except, the utility model also can be widely performed in other embodiments, the substitution easily of any embodiment, modification,
Equivalence changes are included in the scope of the utility model, and are subject to claim.In the description of specification, in order to
So that reader is had more complete understanding to the utility model, provides many specific details；However, the utility model may omit
It is still implementable under the premise of part or all of specific detail.Moreover, it is well known that the step of or element be not described in details
In, unnecessary limitation is formed to avoid to the utility model.Same or similar component will be with same or like symbol in schema
It number indicates.It is specifically intended that schema is only the use illustrated, the not actual size of representation element or quantity, some details
It may not draw completely, in the hope of the succinct of schema.
Referring to FIG. 1, being painted 1 structure chart of infrared human body sensing device according to an embodiment of the present invention.It is infrared
Line sensing device 1, including infrared emission module 10, sension unit 20, ambient light compensation circuit 30 and output control circuit 40.
Infrared emission module 10 includes modulator (modulator) 101, (e.g. LED drives product body electricity to light emitting driver 102
Road) and infrared light emitting source 103 (such as infrared light-emitting diode), to provide a modulated pulsed infrared.
Sension unit 20 be received in infrared emission module 10 by object reflection optical signal, including light perception device 104,
Photoelectricity flow to electric pressure converter 105 and bias circuit 106.Light perception device 104 to perceive an infrared signal (including by one to
Survey the infrared ray of object reflection) and an ambient light signal, and convert one photo-signal of output.Since light perception device 104 may
There is dark current output, this dark current is the function of environment temperature.Therefore, the photo-signal of output may include infrared ray letter
Number, ambient light signal (environment stray light) and dark current.
It is, for example, one turn of impedance amplifier that photoelectricity, which flow to electric pressure converter 105, and photoelectricity flow to an input of electric pressure converter 105
End is electrically connected at light perception device 104, receives photo-signal and is converted into pulse signal.Photoelectricity flow to electric pressure converter 105
An another input terminal be electrically connected at bias circuit 106, by bias circuit 106 and bias plasma group 108, it is inclined to provide a direct current
Pressure, this Dc bias can be by 108 modulation of bias plasma group, as a preset threshold threshold voltage.
Include a sampling circuit 121 and an adder 122, ambient light compensation circuit in the ambient light compensation circuit 30 of Fig. 1
30 are electrically connected at the output end that photoelectricity flow to electric pressure converter 105, and return pulse signal simultaneously exports an ambient light compensation signal.
Sampling circuit 121 may include an analog switch and a sampling storage capacitors (not shown).Sampling circuit 121 is electrically connected at photoelectricity
It is flow to the output end of electric pressure converter 105, is come from the sampling in the section of stopping (being illustrated in Fig. 2) of modulated pulsed infrared
Photoelectricity flow to the output of electric pressure converter.Sampling storage capacitors, which can be used to store photoelectricity, flow to electric pressure converter 105 when stopping
The DC voltage of area Tb, this DC voltage signal include that bias, the dark current of light perception device 104, photoelectricity flow to electric pressure converter
Voltage, environment stray light that light perception device 104 senses etc. are made up in 105 output.There is adder 122 input terminal electrically to connect
It is connected to the output end of sampling circuit 121, another input terminal is electrically connected to a fixed voltage (such as bias circuit 106 and bias
Resistance 108 export bias) and an output end be electrically connected to output control circuit 40.
Fig. 2 is painted the output timing diagram of the modulator according to an embodiment of the present invention.It is modulated in an embodiment
The duty ratio (Duty ratio) of infrared light emitting source stops shining also that is, shining in transmitting time zone Ta in the time zone Tb that stops.
Ta/Tb can be set less than 0.2, and the ratio for emitting the time zone Ta and time zone Tb that stops may be, for example, 1:8 to 1:1000, and preferably
Ground is more preferably 1:9 between 1:8 to 1:10.By the time zone Tb that stops much larger than transmitting time zone Ta, can be used compared with normal driving
Electric current (20mA) is higher, such as drives infrared light emitting source with 200mA driving current, increases optical power output and (increases photoelectricity
The signal strength of circulation photovoltage).In addition, can do environment light and dark current sampling Detection because stopping time zone Tb longer, be used to
Automatically adjust the level (lower section will be illustrated in) of comparator 107.
Output control circuit 40 is electrically connected at the output end of sension unit 20 and ambient light compensation circuit 30, output control
Circuit 40 includes comparator 107, synchronous detector 109, delay time adjustment circuit 110, output promotion grade 113 and open source output
MOS transistor 114.Comparator 107 includes two input terminals, after receiving and comparing a comparison voltage and ambient light compensation signal respectively
DC voltage, synchronous detector 109 is provided and makees synchronous detection, and measures signal by what synchronous detector 109 exported determinand
Or dendrometry signal.In this embodiment, comparison voltage is, for example, the pulse voltage that photoelectricity flow to the output of electric pressure converter 105.To
The signal that measures for surveying object is, for example, to sense the signal that human body enters sensing range, and dendrometry signal is, for example, to sense human body to leave
The signal of sensing range.
Fig. 3 is painted the adder figure according to an embodiment of the present invention.The level difference of comparator 107 represents determinand
(such as human body) real reflected signal strength, and remote human testing (such as 1.5m) can be done.Specifically, addition
The structure of device is as shown in Figure 4.Two input voltages of adder are respectively Va and Vb, and the resistance concatenated is respectively Ra and Rb,
Then adder exports
Vo isAssuming that Va is the output after sampling circuit 121 is sampled, Vb is
Bias value takes Rb/ (Ra+Rb)=0.9, then environment light influence of change 90% can react the output in adder 122, can be used to
The comparison level of micro-adjustment comparator 107, with the influence for overcoming environment light to change.The influence that environment light described in this changes,
Dark current (being influenced with variation of ambient temperature) including light perception device 104.
The output electric property of comparator 107 is connected to synchronous detector 109, and synchronous detector 109 is for example including there are two tools
Input and (AND) circuit, one input are to receive the output of comparator, and another input is the time zone signal that shines, to avoid
The influence of accidental environment light has used synchronous perception detection (Synchronized detection) principle, defeated to improve sensing
Reliability out.Synchronous detector 109 only just samples the output of comparator 107 light emitting time zone (Ta is illustrated in Fig. 2), obtains
Determinand (e.g. measure human body enter induction zone measure signal) is measured out, alternatively, determinand disappearance (e.g. measures people
Body leaves the dendrometry signal of induction zone).The output electric property of synchronous detector 109 is connected to delay time adjustment circuit 110, passes through
The delay time for measuring determinand (ON) Yu dendrometry determinand (OFF) is set separately in postponing resistance 111 and postponing resistance 112.
In the embodiment for being applied to intelligent household appliances, after can measuring determinand (such as human body), delay exports control in one second again
Signal processed, alternatively, just output control signal, such as the output of delay time adjustment circuit 110 after dendrometry determinand (such as human body)
Signal is provided to output and pushes grade 113, regulates and controls the state of intelligent household appliances.It is, for example, buffer amplifier that output, which pushes grade 113, is used to
Driving open source output mos transistor 114, provides open source grade output signal.Due to open source output mos transistor 114 have it is high resistance to
Characteristic is pressed, can be applied to output control, such as a relay is pushed to do high current and high voltage control.
Fig. 4 is painted the structure chart of the infrared human body sensing device 2 according to another embodiment of the utility model.Infrared informant
1 similarity of infrared human body sensing device of body sensing device 2 and Fig. 1, holds this and repeats no more.Infrared human body sensing device
2 include infrared emission module 10, sension unit 20, ambient light compensation circuit 32 and output control circuit 40.Output control electricity
The input terminal on road 40 includes first input end and the second input terminal, and first input end is electrically connected ambient light compensation circuit 32, with
Dc bias after receiving an ambient light compensation, as ambient light compensation signal.Second input terminal passes through 131 electricity of low-pass filter
Property connection photoelectricity flow to electric pressure converter 105, using the pulse signal that accepts filter as comparison voltage.
In this embodiment, ambient light compensation circuit 32 further includes low-pass filter 132 and is electrically connected at adder 122
Output end filtering out HF noise signal, then is exported to output control circuit 40.In addition, light perception unit 20 and output are controlled
Between circuit 40 processed, more electric connection low-pass filter 131.After photoelectricity flow to the output of electric pressure converter 105, low pass is also first passed through
Filter 131 filters out HF noise signal, then exports to output control circuit 40.Low-pass filter 131 and low-pass filter 132
Photoelectric current conducting moment, the momentary pulse signal of generation can be filtered out.
Output control circuit 40 is electrically connected at the output end of sension unit 20 and ambient light compensation circuit 30, connects respectively
Synchronous detection after a comparison voltage and an ambient light compensation signal is received and compares, and export determinand measures signal or dendrometry letter
Number.In this embodiment, comparison voltage is, for example, after photoelectricity flow to the output of electric pressure converter 105, and low-pass filtered device 131 filters out
The pulse voltage of HF noise signal.Ambient light compensation signal is, for example, the output for passing through the adder 122 such as Fig. 1, then through low
Bandpass filter 132 filters out comparison level of the HF noise signal to micro-adjustment comparator 107, the shadow that drop low ambient light changes
It rings.
Fig. 5 is painted the structure chart of the infrared human body sensing device 3 according to another embodiment of the utility model, can be with
100% eliminates the influence that environment light changes.Infrared human body sensing device 3 it is similar to the infrared human body sensing device 1 of Fig. 1 it
Place, holds this and repeats no more.Infrared human body sensing device 3 includes infrared emission module 10, sension unit 20, ambient light compensation
Circuit 34 and output control circuit 40.
In this embodiment, ambient light compensation circuit 34 includes sampling circuit 121, phase inverter 123, adder 124, second level
Amplifier 125 and low-pass filter 126.Sampling circuit 121 is electrically connected and is controlled by modulator 101, in modulated
The interval sampling that stops of pulsed infrared, and output sampling signal.The output end of the electric connection sampling circuit 121 of phase inverter 123
With acceptance sampling signal, and an inversion signal is exported, this inversion signal is that photoelectricity flow to electric pressure converter 105 in the time zone Tb that stops
The DC voltage noise signal sampled.Phase inverter 123 is electrically connected in adder 124 and photoelectricity flow to electric pressure converter
105, to receive the pulse signal of inversion signal and modulated pulsed infrared, and export a sum signal, this sum signal
To eliminate DC voltage noise signal.In other words, the output of sampling circuit 121 is after phase inverter 123, in adder 124
It is added, the direct current output of adder 124, which can be returned to bias circuit 106 and be supplied to photoelectricity, flow to electric pressure converter 105
Bias value.When reflection light pulse comes, the direct current signal of environment light is reduced.
Adder 124 is electrically connected at by two-stage amplifier 125 to receive sum signal, and exports an amplified signal,
Two-stage amplifier 125 can react the signal of actual infrared light reflection determinand.And it is electrically connected by low-pass filter 126
In two-stage amplifier 125 and output control circuit 40, the output of two-stage amplifier 125 can low-pass filtered device 126 export after again
Export the momentary pulse signal (high-frequency noise that current lead-through and breaking moment are filtered out to the comparator 107 of output control circuit 40
Signal).
Output control circuit 40 is electrically connected at the output end of sension unit 20 and ambient light compensation circuit 34, connects respectively
Synchronous detection after a comparison voltage and an ambient light compensation signal is received and compares, and export determinand measures signal or dendrometry letter
Number.In this embodiment, output control circuit 40 includes first input end and one second input terminal, and first input end is electrically connected
Ambient light compensation circuit 34, to receive the secondary amplification pulse signal through environment light DC compensation, and the second input terminal electrically connects
Bias circuit 106 is connect, to receive preset threshold threshold voltage.Preset threshold threshold voltage can be according to bias circuit 106, bias resistance
Parameter designing between 108 and+V.It is, for example, preset threshold threshold voltage in the comparison voltage of this embodiment, compares to micro-adjustment
The comparison level of device 107, for adjusting the setting (sensitivity determinating) of sensing distance.
Output control circuit 40 includes that comparator 107, synchronous detector 109, delay time adjustment circuit 110 and output push away
Dynamic circuit 113 and open source output mos transistor 114.Comparator 107 is electrically connected at 108 structure of bias resistance of bias circuit 106
At preset threshold threshold voltage and ambient light compensation circuit 34, receive respectively containing determinand reflection signal pulse signal and direct current
Bias.Synchronous detector 109, is electrically connected the output end and modulator 101 of comparator 107, in infrared light emitting source 103
The section Ta that shines is sampled and is exported sampled signal.Delay time adjustment circuit 110 is electrically connected at the output of synchronous detector 109
End, and including first resistor 111 and second resistance 112, it can be adjusted separately after determinand measures and be exported by the design of resistance value
Measure signal delay time, and adjust the determinand and disappear exported dendrometry signal delay time.Output pushes circuit 113
It is electrically connected at the output end of delay time adjustment circuit 110, measures signal delay time and the dendrometry signal delay according to this
Time provides an open source grade output signal.
The infrared emission module of the utility model includes a modulator, for distinguishing the transmitting of light emitting diode and stopping
Only.Light emitting diode is, for example, high power infrared light-emitting diode, increases photoemissive output by large driven current density, and
Modulation (modulate) lesser transmitting (conducting) and (closing) time scale (duty ratio) of stopping, so that transmitting (conducting) time
Shorter, (closing) time of stopping is longer, it can compare normal drive current (such as 20mA) higher drive current (such as
200mA) drive.Environment light and dark current are then detected in closing time of (stopping), automatically adjusts the level of comparator accordingly, is reduced
The interference of environment light and dark current can automatically adjust the level of comparator, so that comparator level difference is closer to determinand (example
Such as human body) signal strength of reflection, achieve the effect that the human testing of remote (about 1.5m).In addition, passing through synchronous perception inspection
Surveying (Synchronized detection) principle reduces the influence of accidental environment light, improves the reliability of sensing output.
The automatic environmental light compensation circuit of the utility model detects environment light using the photoemissive stop time, provides defeated
Level is compared in control circuit adjustment out, and after reducing this direct current level automatically accordingly, it is reflected just to amplify determinand (human body)
Signal, therefore be able to reliably detect remote human body reflection signal, reach can sense determinand often sensing target.
Embodiment described above is only the technical idea and feature to illustrate the utility model, and purpose makes to be familiar with this
The personage of skill can understand the content of the utility model and implement accordingly, when cannot with restriction the utility model patent
Range should cover according to equivalent change or modification made by the revealed spirit of the utility model in the utility model generally
The scope of the patents in.
Claims (10)
1. a kind of infrared sensing device characterized by comprising
One infrared emission module, including a modulator and an infrared light emitting source, to provide a modulated pulsed infrared；
One sension unit receives the modulated pulsed infrared by the reflected pulsed optical signals of a determinand, comprising:
One light perception device to perceive an infrared signal and an ambient light signal, and converts one photo-signal of output,
In the infrared signal be reflection light of the modulated pulsed infrared via the determinand；
One photoelectricity flow to electric pressure converter, is electrically connected at the light perception device, receives the photo-signal and is converted into a pulse
Signal；
One ambient light compensation circuit is electrically connected at the output end that the photoelectricity flow to electric pressure converter, receives the pulse signal simultaneously
Export an ambient light compensation signal；
One output control circuit, is electrically connected at the output end of the sension unit and the ambient light compensation circuit, receives respectively simultaneously
Compare synchronous detection after a comparison voltage and the ambient light compensation signal, and export the determinand measures signal or dendrometry letter
Number, wherein the comparison voltage is related with the pulse signal or a preset threshold threshold voltage.
2. infrared sensing device according to claim 1, which is characterized in that the infrared emission module further includes a light
Emit driver, be electrically connected at the modulator and the infrared light emitting source, is when exported electric current by modulator adjustment duty,
To drive the infrared light emitting source, wherein duty ratio is between 0.001 to 0.2.
3. infrared sensing device according to claim 1, which is characterized in that the ambient light compensation circuit includes a sampling
Circuit is electrically connected at the output end that the photoelectricity flow to electric pressure converter, in the area of stopping of the modulated pulsed infrared
Between sampling the output of electric pressure converter is flow to from the photoelectricity.
4. infrared sensing device according to claim 1, which is characterized in that the ambient light compensation circuit includes:
One sampling circuit connects and is controlled by the output end of the modulator；And
One adder, the output end of the sampling circuit is electrically connected to an input terminal, and an another input terminal is electrically connected to
The preset threshold threshold voltage and an output end are electrically connected the output control circuit.
5. infrared sensing device according to claim 4, which is characterized in that the output end of the adder is electrically connected to
One first low-pass filter is electrically connected the output control circuit by first low-pass filter again.
6. infrared sensing device according to claim 1, which is characterized in that the photoelectricity flow to electric pressure converter and electrically connects
One second low-pass filter is connect, and the output control circuit is electrically connected to by second low-pass filter.
7. infrared sensing device according to claim 1, which is characterized in that the ambient light compensation circuit includes:
One sampling circuit is electrically connected and is controlled by the modulator, is taken out with the section of stopping in the modulated pulsed infrared
Sample, and export a sampled signal；
One phase inverter is electrically connected the output end of the sampling circuit to receive the sampled signal, and exports an inversion signal；
One adder, is electrically connected the phase inverter and photoelectricity flow to electric pressure converter, to receive the inversion signal and the arteries and veins
Signal is rushed, and exports a sum signal；
One two-stage amplifier is electrically connected at the adder to receive the sum signal, and exports an amplified signal；And
One third low-pass filter is electrically connected at the two-stage amplifier and the output control circuit, to provide a filtering signal.
8. infrared sensing device according to claim 4, which is characterized in that the input terminal of the output control circuit includes
One first input end and one second input terminal, in which:
The first input end is electrically connected the ambient light compensation circuit, to receive the Dc bias after an ambient light compensation, as
The ambient light compensation signal；And
Second input terminal is electrically connected the photoelectricity by one second low-pass filter and flow to electric pressure converter, to receive a filtering
Pulse signal is as the comparison voltage.
9. infrared sensing device according to claim 7, which is characterized in that the input terminal of the output control circuit includes
One first input end and one second input terminal, in which:
The first input end is electrically connected the ambient light compensation circuit, to receive one or two amplification arteries and veins through environment light DC compensation
Signal is rushed, and
Second input terminal is electrically connected a bias circuit, to receive the preset threshold threshold voltage.
10. infrared sensing device according to claim 1, which is characterized in that the output control circuit includes:
One comparator, there is an input terminal to receive a Dc bias, and an another input terminal receives the pulse signal；
One synchronous detector, is electrically connected the output end and the modulator of the comparator, with shining in the infrared light emitting source
Section sampling, and export a sampled signal；
One delay time adjustment circuit is electrically connected at the output end of the synchronization detector, including a first resistor and one second
Resistance adjusts separately the determinand and measures the signal delay time that measures exported afterwards, and adjust the determinand disappear institute it is defeated
Dendrometry signal delay time out；And
One output pushes circuit, the output end of the delay time adjustment circuit is electrically connected at, when measuring signal delay according to this
Between and the dendrometry signal delay time, an open source grade output signal is provided.
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| CN201821644002.4U CN209148884U (en) | 2018-10-09 | 2018-10-09 | Infrared sensing device |
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| CN111025416A (en) * | 2018-10-09 | 2020-04-17 | 众智光电科技股份有限公司 | Infrared sensing device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111025416A (en) * | 2018-10-09 | 2020-04-17 | 众智光电科技股份有限公司 | Infrared sensing device |
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