CN106680888B - A kind of drop optical detection apparatus - Google Patents
A kind of drop optical detection apparatus Download PDFInfo
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- CN106680888B CN106680888B CN201710063769.1A CN201710063769A CN106680888B CN 106680888 B CN106680888 B CN 106680888B CN 201710063769 A CN201710063769 A CN 201710063769A CN 106680888 B CN106680888 B CN 106680888B
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- drop
- photodetector
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- laser
- transparent
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V8/00—Prospecting or detecting by optical means
- G01V8/10—Detecting, e.g. by using light barriers
- G01V8/20—Detecting, e.g. by using light barriers using multiple transmitters or receivers
Abstract
The present invention proposes a kind of drop optical detection apparatus, including laser, Laser Modulation power supply, opaque drop photodetector, transparent drop photodetector and detectable signal processing equipment, Laser Modulation power supply is connected to laser, opaque drop photodetector is on the output light path of laser, transparent drop photodetector is arranged side by side with opaque drop photodetector, and the surface in opaque drop photodetector, opaque drop photodetector and transparent drop photodetector are all connected to detectable signal processing equipment.The present invention is by using optical detecting method, realize the dynamic contact-free detection to drop, it ensure that detection process will not pollute drop to be measured, using single light source double detector, the stability of drop detection is improved, and transparent drop and opaque drop can be detected simultaneously, improves the drop detection scope of application, influence of the ambient light to drop detection is additionally effectively prevented, is had broad application prospects.
Description
Technical field
The present invention relates to drop detection technical fields, and in particular to a kind of drop optical detection apparatus.
Background technology
Liquid drop speed detection has extensive utilization in medicine, chemical industry, agriculture dispenser etc..The micrometeor detection of liquid uses
More is drop method, and the flow velocity of liquid is determined by being counted with unit interval drop.Currently, most hospitals are to disease
Transfusion state is manually observed by patient or nurse when people carries out venous transfusion, and patient need to pay attention to whether just being dripped under drop at any time
Often, whether drop has dripped off, and nurse's processing is reinformed if noting abnormalities.For handicapped elderly patients and there are many
The infusion hall that patient is infused simultaneously, nurse would have to take much time at every moment pays close attention to transfusion state with energy.
There is sub-fraction hospital to use electronic infusion monitoring arrangement, but many devices can only detect the presence or absence of liquid medicine, and can not detect
" running needle ", infusion are too fast or too slow etc. abnormal.In addition, in fields such as chemical industry, pharmacy, many detections to drop are used and are connect
Touch measures, but the problems such as these measurement methods often bring pollution, and also some detectors are using photoelectric method detection, but
It is that can only detect transparent drop, or opaque drop can only be detected.
Invention content
The present invention is based on above-mentioned prior art problem, a kind of drop optical detection apparatus of proposition of innovation, by using light
Detection method is learned, the dynamic contact-free detection to drop is realized, ensures that detection process will not pollute drop to be measured, uses simultaneously
Single light source double detector is not only increased the stability of drop detection, and is carried out in real time to drop based on optical non-contact
Detection can detect the lower drop-wise state of drop simultaneously no matter drop is transparent or opaque, improve drop inspection
Survey the scope of application, in addition by by Laser modulation at quasi-continuous output mode, and before the detectors end install additional optical filter, have
Effect ground solve influence of the ambient light to drop detection, can be widely applied to medical treatment assist infusion monitoring, pharmacy and wine brewing,
The real-time detection of various transparent, the opaque drops in the fields such as petrochemical industry, environmental protection.
It is as follows that the present invention solves the technical solution that above-mentioned technical problem is taken：
A kind of drop optical detection apparatus, including：Laser 1, Laser Modulation power supply 3, opaque drop photodetector
5, transparent drop photodetector 6 and detectable signal processing equipment 7, the Laser Modulation power supply 3 are connected to the laser 1,
The opaque drop photodetector 5 is on the output light path of the laser 1, the transparent drop photodetector 6
It is arranged side by side with the opaque drop photodetector 5, and the surface in the opaque drop photodetector 5,
The opaque drop photodetector 5 and transparent drop photodetector 6 are all connected to the detectable signal processing equipment 7；
Drop channel 2 is between the laser 1 and photodetector, when there is no drop by drop channel 2, laser 1
Output beam is only irradiated to the opaque drop photodetector 5；When transparent drop is by drop channel 2, laser 1
Output beam can be irradiated to the opaque drop photodetector 5 and transparent drop photoelectricity simultaneously after being reflected by transparent drop
Detector 6；When opaque drop is by drop channel 2, the output beam of laser 1 can not be shone by opaque liquid droplets intercept
It is mapped to the opaque drop photodetector 5 and transparent drop photodetector 6.
Further drop optical detection apparatus according to the present invention, wherein further including having diverging prism 4, the hair
It dissipates prism 4 to be set on the output light path of the laser 1, the laser that laser 1 can be exported by the diverging prism 4
Misconvergence of beams is linear type Line beam, and the Line beam after diverging will not be irradiated to the transparent drop photodetector 6.
Further drop optical detection apparatus according to the present invention, wherein the opaque transparent liquid drips photodetector
5 and transparent drop photodetector 6 be the detector based on photodiode, and the opaque drop photodetector 5
In photodiode connected with the photodiode differential concatenation in the transparent drop photodetector 6.
Further drop optical detection apparatus according to the present invention, wherein the opaque transparent liquid drips photodetector
5 include the first photodiode and first resistor, and the transparent drop photodetector 6 includes the second photodiode and second
The negative pole end of resistance, second photodiode is connected to voltage source, and the positive terminal of second photodiode is connected to
One end of the second resistance, the other end ground connection of the second resistance, the positive terminal in second photodiode and institute
State the detectable signal output end that the transparent drop photodetector 6 is drawn between second resistance；First photodiode
Positive terminal ground connection, the negative pole end of first photodiode is connected to one end of the first resistor, the first resistor
The other end be connected to the voltage source, draw institute between the negative pole end and the first resistor of first photodiode
The detectable signal output end of opaque drop photodetector 5 is stated, first photodiode and the second photodiode exist
It receives in the conduction state when the output beam of laser.
Further drop optical detection apparatus according to the present invention, wherein when not having drop to reach swashing for laser
When light irradiation area, the opaque drop photodetector 5 and transparent drop photodetector 6 export low level signal；
When transparent liquid is dripped to up to the laser-irradiated domain of laser, the opaque output of drop photodetector 5 low level signal,
The transparent drop photodetector 6 exports high level signal；When opaque transparent liquid is dripped to up to the laser-irradiated domain of laser,
The opaque drop photodetector 5 exports high level signal, the transparent drop photodetector 6 exports low level letter
Number.
Further drop optical detection apparatus according to the present invention, wherein the detectable signal processing equipment 7 is wrapped
Signal amplifier 12, narrow band filter 13, envelope detector 14, waveform shaper 15 and microprocessor 16 are included, the signal is put
Big device 12 is connected to the detectable signal output end of the photodetector, and the output end of the signal amplifier 12 is connected to described
The output end of narrow band filter 13, the narrow band filter 13 is connected to the envelope detector 14, the envelope detector 14
Output end be connected to the waveform shaper 15, the output end of the waveform shaper 15 is connected to the microprocessor 16.
Further drop optical detection apparatus according to the present invention, wherein the detectable signal processing equipment 7 is wrapped
Include the first signal amplifier, the first narrow band filter, the first envelope detector, first waveform reshaper, second signal amplifier,
Second narrow band filter, the second envelope detector, the second waveform shaper and the microprocessor, the first signal amplification
Device, the first narrow band filter, the first envelope detector, first waveform reshaper and the microprocessor are sequentially connected, for locating
The detectable signal of opaque drop photodetector 5 is managed, and first signal amplifier is connected to the opaque drop light
The detectable signal output end of electric explorer 5；The second signal amplifier, the second narrow band filter, the second envelope detector,
Two waveform shapers and the microprocessor are sequentially connected, the detectable signal for handling transparent drop photodetector 6, and institute
State the detectable signal output end that second signal amplifier is connected to the transparent drop photodetector 6.
Further drop optical detection apparatus according to the present invention, wherein the microprocessor can be based on photoelectricity
The drop detectable signal of detector output calculates drips frequency under drop, and can determine whether drop speed deviates preset under drop
Whether critical field and drop stop to drip, while can externally export drop abnormal control signal.
Further drop optical detection apparatus according to the present invention, wherein further include have spike filter 10 and/
Or alert device 8, the spike filter 10 are respectively arranged at the opaque drop photodetector 5 and transparent drop photoelectricity
The detection window of detector 6, and the centre wavelength that the band-pass wavelength of the spike filter 10 is the laser；The prompting
Equipment 8 is connected to the detectable signal processing equipment 7, and includes alarm and/or state display lamp 17.
Further drop optical detection apparatus according to the present invention, wherein wavelength exists centered on the laser 1
The laser 1 is modulated into 10KHz's by 635nm, the semiconductor laser that mean power is 2mW, the Laser Modulation power supply 3
Quasi-continuous lasing exports, and the band-pass wavelength of the spike filter is 635nm, and the centre frequency of the narrow band filter 13 is
10KHz, the diverging prism 4 are Bao Weier prism.
Technical scheme of the present invention has the characteristics that following technological innovation and technique effect：
1), the present invention using optical method detection drop lower drop, when drop in the optical path by when, due to liquid
The refraction or absorption of drop, can cause the luminous intensity being irradiated on detector to change, and the signal of detector output can also occur
Variation, signal processing circuit can judge the lower drop of drop according to the variation of detector output signal.
2), for the transparent and opaque property of drop, present invention employs 1 laser light source and 2 photodetectors,
Transparency liquid and opaque liquid are separately detected by two photodetectors.The detector for wherein detecting opaque drop faces
Lasing light emitter, when there is opaque drop to pass perpendicularly through the space among this detector and laser, laser irradiation on this detector
Intensity is remarkably decreased, and can export a high level pulse；Another photodetector is installed on the top of this detector, does not have
Laser will not directly strike when drop, and form a convex lens in space due to drop when there is transparent drop, by laser
Directional light convergence after diverge again, just have laser at this time and shine this another detector so that another detector output
One high level pulse, and then will separately detect transparent drop and opaque drop by the two detectors.
3), the laser in the present invention as probe source is semiconductor laser, and output wavelength is the feux rouges of 635nm,
Power 2mW, due to the absorption of drop or refraction action when drop passes through, the scattering light of surrounding also can there are one shake, Ke Yiqi
To the effect of user's prompt to surrounding.
4), laser output window of the present invention is equipped with Bao Weier prism, output be not point light source but at
One-shaped linear light source, ensure that can also be shone when drop drop is inclined by laser, improve detectability.
5), laser is modulated into the quasi-continuous output of 10KHz at work in the present invention, and detector receives laser letter
The narrow band filter that the amplified feeding centre frequency of electric signal is 10KHz is exported after number, which declines to the signal of 10KHz
Subtract very little, and it is very big to decay for the signal of other frequencies, can filter out the stray lights such as the light except laser, substantially increase
The interference free performance of drop detection.
6), two detector windows are assembled with optical filter, which only allows the 635nm wavelength that laser is sent out
Light passes through, and can be sponged to the stray light of other wavelength, further avoids influence of the stray light to detector.
7), the signal that detector exports in the present invention is sent into envelope detection circuit after amplification, filtering, obtains drop
Electric impulse signal when passing through is sent into signal processing circuit using shaping pulse.Signal processing circuit is by a microprocessor
Composition can calculate the time interval between adjacent 2 drops, so as to obtain by the two paths of signals processing to feeding
The frequency dripped under drop, and then can analyze and drip whether speed is faster than some numerical value set under drop, or be slower than some and set
Fixed numerical value, can also judge whether drop stops to drip, and carry out indicating reminders with different light emitting diodes to different situations, real
The detection of drop multi-motion state is showed, processor can also be logical by serial ports (USART) and miscellaneous equipment or device in addition
Letter, miscellaneous equipment or device are transmitted to by drop-wise state under drop.
8) it is that a kind of nothing connects, in short, drop optical detection apparatus of the present invention detects drop using optical means
Drop detection method is touched, any pollution will not be caused to liquid, and can be achieved at the same time to transparent drop and opaque drop
Detection, and accuracy of detection is higher, the scope of application is very wide, for example device of the present invention is applied to infusion monitoring, it can not only be real
When detection drop whether dripped off, and dynamic instrumentation can be carried out to transfusion state, when accidents such as generations " run about needle "
When drop being caused to stop drop, can also be real-time detected and provide alarm signal by detection device, and when drop drip too soon or
When too slow, warning device can be also triggered, nurse is reminded to come to dispose, therefore drop optical detection apparatus of the present invention has extensively
Wealthy marketing application prospect and practical value.
Description of the drawings
Fig. 1 is the overall structure diagram of drop optical detection apparatus of the present invention.
Fig. 2 is the electrical block diagram of drop optical detection apparatus of the present invention.
It is " one " word that Fig. 3, which is that Laser Output Beam is dissipated by diverging prism in drop optical detection apparatus of the present invention,
The schematic diagram of shape threadiness hot spot.
When Fig. 4 is using drop optical detection apparatus of the present invention, transparent drop swashs when not reaching laser-irradiated domain
Light irradiates the output schematic diagram of the case where each detector and each detector.
When Fig. 5 is using drop optical detection apparatus of the present invention, transparent liquid is dripped to up to laser when laser-irradiated domain
The output schematic diagram of the case where irradiating each detector and each detector.
When Fig. 6 is using drop optical detection apparatus of the present invention, when opaque drop does not reach laser-irradiated domain
The output schematic diagram of the case where each detector of laser irradiation and each detector.
When Fig. 7 is using drop optical detection apparatus of the present invention, opaque transparent liquid is dripped to swash up to when laser-irradiated domain
Light irradiates the output schematic diagram of the case where each detector and each detector.
The meaning of each reference numeral is as follows in figure：
1- lasers, 2- drops channel, 3- Laser Modulation power supplys, 4- diverging prisms, the opaque drop photodetectors of 5-,
The transparent drop photodetectors of 6-, 7- detectable signal processing equipments, 8- alert devices, 9- drops, 10- spike filters, 11- bases
Plate, 12- signal amplifiers, 13- narrow band filters, 14- envelope detectors, 15- waveform shapers, 16- microprocessors, 17- shapes
State display lamp, 18- communication interfaces.
Specific implementation mode
Technical scheme of the present invention is described in detail below in conjunction with attached drawing, so that those skilled in the art can be more
The protection domain for adding and being clearly understood from the present invention, but be not intended to limit the present invention.
Drop optical detection apparatus of the present invention is as shown in Fig. 1, including laser 1, Laser Modulation power supply 3,
Diverging prism 4, opaque drop photodetector 5, transparent drop photodetector 6, detectable signal processing equipment 7 and prompting are set
Standby 8, all parts can be fixed on same substrate 11, and substrate is installed on to the perpendicular carried out residing for drop to be detected
It is interior.The Laser Modulation power supply 3 is connected to the laser 1, for providing working power to laser and realizing power modulation,
Laser is modulated into the quasi-continuous output of 10KHz when work.The laser 1 is used as probe source, preferred use partly to lead
Body laser, output wavelength are the feux rouges of 635nm, power 2mW, due to the absorption of drop or refraction action, meeting when drop passes through
Scattering light around so that also can play the role of user's prompt to surrounding there are one shake.In the defeated of laser
Light extraction road is disposed with the diverging prism 4 and opaque drop photodetector 5, and the opaque drop photoelectricity is visited
It surveys device 5 to be on same linear light path with the diverging prism 4, opaque drop photodetector 5 is being in diverging prism 4 just
Rear, the transparent drop photodetector 6 are close to be arranged side by side with the opaque drop photodetector 5, and are in institute
State the surface of opaque drop photodetector 5.The diverging prism 4 is preferably Bao Weier prism, passes through the diverging
The laser-beam divergence that prism 4 exports laser is linear type linear light source, as shown in Fig. 3, and is sent out through the diverging prism 4
The entire incidence surface of linear light source after the dissipating full opaque drop photodetector of irradiation 5 just, at the same will not divergent irradiation to saturating
Bright drop photodetector 6, in this way by installing Bao Weier prism in laser output window, make laser output is not a little
Light source but linear light source are not only able to ensure when no drop laser by diverging prism only direct irradiation opaque
On drop photodetector, without being irradiated on the transparent drop photodetector being positioned above, and drop ensure that
It can be also irradiated with a laser when dripping inclined, improve detectability.It is further preferred in the opaque drop photodetector 5
It is fitted with spike filter 10 on the detection window of transparent drop photodetector 6, which only allows laser
The 635nm centre wavelength light sent out passes through, and can then be sponged to the stray light of other wavelength, further avoids stray light pair
The influence of detector.The transparent drop photodetector 6 is all connected to the spy with the opaque drop photodetector 5
Signal handling equipment 7 is surveyed, the alert device 8 is connected to the detectable signal processing equipment 7, the detectable signal processing equipment
The detectable signal that 7 pairs of transparent drop photodetectors 6 are inputted with opaque drop photodetector 5 is handled, and then is judged
The drop detected is transparent drop or opaque drop, and can handle to obtain the drippage state of drop, including drop simultaneously
Whether terminal-velocity degree the information such as has dripped off, and has sent out enabling signal to the alert device 8 when judgement drippage is abnormal, by institute
It states alert device 8 and carries out drips abnormal state prompting.
Further circuit composed structure as shown in Fig. 2, the opaque drop photodetector 5 and transparent liquid
Drop photodetector 6 is the detector based on photodiode, and differential concatenation connects.The specific opaque drop light
Electric explorer 5 includes the first photodiode and first resistor, and the transparent drop photodetector 6 includes two pole of the second photoelectricity
Pipe and second resistance, the photodiode in the conduction state, second photodiode when receiving light beam irradiation
It is connect with the first photodiode differential concatenation, the negative pole end of specific second photodiode is connected to voltage source
The positive terminal of VCC, second photodiode are connected to one end of the second resistance, and the other end of the second resistance is
Low level end (preferably grounded) draws transparent drop between the positive terminal and the second resistance of second photodiode
The detectable signal output end of photodetector；The positive terminal of first photodiode is connected to low level end and (preferably connects
Ground), the negative pole end of first photodiode is connected to one end of the first resistor, and the other end of the first resistor connects
It is connected to the voltage source VCC, opaque transparent liquid is drawn between the negative pole end and the first resistor of first photodiode
Drip the detectable signal output end of photodetector.The detectable signal processing equipment includes being visited for handling opaque drop photoelectricity
The first signal amplifier, the first narrow band filter, the first envelope detector and the first waveform reshaper for surveying device output signal, with
And second signal amplifier, the second narrow band filter, the second envelope for handling transparent drop photodetector output signal
Wave detector and the second waveform shaper and microprocessor 16.The detectable signal of the opaque drop photodetector 5 exports
End is connected to first signal amplifier, and the output end of first signal amplifier is connected to first narrow-band filtering
The output end of device, first narrow band filter is connected to the first envelope detector, the output end of first envelope detector
It is connected to first waveform reshaper, the output end of the first waveform reshaper is connected to the microprocessor 16；It is described transparent
The detectable signal output end of drop photodetector 6 is connected to the second signal amplifier, the second signal amplifier
Output end is connected to second narrow band filter, and the output end of second narrow band filter is connected to the second envelope detection
The output end of device, second envelope detector is connected to the second waveform shaper, the output end of second waveform shaper
It is connected to the microprocessor 16.Opaque drop photodetector 5 or transparent drop photodetector 6 receive laser signal
Electric signal is exported afterwards to signal amplifier 12, and the narrow band filter 13 that centre frequency is 10KHz, the narrowband are sent into after its amplification
Filter 13 decays very little to the signal of 10KHz, and it is very big to decay for the signal of other frequencies, thus can filter out laser it
The stray lights such as outer light substantially increase the interference free performance of drop detection, while after the filtering of narrow band filter 13
Signal is sent into envelope detector 14 and obtains electric impulse signal when drop passes through, and it is whole to carry out electric pulse using waveform shaper 15
Shape, the signal after shaping are sent into microprocessor 16.Using two groups of signal amplifiers, narrow band filter, envelope detector and waveform
Reshaper independently handles the detectable signal that opaque drop photodetector and transparent drop photodetector provide, not only
The interference free performance of drop detection is improved, and ensure that drop detection precision.The microprocessor passes through the liquid to feeding
Drop detectable signal is handled, and can calculate the time interval between two neighboring drop, so as to obtain under drop
The frequency of drop, and then can analyze and drip whether speed is faster than some numerical value set under drop, or it is slower than number of some setting
Value, can also judge whether drop stops to drip, and different situations are generated with different alerting signals, realize drop multi-motion shape
The detection of state is reminded, wherein the alert device includes preferably alarm and state display lamp 17, such microprocessor energy
It is enough to drive different state display lamps to carry out indicating reminders based on different drop detection situations.The microprocessor 16 is gone back simultaneously
It is provided with communication interface 18, is communicated with miscellaneous equipment or device with realizing, drop-wise state under drop is transmitted to miscellaneous equipment or device.
Finally illustrate the operation principle of drop optical detection apparatus of the present invention or worked in conjunction with attached drawing 4 to attached drawing 7
Journey：
As shown in Fig. 4, when transparent drop passes through drop channel 2, when drop does not reach laser-irradiated domain, laser
The laser beam that device 1 is sent out only is irradiated on the opaque drop photodetector 5 of face, in combination with attached drawing 2, opaque drop
Photodiode in photodetector 5 is connected under light illumination, and opaque drop photodetector 5 is to detectable signal processing equipment
Low level signal is exported, while due to there is no laser irradiation, transparent drop photodetector 6 on transparent drop photodetector 6
In photodiode disconnected under no light, transparent drop photodetector 6 to detectable signal processing equipment export low level
Signal, to judge that no drop passes through laser irradiation detecting area when detectable signal processing equipment receives only low level signal
Domain.
As shown in Fig. 5, when there is transparent drop to pass through drop channel 2, when drop reaches laser-irradiated domain, laser
The laser beam that device 1 is sent out is irradiated on transparent drop 9, and transparent drop is equivalent to an optical lens at this time, is played to laser beam
Anaclasis effect so that critical dimensions quickly again after laser is focused, under the refraction disperse function of transparent drop, such as
Attached shown in fig. 5, laser beam has been irradiated to opaque drop photodetector 5 and transparent drop photodetector 6 simultaneously at this time
Detection window, in combination with attached drawing 2, the photodiode in opaque drop photodetector 5 continues under light illumination at this time
Conducting, opaque drop photodetector 5 export low level signal, while transparent drop light at this time to detectable signal processing equipment
Photodiode in electric explorer 6 continues to be connected under light illumination, and transparent drop photodetector 6 is to detectable signal processing equipment
High level signal is exported, to receive the letter of the high level from transparent drop photodetector 6 when detectable signal processing equipment
Number when judgement have transparent drop by laser irradiation search coverage at this time, further when drop drips to below laser-irradiated domain
When, the irradiation laser on transparent drop photodetector 6 can disappear again, restore low level signal output again.
As shown in Fig. 6, when opaque drop passes through drop channel 2, when opaque drop does not reach laser irradiation area
When domain, the laser beam that laser 1 is sent out only is irradiated on the opaque drop photodetector 5 of face, in combination with attached drawing 2,
Photodiode in opaque drop photodetector 5 is connected under light illumination, and opaque drop photodetector 5 is believed to detection
Number processing equipment exports low level signal, while due to not having laser irradiation, transparent drop light on transparent drop photodetector 6
Photodiode in electric explorer 6 disconnects under no light, and transparent drop photodetector 6 is defeated to detectable signal processing equipment
Go out low level signal, to judge that no drop is shone by laser when detectable signal processing equipment receives only low level signal
Penetrate search coverage.
As shown in Fig. 7, when there is opaque drop to pass through drop channel 2, when opaque transparent liquid is dripped to up to laser irradiation area
When domain, the laser beam that laser 1 is sent out is irradiated on opaque drop and is stopped by opaque drop absorption, due to opaque transparent liquid
Drop blocks the light path in laser illumination to opaque drop photodetector 5 so that opaque drop photodetection at this time
There is no light beam irradiation, photodiode therein to be disconnected under no light on device 5, to opaque drop photodetector 5 this
When to detectable signal processing equipment export high level signal；Simultaneously at this time on transparent drop photodetector 6 due to there is no laser
Irradiation, photodiode therein continues to disconnect under no light, and transparent drop photodetector 6 is to detectable signal processing equipment
Low level signal is exported, to receive the high level from opaque drop photodetector 5 when detectable signal processing equipment
Judgement has opaque drop by laser irradiation search coverage at this time when signal, further when drop drips to laser-irradiated domain
When lower section, the irradiation laser on opaque drop photodetector 5 can restore again, it is made to restore low level signal output again.
It can be seen that the present invention using optical method detection drop lower drop, when drop in the optical path by when, due to
The refraction of drop or absorption can cause the luminous intensity being irradiated on different detectors to change, and then cause detector
The variation of output signal, detectable signal processing equipment can be judged transparent, opaque according to the variation of detector output signal
The lower drop of drop, while the detectable signal processing equipment can calculate the time interval between two neighboring drop, to
The frequency dripped under drop can be obtained, and then can analyze and drip the numerical value whether speed is faster than some setting under drop, or is slow
In the numerical value of some setting, it can also judge whether drop stops to drip, and different situations are generated with different alerting signals, realize
The detection of drop multi-motion state is reminded.
It the above is only and the preferred embodiment of the present invention is described, technical scheme of the present invention is not limited to
This, those skilled in the art on the basis of the design of the major technique of the present invention made by any known deformation belong to the present invention
Claimed technology scope, the specific protection domain of the present invention are subject to the record of claims.
Claims (8)
1. a kind of drop optical detection apparatus, which is characterized in that including：Laser（1）, Laser Modulation power supply（3）, opaque transparent liquid
Drip photodetector（5）, transparent drop photodetector（6）With detectable signal processing equipment（7）, the Laser Modulation power supply
（3）It is connected to the laser（1）, the opaque drop photodetector（5）In the laser（1）Output light path
On, the transparent drop photodetector（6）With the opaque drop photodetector（5）It is arranged side by side, and in described
Opaque drop photodetector（5）Surface, the opaque drop photodetector（5）With transparent drop photodetection
Device（6）It is all connected to the detectable signal processing equipment（7）；Drop channel（2）In the laser（1）With photodetector
Between, pass through drop channel when there is no drop（2）When, laser（1）Output beam be only irradiated to the opaque drop light
Electric explorer（5）；When transparent drop passes through drop channel（2）When, laser（1）Output beam by transparent drop reflect after energy
Enough while being irradiated to the opaque drop photodetector（5）With transparent drop photodetector（6）；When opaque drop is logical
Cross drop channel（2）When, laser（1）Output beam the opaque drop can not be irradiated to by opaque liquid droplets intercept
Photodetector（5）With transparent drop photodetector（6）；The detectable signal processing equipment（7）Including microprocessor（16）,
The drop detectable signal that the microprocessor can be exported based on photodetector calculates drips frequency under drop, and can determine liquid
Whether speed of dripping deviates preset critical field and whether drop stops to drip, while can externally export drop exception control
Signal.
2. drop optical detection apparatus according to claim 1, which is characterized in that further include having diverging prism（4）, described
Dissipate prism（4）It is set to the laser（1）Output light path on, pass through the diverging prism（4）It can be by laser（1）
The laser-beam divergence of output is linear type Line beam, and the Line beam after diverging will not be irradiated to the transparent drop photodetection
Device（6）.
3. drop optical detection apparatus according to claim 1, which is characterized in that the opaque drop photodetector
（5）With transparent drop photodetector（6）It is the detector based on photodiode, and the opaque drop photodetection
Device（5）In photodiode and the transparent drop photodetector（6）In photodiode differential concatenation connection.
4. drop optical detection apparatus according to claim 3, which is characterized in that the opaque drop photodetector
（5）Including the first photodiode and first resistor, the transparent drop photodetector（6）Including the second photodiode and
The negative pole end of second resistance, second photodiode is connected to voltage source, and the positive terminal of second photodiode connects
It is connected to one end of the second resistance, the other end ground connection of the second resistance, in the positive terminal of second photodiode
The transparent drop photodetector is drawn between the second resistance（6）Detectable signal output end；First photoelectricity
The positive terminal of diode is grounded, and the negative pole end of first photodiode is connected to one end of the first resistor, and described the
The other end of one resistance is connected to the voltage source, between the negative pole end and the first resistor of first photodiode
Draw the opaque drop photodetector（5）Detectable signal output end, first photodiode and the second photoelectricity
Diode is in the conduction state in the output beam for receiving laser.
5. drop optical detection apparatus according to claim 4, which is characterized in that reach swashing for laser when there is no drop
When light irradiation area, the opaque drop photodetector（5）With transparent drop photodetector（6）Output low level letter
Number；When transparent liquid is dripped to up to the laser-irradiated domain of laser, the opaque drop photodetector（5）Export low level
Signal, the transparent drop photodetector（6）Export high level signal；When opaque transparent liquid drips to the laser irradiation up to laser
When region, the opaque drop photodetector（5）Export high level signal, the transparent drop photodetector（6）It is defeated
Go out low level signal.
6. according to claim 1-5 any one of them drop optical detection apparatus, which is characterized in that the detectable signal processing
Equipment（7）Including signal amplifier（12）, narrow band filter（13）, envelope detector（14）, waveform shaper（15）With it is described
Microprocessor（16）, the signal amplifier（12）It is connected to the detectable signal output end of the photodetector, the signal
Amplifier（12）Output end be connected to the narrow band filter（13）, the narrow band filter（13）Output end be connected to institute
State envelope detector（14）, the envelope detector（14）Output end be connected to the waveform shaper（15）, the waveform
Reshaper（15）Output end be connected to the microprocessor（16）.
7. drop optical detection apparatus according to claim 6, which is characterized in that the detectable signal processing equipment（7）
Including the first signal amplifier, the first narrow band filter, the first envelope detector, first waveform reshaper, second signal amplification
Device, the second narrow band filter, the second envelope detector, the second waveform shaper and the microprocessor, first signal are put
Big device, the first narrow band filter, the first envelope detector, first waveform reshaper and the microprocessor are sequentially connected, and are used for
Handle opaque drop photodetector（5）Detectable signal, and first signal amplifier is connected to the opaque transparent liquid
Drip photodetector（5）Detectable signal output end；The second signal amplifier, the second narrow band filter, the inspection of the second envelope
Wave device, the second waveform shaper and the microprocessor are sequentially connected, for handling transparent drop photodetector（6）Detection
Signal, and the second signal amplifier is connected to the transparent drop photodetector（6）Detectable signal output end.
8. according to claim 1-5 any one of them drop optical detection apparatus, which is characterized in that further include having narrow-band-filter
Piece（10）And/or alert device（8）, the spike filter（10）It is respectively arranged at the opaque drop photodetector
（5）With transparent drop photodetector（6）Detection window, and the spike filter（10）Band-pass wavelength be the laser
The centre wavelength of device；The alert device（8）It is connected to the detectable signal processing equipment（7）, and include alarm and/or
State display lamp（17）.
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| CN107153018B (en) * | 2017-06-20 | 2019-07-05 | 上海交通大学 | A kind of droplet generator and drop manufacturing method |
| CN108514895A (en) * | 2018-03-01 | 2018-09-11 | 北京天健惠康生物科技有限公司 | A kind of microlayer model generates and monitoring device |
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