CN106680888A - Droplet optical detection device - Google Patents
Droplet optical detection device Download PDFInfo
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- CN106680888A CN106680888A CN201710063769.1A CN201710063769A CN106680888A CN 106680888 A CN106680888 A CN 106680888A CN 201710063769 A CN201710063769 A CN 201710063769A CN 106680888 A CN106680888 A CN 106680888A
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- Prior art keywords
- drop
- photodetector
- laser
- transparent
- opaque
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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 invention provides a droplet optical detection device. The droplet optical detection device comprises a laser device, a laser modulation power supply, a non-transparent droplet photoelectric detector, a transparent droplet photoelectric detector and detection signal processing equipment, wherein the laser modulation power supply is connected to the laser device, the non-transparent droplet photoelectric detector is located on the output light path of the laser device, the transparent droplet photoelectric detector and the non-transparent droplet photoelectric detector are arranged side by side, the transparent droplet photoelectric detector is located over the non-transparent droplet photoelectric detector, and both the non-transparent droplet photoelectric detector and the transparent droplet photoelectric detector are connected to the detection signal processing equipment. By adopting the optical detection method, dynamic non-contact detection of droplets is achieved, and it is guaranteed that droplets to be detected are not contaminated in the detection process; by adopting the single-light-source double detectors, the droplet detection stability is improved, transparent droplets and non-transparent droplets can be detected at the same time, and the droplet detection application range is widened; besides, the influence of ambient light on droplet detection is effectively avoided, and the droplet optical detection device has broad application prospects.
Description
Technical field
The present invention relates to drop detection technical field, and in particular to a kind of drop optical detection apparatus.
Background technology
Liquid drop speed detection has utilization extensively at aspects such as medical science, chemical industry, agriculture dispensers.The micrometeor detection of liquid is used
Compare many flow velocitys for being drop method, liquid being determined by being counted with unit interval drop.At present, most hospitals are to disease
People carries out transfusion state when venous transfusion, and, by patient or nurse's manual observation, whether patient need at any time note just being dripped under drop
Often, whether drop has dripped off, if note abnormalities reinforming nurse's treatment.For handicapped elderly patients and having many
The transfusion hall that patient infuses simultaneously, nurse to would have to take much time and at every moment pay close attention to transfusion state with energy.
There is sub-fraction hospital to employ electronic infusion monitoring arrangement, but many devices can only detect the presence or absence of liquid medicine, and cannot detect
" race pin ", infuse too fast or too slow etc. abnormal.Additionally, in fields such as chemical industry, pharmacy, many detections to drop are used and connect
Touch is measured, but these measuring methods are the problems such as often bring pollution, and also some detectors are detected using photoelectric method, but
It is that can only detect transparent drop, or opaque drop can only be detected.
The content of the invention
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, it is ensured that detection process will not pollute drop to be measured, while using
Single light source double detector, not only increases the stability of drop detection, and drop is carried out in real time based on optical non-contact
Detection, no matter drop is transparent or opaque, can simultaneously detect the lower drop-wise state of drop, improve drop inspection
The scope of application is surveyed, in addition by by Laser modulation into quasi-continuous output mode, and end installs optical filter additional before the detectors, has
Effect ground solves influence of the ambient light to drop detection, can be widely applied to infusion monitoring, pharmacy and wine brewing that medical treatment aids in,
The real-time detection of various transparent, the opaque drop in the fields such as petrochemical industry, environmental protection.
The technical scheme that present invention solution above-mentioned technical problem is taken is as follows：
A kind of drop optical detection apparatus, including：Laser 1, Laser Modulation power supply 3, opaque drop photodetector
5th, 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 in the surface of 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 passage 2 is between the laser 1 and photodetector, when no drop passes through drop passage 2, laser 1
Output beam is only irradiated to the opaque drop photodetector 5；When transparent drop passes through drop passage 2, laser 1
Output beam can simultaneously be irradiated to the opaque drop photodetector 5 and transparent drop photoelectricity after being reflected by transparent drop
Detector 6；When opaque drop passes through drop passage 2, the output beam of laser 1 cannot be shone by opaque liquid droplets intercept
It is mapped to the opaque drop photodetector 5 and transparent drop photodetector 6.
Further according to drop optical detection apparatus of the present invention, wherein also including diverging prism 4, the hair
Dissipate prism 4 to be arranged 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 that the Line beam after in-line Line beam, and diverging will not be irradiated to the transparent drop photodetector 6.
Further according to drop optical detection apparatus of the present invention, wherein opaque transparent liquid drop photodetector
5 and transparent drop photodetector 6 be the detector based on photodiode, and the opaque drop photodetector 5
In photodiode and the transparent drop photodetector 6 in photodiode differential concatenation connection.
Further according to drop optical detection apparatus of the present invention, wherein opaque transparent liquid drop photodetector
5 include the first photodiode and first resistor, and the transparent drop photodetector 6 includes the second photodiode and second
Resistance, the negative pole end of 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, positive terminal and institute in second photodiode
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
Receive in the conduction state during the output beam of laser.
Further according to drop optical detection apparatus of the present invention, wherein when no drop reaches swashing for laser
During light irradiation region, the opaque drop photodetector 5 and transparent drop photodetector 6 export low level signal；
When transparent liquid drips to the laser-irradiated domain up to laser, the opaque output of drop photodetector 5 low level signal,
The transparent output of drop photodetector 6 high level signal；When opaque transparent liquid drips to the laser-irradiated domain up to laser,
The opaque output of drop photodetector 5 high level signal, the transparent output of the drop photodetector 6 low level letter
Number.
Further according to drop optical detection apparatus of 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
Narrow band filter 13, the output end of 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 according to drop optical detection apparatus of 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, secondary signal amplifier,
Second narrow band filter, the second envelope detector, the second waveform shaper and the microprocessor, first signal amplify
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 secondary signal amplifier, the second narrow band filter, the second envelope detector,
Two waveform shapers and the microprocessor are sequentially connected, the detectable signal for processing transparent drop photodetector 6, and institute
State the detectable signal output end that secondary signal amplifier is connected to the transparent drop photodetector 6.
Further according to drop optical detection apparatus of the present invention, wherein the microprocessor can be based on photoelectricity
The drop detectable signal of detector output drips frequency under calculating drop, and to can determine that and drip whether speed deviates default under drop
Whether critical field and drop stop drop, while drop abnormal control signal can be exported externally.
It is further according to drop optical detection apparatus of the present invention, wherein also include narrow band pass filter 10 and/
Or alert device 8, the narrow band pass filter 10 is respectively arranged at the opaque drop photodetector 5 and transparent drop photoelectricity
The detection window of detector 6, and the narrow band pass filter 10 band-pass wavelength be the laser centre wavelength；The prompting
Equipment 8 is connected to the detectable signal processing equipment 7, and includes alarm and/or state display lamp 17.
Further according to drop optical detection apparatus of the present invention, wherein wavelength exists centered on the laser 1
635nm, mean power are the semiconductor laser of 2mW, and the laser 1 is modulated into 10KHz's by the Laser Modulation power supply 3
Quasi-continuous lasing is exported, and the band-pass wavelength of the narrow band pass filter is 635nm, and the centre frequency of the narrow band filter 13 is
10KHz, the diverging prism 4 is Bao Weier prism.
Technical scheme has following technological innovation feature and technique effect：
1), the present invention detects the lower drop of drop using optical method, when drop passes through in the optical path, 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
Change, signal processing circuit can judge the lower drop of drop according to the change 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 is faced
Lasing light emitter, when there is opaque drop to pass perpendicularly through the space in the middle of 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 during drop, and form a convex lens in space due to drop when there is transparent drop, by laser
Directional light converge after diverge again, now just have laser 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) as the laser of probe source it is, semiconductor laser in the present invention, output wavelength is the feux rouges of 635nm,
Power 2mW, the absorption due to drop or refraction action when drop passes through, the scattering light of surrounding also has a shake, Ke Yiqi
To the effect of the user's prompting to surrounding.
4), laser output window of the present invention is provided with Bao Weier prism, its output be not spot light but into
The line source of " one " font, it is ensured that drop drop can also be shone when inclined by laser, improve detectability.
5), laser is operationally modulated into the quasi-continuous output of 10KHz 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, the wave filter declines to the signal of 10KHz
Subtract very little, and very big for the signal attenuation of other frequencies, the veiling glares such as light outside laser can be filtered, substantially increase
The interference free performance of drop detection.
6), two detector windows are assembled with optical filter, and the optical filter only allows the 635nm wavelength that laser sent
Light passes through, and the veiling glare of other wavelength can be sponged, and further avoids influence of the veiling glare to detector.
7) envelope detection circuit is sent into after, the signal of detector output is by amplifying, filtering in the present invention, drop is obtained
Electric impulse signal when passing through, then by shaping pulse, send into signal processing circuit.Signal processing circuit is by a microprocessor
Composition, is processed by the two paths of signals sent into, and can calculate the time interval between adjacent 2 drops such that it is able to obtain
The frequency dripped under drop, and then can analyze and drip under drop speed and whether be faster than numerical value of certain setting, or be slower than certain and set
Fixed numerical value, can also judge whether drop stops drop, and indicating reminders are carried out with different light emitting diodes to different situations, real
The detection of drop multi-motion state is showed, processor can also be led to 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), in a word, drop optical detection apparatus of the present invention detects drop using optical means, is that a kind of nothing connects
Drop detection method is touched, any pollution will not be caused to liquid, and can be realized simultaneously to transparent drop and opaque drop
Detection, and accuracy of detection is higher, the scope of application is very wide, such as device of the present invention is applied into infusion monitoring, can not only be real
When detection drop whether dripped off, and dynamic instrumentation can be carried out to transfusion state, when there is accidents such as " race pins "
When causing drop to stop drop, it is also possible to real-time detected by detection means and provide alarm signal, and work as drop drip too fast or
When too slow, warning device can be also triggered, remind nurse to come to dispose, therefore drop optical detection apparatus of the present invention has extensively
Wealthy marketing application prospect and practical value.
Brief 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.
Fig. 3 is that Laser Output Beam is " one " word by the diverging of diverging prism in drop optical detection apparatus of the present invention
The schematic diagram of shape wire hot spot.
Fig. 4 is that when using drop optical detection apparatus of the present invention, transparent drop swashs when not reaching laser-irradiated domain
The situation of each detector of light irradiation and the output schematic diagram of each detector.
Fig. 5 is that transparent liquid is dripped to up to laser during laser-irradiated domain when using drop optical detection apparatus of the present invention
Irradiate the situation of each detector and the output schematic diagram of each detector.
Fig. 6 is when using drop optical detection apparatus of the present invention, when opaque drop does not reach laser-irradiated domain
Laser irradiates the situation of each detector and the output schematic diagram of each detector.
Fig. 7 is that when using drop optical detection apparatus of the present invention, opaque transparent liquid is dripped to and swashed up to during laser-irradiated domain
The situation of each detector of light irradiation and the output schematic diagram of each detector.
The implication of each reference is as follows in figure：
1- lasers, 2- drop passages, 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- narrow band pass 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 embodiment
Technical scheme is described in detail below in conjunction with accompanying drawing, so that those skilled in the art can be more
Plus the present invention is clearly understood from, but therefore do not limit the scope of the invention.
Drop optical detection apparatus of the present invention as shown in Figure 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 set
Standby 8, all parts can be fixed on same substrate 11, and substrate is installed on 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 during work.The laser 1 used as probe source, partly lead by preferred use
Body laser, output wavelength is the feux rouges of 635nm, power 2mW, the absorption due to drop or refraction action, meeting when drop passes through
So that the scattering light of surrounding also has a shake, the user's prompting to surrounding can be played a part of.In the defeated of laser
Go out in light path to be disposed with diverging prism 4 and the opaque drop photodetector 5, and the opaque drop photoelectricity is visited
Survey 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 is close to set side by side with the opaque drop photodetector 5, and in institute
State the surface of opaque drop photodetector 5.The diverging prism 4 is preferably Bao Weier prism, by the diverging
The laser-beam divergence that prism 4 exports laser is " one " font line source, as shown in Figure 3, and is sent out through the diverging prism 4
The whole incidence surface of line source after the dissipating full opaque drop photodetector 5 of irradiation just, at the same will not divergent irradiation to saturating
Bright drop photodetector 6, so installs Bao Weier prism by laser output window, and make laser output is not a little
Light source but line 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 is ensure that
Can be also irradiated with a laser when dripping inclined, improve detectability.It is further preferred in the opaque drop photodetector 5
Narrow band pass filter 10 is fitted with the detection window of transparent drop photodetector 6, the narrow band pass filter only allows laser
The 635nm centre wavelength light for being sent passes through, and the veiling glare of other wavelength can then be sponged, and further avoids veiling glare 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 the 7 pairs of transparent drop photodetectors 6 are input into opaque drop photodetector 5 is processed, and then is judged
The drop for being detected is transparent drop or opaque drop, and can simultaneously process the drippage state for obtaining drop, including drop
Terminal-velocity degree, the information such as whether drip off, and enabling signal has been sent to the alert device 8 when judging that drippage is abnormal, by institute
Stating alert device 8 carries out drips abnormal state prompting.
Further circuit composition structure as shown in Figure 2, described opaque drop photodetector 5 and transparent liquid
Drop photodetector 6 is the detector based on photodiode, and differential concatenation is connected.The specific opaque drop light
Electric explorer 5 includes the first photodiode and first resistor, and the transparent drop photodetector 6 includes the pole of the second photoelectricity two
Pipe and second resistance, the photodiode are receiving in the conduction state, second photodiode when light beam irradiates
It is connected with the first photodiode differential concatenation, the negative pole end of specific second photodiode is connected to voltage source
VCC, the positive terminal of second photodiode is connected to one end of the second resistance, and the other end of the second resistance is
Low level end (preferably grounded), transparent drop is drawn 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
The voltage source VCC is connected to, 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 processing opaque drop photoelectricity
The first signal amplifier, the first narrow band filter, the first envelope detector and the first waveform reshaper of device output signal are surveyed, with
And for processing secondary signal amplifier, the second narrow band filter, second envelope of transparent drop photodetector output signal
Wave detector and the second waveform shaper, and microprocessor 16.The detectable signal output of the opaque drop photodetector 5
End is connected to first signal amplifier, and the output end of first signal amplifier is connected to first narrow-band filtering
Device, the output end of first narrow band filter is connected to the first envelope detector, the output end of first envelope detector
First waveform reshaper is connected to, 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 secondary signal amplifier, the secondary 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
Device, the output end of 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 arrowband are sent into after its amplification
Wave filter 13 is and very big for the signal attenuation of other frequencies to the signal attenuation very little of 10KHz, thus can filter laser it
The veiling glares such as outer light, substantially increase the interference free performance of drop detection, while after being filtered through narrow band filter 13
The electric impulse signal that signal feeding envelope detector 14 obtains when drop passes through, then to carry out electric pulse by waveform shaper 15 whole
Shape, the signal feeding microprocessor 16 after shaping.Using two groups of signal amplifiers, narrow band filter, envelope detector and waveforms
Reshaper independently processes the detectable signal that opaque drop photodetector and transparent drop photodetector are provided, not only
The interference free performance of drop detection is improve, and ensure that drop detection precision.The microprocessor is by the liquid to sending into
Drop detectable signal is processed, and can calculate the time interval between two neighboring drop such that it is able to obtained under drop
The frequency of drop, and then can analyze and drip under drop speed and whether be faster than numerical value of certain setting, or it is slower than number of certain setting
Value, can also judge whether drop stops drop, and produce different alerting signals to different situations, realize drop multi-motion shape
The detection of state is reminded, wherein described alert device preferably includes alarm and state display lamp 17, such microprocessor energy
Enough indicating reminders are carried out based on the different state display lamps of different drop detection situation drivings.The microprocessor 16 is gone back simultaneously
Communication interface 18 is provided with, to realize being communicated with miscellaneous equipment or device, drop-wise state under drop miscellaneous equipment or device is transmitted to.
The operation principle or worked of drop optical detection apparatus of the present invention is finally illustrated with reference to accompanying drawing 4 to accompanying drawing 7
Journey：
As shown in Figure 4, when transparent drop is by drop passage 2, when drop does not reach laser-irradiated domain, laser
The laser beam that device 1 sends only be irradiated to just to opaque drop photodetector 5 on, in combination with accompanying drawing 2, opaque drop
Photodiode in photodetector 5 is turned under light illumination, and opaque drop photodetector 5 is to detectable signal processing equipment
Output low level signal, while because no laser irradiates on transparent drop photodetector 6, transparent drop photodetector 6
In photodiode disconnected under no light, transparent drop photodetector 6 to detectable signal processing equipment export low level
Signal, so as to judge that no drop irradiates detecting area by laser when detectable signal processing equipment receives only low level signal
Domain.
As shown in Figure 5, when there is transparent drop by drop passage 2, when drop reaches laser-irradiated domain, laser
The laser beam that device 1 sends is irradiated on transparent drop 9, and now transparent drop is played equivalent to an optical lens to laser beam
Anaclasis effect so that laser be focused after critical dimensions quickly again, so as under the refraction disperse function of transparent drop, such as
Shown in accompanying drawing 5, laser beam has now been irradiated to opaque drop photodetector 5 and transparent drop photodetector 6 simultaneously
Detection window, in combination with accompanying drawing 2, now the photodiode in opaque drop photodetector 5 continues under light illumination
Conducting, opaque drop photodetector 5 exports low level signal to detectable signal processing equipment, while now transparent drop light
Photodiode in electric explorer 6 continues conducting under light illumination, and transparent drop photodetector 6 is to detectable signal processing equipment
Output high level signal, so that when detectable signal processing equipment receives the high level letter from transparent drop photodetector 6
Number when judge now there is transparent drop to irradiate search coverage by laser, further when drop is dripped to below laser-irradiated domain
When, the irradiation laser on transparent drop photodetector 6 can be disappeared again, and low level signal output has been recovered again.
As shown in Figure 6, when opaque drop is by drop passage 2, when opaque drop does not reach laser irradiation area
During domain, the laser beam that laser 1 sends only be irradiated to just to opaque drop photodetector 5 on, in combination with accompanying drawing 2,
Photodiode in opaque drop photodetector 5 is turned under light illumination, and opaque drop photodetector 5 is believed to detection
Number processing equipment output low level signal, while because no laser irradiates on transparent drop photodetector 6, transparent drop light
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, so as 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 Figure 7, when there is opaque drop by drop passage 2, when opaque transparent liquid is dripped to up to laser irradiation area
During domain, the laser beam that laser 1 sends is irradiated on opaque drop and is stopped by opaque drop absorption, due to opaque transparent liquid
Drop blocks light path of the laser illumination to opaque drop photodetector 5 so that now opaque drop photodetection
There is no light beam to irradiate on device 5, photodiode therein disconnects under no light, thus opaque drop photodetector 5 this
When to detectable signal processing equipment export high level signal；Simultaneously now on transparent drop photodetector 6 due to no laser
Irradiation, photodiode therein continues to disconnect under no light, and transparent drop photodetector 6 is to detectable signal processing equipment
Output low level signal, so that when detectable signal processing equipment receives the high level from opaque drop photodetector 5
Judge now there is opaque drop to irradiate search coverage by laser during signal, further when drop drips to laser-irradiated domain
During lower section, the irradiation laser on opaque drop photodetector 5 can recover again, it is recovered low level signal again and export.
It can be seen that the present invention detects the lower drop of drop using optical method, when drop passes through in the optical path, 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 change of output signal, detectable signal processing equipment can be judged transparent, opaque according to the change of detector output signal
The lower drop of drop, while the detectable signal processing equipment can calculate the time interval between two neighboring drop, so that
Can obtain the frequency dripped under drop, and then can analyze and drip the numerical value whether speed is faster than certain setting under drop, or slowly
In the numerical value that certain sets, can also judge whether drop stops drop, and different alerting signals are produced to different situations, realize
The detection of drop multi-motion state is reminded.
The above is only and the preferred embodiment of the present invention is described, technical scheme is not limited to
This, any known deformation that those skilled in the art are made on the basis of major technique of the invention design belongs to the present invention
Claimed technology category, the specific protection domain of the present invention is defined by the record of claims.
Claims (10)
1. a kind of drop optical detection apparatus, it is characterised in that including：Laser (1), Laser Modulation power supply (3), opaque transparent liquid
Drop photodetector (5), transparent drop photodetector (6) and detectable signal processing equipment (7), the Laser Modulation power supply
(3) laser (1), the opaque output light path of the drop photodetector (5) in the laser (1) are connected to
On, the transparent drop photodetector (6) is arranged side by side with the opaque drop photodetector (5), and in described
The surface of opaque drop photodetector (5), the opaque drop photodetector (5) and transparent drop photodetection
Device (6) is all connected to the detectable signal processing equipment (7)；Drop passage (2) is in the laser (1) and photodetector
Between, when no drop passes through drop passage (2), the output beam of laser (1) is only irradiated to the opaque drop light
Electric explorer (5)；When transparent drop passes through drop passage (2), the output beam of laser (1) reflected by transparent drop after energy
It is enough to be irradiated to the opaque drop photodetector (5) and transparent drop photodetector (6) simultaneously；When opaque drop is logical
When crossing drop passage (2), the output beam of laser (1) cannot be irradiated to the opaque drop by opaque liquid droplets intercept
Photodetector (5) and transparent drop photodetector (6).
2. drop optical detection apparatus according to claim 1, it is characterised in that also include diverging prism (4), it is described
Diverging prism (4) is arranged on the output light path of the laser (1), can be by laser (1) by diverging prism (4)
The laser-beam divergence of output is that the Line beam after in-line Line beam, and diverging will not be irradiated to the transparent drop photodetection
Device (6).
3. drop optical detection apparatus according to claim 1, it is characterised in that the opaque drop photodetector
And transparent drop photodetector (6) is the detector based on photodiode, and the opaque drop photodetection (5)
Photodiode differential concatenation connection in photodiode and the transparent drop photodetector (6) in device (5).
4. drop optical detection apparatus according to claim 3, it is characterised in that the opaque drop photodetector
(5) including the first photodiode and first resistor, the transparent drop photodetector (6) including the second photodiode and
Second resistance, the negative pole end of 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 detectable signal output end of the transparent drop photodetector (6) is drawn and the second resistance between；First photoelectricity
The positive terminal ground connection of diode, 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 detectable signal output end of the opaque drop photodetector (5), first photodiode and the second photoelectricity
Diode is in the conduction state when the output beam of laser is received.
5. drop optical detection apparatus according to claim 4, it is characterised in that when no drop reaches swashing for laser
During light irradiation region, the opaque drop photodetector (5) and transparent drop photodetector (6) export low level letter
Number；When transparent liquid drips to the laser-irradiated domain up to laser, opaque drop photodetector (5) the output low level
Signal, transparent drop photodetector (6) the output high level signal；When the laser that opaque transparent liquid is dripped to up to laser irradiates
During region, opaque drop photodetector (5) the output high level signal, the transparent drop photodetector (6) are defeated
Go out low level signal.
6. the drop optical detection apparatus according to claim any one of 1-5, it is characterised in that the detectable signal treatment
Equipment (7) includes signal amplifier (12), narrow band filter (13), envelope detector (14), waveform shaper (15) and micro- place
Reason device (16), the signal amplifier (12) is connected to the detectable signal output end of the photodetector, and the signal amplifies
The output end of device (12) is connected to the narrow band filter (13), and the output end of the narrow band filter (13) is connected to the bag
Network wave detector (14), the output end of the envelope detector (14) is connected to the waveform shaper (15), the waveform shaping
The output end of device (15) is connected to the microprocessor (16).
7. drop optical detection apparatus according to claim 6, it is characterised in that the detectable signal processing equipment (7)
Amplify including the first signal amplifier, the first narrow band filter, the first envelope detector, first waveform reshaper, secondary signal
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
The detectable signal of opaque drop photodetector (5) is processed, and first signal amplifier is connected to the opaque transparent liquid
The detectable signal output end of drop photodetector (5)；The secondary signal amplifier, the second narrow band filter, the inspection of the second envelope
Ripple device, the second waveform shaper and the microprocessor are sequentially connected, the detection for processing transparent drop photodetector (6)
Signal, and the secondary signal amplifier is connected to the detectable signal output end of the transparent drop photodetector (6).
8. drop optical detection apparatus according to claim 6, it is characterised in that the microprocessor can be based on photoelectricity
The drop detectable signal of detector output drips frequency under calculating drop, and to can determine that and drip whether speed deviates default under drop
Whether critical field and drop stop drop, while drop abnormal control signal can be exported externally.
9. the drop optical detection apparatus according to claim any one of 1-8, it is characterised in that also include narrow-band-filter
Piece (10) and/or alert device (8), the narrow band pass filter (10) are respectively arranged at the opaque drop photodetector
(5) and transparent drop photodetector (6) detection window, and the narrow band pass filter (10) band-pass wavelength be the laser
The centre wavelength of device；The alert device (8) is connected to the detectable signal processing equipment (7), and include alarm and/or
State display lamp (17).
10. the drop optical detection apparatus according to claim any one of 1-9, it is characterised in that the laser (1) is
Centre wavelength is the semiconductor laser of 2mW in 635nm, mean power, and the Laser Modulation power supply (3) is by the laser
(1) the quasi-continuous lasing output of 10KHz is modulated into, the band-pass wavelength of the narrow band pass filter is 635nm, the narrow band filter
(13) centre frequency is 10KHz, and the diverging prism (4) is Bao Weier prism.
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| CN106680888B (en) | 2018-10-23 |
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Effective date of registration: 20190611 Address after: 350101 Guangming Village, Jingxi Town, Minhou County, Fuzhou City, Fujian Province Patentee after: FUZHOU ZIFENG PHOTOELECTRIC SCIENCE & TECHNOLOGY CO., LTD. Address before: 710072 Middle School Affiliated to Northwest Polytechnic University, No. 127 Youyi West Road, Beilin District, Xi'an City, Shaanxi Province Patentee before: Bai Yuze |