CN108387943B - A kind of drop optical detection apparatus - Google Patents
A kind of drop optical detection apparatus Download PDFInfo
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- CN108387943B CN108387943B CN201710063770.4A CN201710063770A CN108387943B CN 108387943 B CN108387943 B CN 108387943B CN 201710063770 A CN201710063770 A CN 201710063770A CN 108387943 B CN108387943 B CN 108387943B
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- drop
- photodetector
- opaque
- transparent
- light source
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P1/00—Details of instruments
- G01P1/07—Indicating devices, e.g. for remote indication
- G01P1/08—Arrangements of scales, pointers, lamps or acoustic indicators, e.g. in automobile speedometers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/26—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the direct influence of the streaming fluid on the properties of a detecting optical wave
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 and opaque drop photodetector are arranged side by side, and it is in the surface of 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 environment 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 technique
Liquid drop speed detection has extensive utilization in terms of medicine, chemical industry, agricultural.The micrometeor of liquid, which detects, to be used
More is drop method, and the flow velocity of liquid is determined by being counted with unit time drop.Currently, most hospitals are to disease
Transfusion state need to pay attention to whether just dripping under drop by patient or nurse's artificial observation, patient at any time when people carries out venous transfusion
Often, whether drop has dripped off, and reinforms nurse's processing if noting abnormalities.For handicapped elderly patients and there are many
The infusion hall that patient is infused simultaneously, nurse, which 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, many detections to drop, which use, to be connect in fields such as chemical industry, pharmacy
The problems such as touch measures, but these measurement methods often bring pollution, also some detectors are detected using photoelectric method, but
It is that can only detect transparent drop, or opaque drop can only be detected.
Summary of the invention
The present invention is based on above-mentioned prior art problem, innovation proposes a kind of drop optical detection apparatus, by using light
Learn detection method, realize the dynamic contact-free detection to drop, guarantee detection process will not can not drop to be measured, use simultaneously
Single light source double detector is not only increased the stability of drop detection, and is carried out in real time based on optical non-contact to drop
Detection, regardless of drop be it is transparent or opaque, the lower drop-wise state of drop can be detected simultaneously, improve drop inspection
The scope of application is surveyed, furthermore by the way that end installs optical filter additional at quasi-continuous output mode, and before the detectors by Laser modulation, is had
Effect ground solve influence of the environment 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, comprising: light source, opaque drop photodetector 5, transparent drop photodetection
Device 6 and detectable signal processing equipment 7, the opaque drop photodetector 5 is on the output light path of the light source, described
Transparent drop photodetector 6 is close to setting, the opaque drop photoelectricity with the opaque drop photodetector 5 side by side
Detector 5 and transparent drop photodetector 6 are all connected to the detectable signal processing equipment 7；Drop channel 2 is in the light
Between source and photodetector, when not having drop by drop channel 2, the output beam of light source is only irradiated to described opaque
Drop photodetector 5；When transparent drop passes through drop channel 2, the output beam of light source can after being reflected by transparent drop
It is irradiated to the opaque drop photodetector 5 and transparent drop photodetector 6 simultaneously；When opaque drop passes through drop
When channel 2, the output beam of light source can not be irradiated to opaque 5 He of drop photodetector by opaque liquid droplets intercept
Transparent drop photodetector 6；The detection of the opaque drop photodetector 5 and the transparent drop photodetector 6
Working mechanism is just the opposite.
Further drop optical detection apparatus according to the present invention, wherein the opaque transparent liquid drips photodetector
5 generate low level signal output in the light beam irradiation for receiving light source, the generation in the light beam irradiation for being not received by light source
High level signal output, the transparent drop photodetector 6 generate high level signal in the light beam irradiation for receiving light source
Output generates low level signal output in the light beam irradiation for being not received by light source；Or the opaque drop photoelectricity is visited
It surveys device 5 and generates high level signal output in the light beam irradiation for receiving light source, in the light beam irradiation for being not received by light source
Low level signal output is generated, the transparent drop photodetector 6 generates low level in the light beam irradiation for receiving light source
Signal output generates high level signal output in the light beam irradiation for being not received by light source.
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 light source, can be by the beam divergence of light source output by the diverging prism 4
Linear type Line beam, and the Line beam after diverging will not be irradiated to the transparent drop photodetector 6, while the transparent liquid
Drop photodetector 6 is close to setting with the opaque drop photodetector 5 along the diverging direction of the Line beam side by side.
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
Resistance, the negative pole end of second photodiode are connected to high voltage end, the positive terminal connection of second photodiode
The other end in one end of the second resistance, the second resistance is connected to low-voltage end, in second photodiode
Positive terminal and the second resistance between draw the detectable signal output end of the transparent drop photodetector 6；Described
The positive terminal of one photodiode is connected to low-voltage end, and the negative pole end of first photodiode is connected to first electricity
One end of resistance, the other end of the first resistor are connected to the high voltage end, in the negative pole end of first photodiode
The detectable signal output end of the opaque drop photodetector 5, first photoelectricity are drawn between the first resistor
Diode and the second photodiode are in the conductive state in the output beam for receiving light source.
Further drop optical detection apparatus according to the present invention, wherein when the laser for not having drop to reach light source
When irradiation area, the opaque drop photodetector 5 and transparent drop photodetector 6 export low level signal；When
When transparent liquid is dripped to up to the laser-irradiated domain of light source, the opaque drop photodetector 5 exports low level signal, described
Transparent drop photodetector 6 exports high level signal；When opaque transparent liquid is dripped to up to the laser-irradiated domain of light source, it is described not
Transparent drop photodetector 5 exports high level signal, the transparent drop photodetector 6 exports low level signal.
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
Narrow band filter 13, the output end of the narrow band filter 13 are 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, for handling the detectable signal of transparent drop photodetector 6, and institute
State the detectable signal output end that second signal amplifier is connected to the transparent drop photodetector 6；The microprocessor energy
Enough drop detectable signals exported based on photodetector, which are calculated, drips frequency under drop, and can determine whether drip speed under drop
Deviate preset critical field and whether drop stops to drip, while can externally export drop abnormal control signal.
Further drop optical detection apparatus according to the present invention, wherein further include have narrow band filter 10 and/
Or alert device 8, the narrow band filter 10 are respectively arranged at the opaque drop photodetector 5 and transparent drop photoelectricity
The detection window of detector 6, and the band-pass wavelength of the narrow band filter 10 is the central wavelength of the light source；The prompting is set
Standby 8 are connected to the detectable signal processing equipment 7, and include alarm and/or state display lamp 17.
Further drop optical detection apparatus according to the present invention, wherein the light source is that center wavelength exists
635nm, the semiconductor laser that mean power is 2mW, and the semiconductor laser is modulated into the quasi-continuous lasing of 10KHz
The band-pass wavelength of output, the narrow band filter is 635nm, and the centre frequency of the narrow band filter 13 is 10KHz, the hair
Dissipating prism 4 is Bao Weier prism；Drippage direction and the opaque drop light of the transparent drop photodetector 6 along drop
Electric explorer 5 is close to setting side by side.
Technical solution of the present invention has the characteristics that following technological innovation and technical 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 will lead to the luminous intensity being irradiated on detector and 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), the property transparent and opaque for 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
Laser source, 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 transparent drop and opaque drop will be separately detected 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 has a 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, the 635nm wavelength which only allows laser to be issued
Light passes through, and can sponge to the stray light of other wavelength, further avoids influence of the stray light to detector.
7), the signal of detector output is sent into envelope detection circuit after amplification, filtering in the present invention, 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 is handled by the two paths of signals to feeding, the time interval between adjacent 2 drops can be calculated, so as to obtain
The frequency dripped under drop, and then can analyze and drip the numerical value whether speed is faster than some setting under drop, or be slower than some and set
Fixed numerical value, also judges out whether drop stops to drip, and carries out indicating reminders with different light emitting diodes to different situations, real
The detection of drop multi-motion state is showed, furthermore processor can also be logical by serial ports (USART) and other devices
Letter, is transmitted to other devices for drop-wise state under drop.
It 8) 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 detection accuracy 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 drip too fast when drop 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.
Detailed description of the invention
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, laser when transparent liquid is dripped to up to 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, swash when opaque transparent liquid is dripped to up to laser-irradiated domain
Light irradiates the output schematic diagram of the case where each detector and each detector.
The meaning of each appended drawing reference is as follows in figure:
1- laser, 2- drop channel, 3- Laser Modulation power supply, 4- diverging prism, the opaque drop photodetector of 5-,
The transparent drop photodetector of 6-, 7- detectable signal processing equipment, 8- alert device, 9- drop, 10- narrow band filter, 11- base
Plate, 12- signal amplifier, 13- narrow band filter, 14- envelope detector, 15- waveform shaper, 16- microprocessor, 17- shape
State display lamp, 18- communication interface.
Specific embodiment
Technical solution 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 scope 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 and carries out perpendicular locating 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, and preferred use partly is led
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
So that the scattering light of surrounding also has a shake, user's prompt to surrounding can be played the role of.In the defeated of laser
The diverging prism 4 and opaque drop photodetector 5 are disposed in optical path out, and the opaque drop photoelectricity is visited
It surveys device 5 and the diverging prism 4 is on same linear light path, opaque drop photodetector 5 is being in diverging prism 4 just
Rear, the transparent drop photodetector 6 are close to setting, preferred edge with the opaque drop photodetector 5 side by side
Drips direction is in the surface or underface of the opaque drop photodetector 5.The diverging prism 4 is preferred
It is linear type linear light source, such as attached drawing by the laser-beam divergence that the diverging prism 4 exports laser for Bao Weier prism
Shown in 3, and the linear light source after the diverging prism 4 dissipates irradiates entirely entering for full opaque drop photodetector 5 just
Smooth surface, at the same will not divergent irradiation to transparent drop photodetector 6, in this way by laser output window install Bao Weier
Prism, make laser output is not point light source but linear light source, is not only able to guarantee that laser passes through when no drop
Dissipating prism, only direct irradiation is on opaque drop photodetector, without being irradiated to the transparent drop light being positioned above
On electric explorer, and ensure that drop drop it is inclined when can also be irradiated with a laser, improve detectability.It is further preferred
Narrow band filter is fitted on the detection window of the opaque drop photodetector 5 and transparent drop photodetector 6
10, the 635nm central wavelength light which only allows laser to be issued passes through, and then can to the stray light of other wavelength
It sponges, further avoids influence of the stray light to detector.The transparent drop photodetector 6 and the opaque drop
Photodetector 5 is all connected to the detectable signal processing equipment 7, and the alert device 8 is connected to the detectable signal processing
Equipment 7, the detectable signal processing equipment 7 is to transparent drop photodetector 6 and the input of opaque drop photodetector 5
Detectable signal is handled, and then determines that drop detected is transparent drop or opaque drop, and can handle simultaneously
It obtains the drippage state of drop, including dropleting speed, the information such as whether has dripped off, and mentioned when determining that drippage is abnormal to described
Equipment 8 of waking up issues enabling signal, carries out the prompting of drips abnormal state by the alert device 8.
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 conductive 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, draws opaque transparent liquid 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 visiting for handling 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 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
Device, the output end of first narrow band filter are 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
Device, the output end of second envelope detector are 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 the numerical value whether speed is faster than some setting under drop, or be slower than the number of some setting
Value, also judges out whether drop stops to drip, and different situations are generated with different alerting signals, realizes drop multi-motion shape
The detection of state is reminded, wherein the alert device preferably includes 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 realizing with other devices, drop-wise state under drop is transmitted to other devices.
Finally illustrate the working 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 issues 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 determine 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 by drop channel 2, when drop reaches laser-irradiated domain, laser
The laser beam that device 1 issues is irradiated on transparent drop 9, and transparent drop is equivalent to an optical lens at this time, plays to laser beam
Anaclasis effect so that laser be focused after critical dimensions quickly again, thus 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, thus when detectable signal processing equipment receives the letter of the high level from transparent drop photodetector 6
Number when determine to have transparent drop at this time through laser irradiation search coverage, 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 issues 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
Low level signal out, to determine 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 by drop channel 2, when opaque transparent liquid is dripped to up to laser irradiation area
When domain, the laser beam that laser 1 issues is irradiated on opaque drop and is stopped by opaque drop absorption, due to opaque transparent liquid
Drop blocks the optical path in laser illumination to opaque drop photodetector 5, so that opaque drop photodetection at this time
There is no light beam irradiation 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 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, thus when detectable signal processing equipment receives the high level from opaque drop photodetector 5
Determine have 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 lower drop of the present invention using optical method detection drop, when drop passes through in the optical path, due to
The refraction or absorption of drop will lead to the luminous intensity being irradiated on different detectors and 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, thus
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, also judges out whether drop stops to drip, and different situations are generated with different alerting signals, realize
The detection of drop multi-motion state is reminded.
The above is only the preferred embodiment of the present invention is described, technical solution of the present invention is not limited to
This, those skilled in the art's made any known deformation on the basis of major technique design of the invention belongs to the present invention
Claimed technology scope, the specific protection scope of the present invention are subject to the record of claims.
Claims (14)
1. a kind of drop optical detection apparatus characterized by comprising light source, opaque drop photodetector (5), transparent
Drop photodetector (6) and detectable signal processing equipment (7), the opaque drop photodetector (5) are in the light
On the output light path in source, the transparent drop photodetector (6) is close to side by side with the opaque drop photodetector (5)
Setting, the opaque drop photodetector (5) and transparent drop photodetector (6) are all connected at the detectable signal
It manages equipment (7)；Drop channel (2) be between the light source and photodetector, when do not have drop pass through drop channel (2)
When, the output beam of light source is only irradiated to the opaque drop photodetector (5)；When transparent drop passes through drop channel
(2) when, the output beam of light source can be irradiated to the opaque drop photodetector (5) after the refraction of transparent drop simultaneously
With transparent drop photodetector (6)；When opaque drop passes through drop channel (2), the output beam of light source is opaque
Liquid droplets intercept and the opaque drop photodetector (5) and transparent drop photodetector (6) can not be irradiated to；It is described not
The detection operations mechanism of transparent drop photodetector (5) and the transparent drop photodetector (6) is just the opposite.
2. drop optical detection apparatus according to claim 1, which is characterized in that the opaque drop photodetector
(5) low level signal output is generated in the light beam irradiation for receiving light source, the production in the light beam irradiation for being not received by light source
Raw high level signal output, the transparent drop photodetector (6) generate high level in the light beam irradiation for receiving light source
Signal output generates low level signal output in the light beam irradiation for being not received by light source；Or the opaque drop light
Electric explorer (5) generates high level signal output in the light beam irradiation for receiving light source, in the light beam for being not received by light source
Low level signal output, the transparent drop photodetector (6) production in the light beam irradiation for receiving light source are generated when irradiation
Raw low level signal output generates high level signal output in the light beam irradiation for being not received by light source.
3. drop optical detection apparatus according to claim 1, which is characterized in that it further include having diverging prism (4), it is described
Diverging prism (4) is set on the output light path of the light source, can be by the light beam of light source output by the diverging prism (4)
Diverging is linear type Line beam, and the Line beam after diverging will not be irradiated to the transparent drop photodetector (6), while institute
State transparent drop photodetector (6) along the Line beam diverging direction and the opaque drop photodetector (5) simultaneously
Row is close to setting.
4. drop optical detection apparatus according to claim 1, which is characterized in that the opaque drop photodetector
(5) and transparent drop photodetector (6) is the detector based on photodiode, and the opaque drop photodetection
Photodiode in device (5) is connected with the photodiode differential concatenation in the transparent drop photodetector (6).
5. drop optical detection apparatus according to claim 4, which is characterized in that the opaque drop photodetector
(5) include the first photodiode and first resistor, the transparent drop photodetector (6) include the second photodiode and
Second resistance, the negative pole end of second photodiode are connected to high voltage end, the positive terminal of second photodiode
It is connected to one end of the second resistance, the other end of the second resistance is connected to low-voltage end, in second photoelectricity two
The detectable signal output end of the transparent drop photodetector (6) is drawn between the positive terminal of pole pipe and the second resistance；
The positive terminal of first photodiode is connected to low-voltage end, and the negative pole end of first photodiode is connected to described
One end of first resistor, the other end of the first resistor are connected to the high voltage end, in first photodiode
The detectable signal output end of the opaque drop photodetector (5) is drawn between negative pole end and the first resistor, it is described
First photodiode and the second photodiode are in the conductive state in the output beam for receiving light source.
6. drop optical detection apparatus according to claim 5, which is characterized in that when the laser for not having drop to reach light source
When irradiation area, the opaque drop photodetector (5) and transparent drop photodetector (6) export low level letter
Number；When transparent liquid is dripped to up to the laser-irradiated domain of light source, opaque drop photodetector (5) the output low level letter
Number, the transparent drop photodetector (6) export high level signal；When opaque transparent liquid drips to the laser-irradiated domain up to light source
When, opaque drop photodetector (5) the output high level signal, transparent drop photodetector (6) output are low
Level signal.
7. drop optical detection apparatus according to claim 1-6, which is characterized in that the detectable signal processing
Equipment (7) includes signal amplifier (12), narrow band filter (13), envelope detector (14), waveform shaper (15) and micro- place
It manages device (16), the signal amplifier (12) is connected to the detectable signal output end of the photodetector, the signal amplification
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 packet
The output end of network wave detector (14), 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).
8. drop optical detection apparatus according to claim 7, 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 is 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 handled, and first signal amplifier is connected to the opaque transparent liquid
Drip the detectable signal output end of photodetector (5)；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 the detection of transparent drop photodetector (6)
Signal, and the second signal amplifier is connected to the detectable signal output end of the transparent drop photodetector (6)；It is described
The drop detectable signal that microprocessor can be exported based on photodetector, which calculates, drips frequency under drop, and can determine under drop
Drop speed whether deviates preset critical field and whether drop stops to drip, while can externally export drop exception control letter
Number.
9. according to claim 1 any one of -6 or drop optical detection apparatus according to any one of claims 8, which is characterized in that also
It include narrow band filter (10) and/or alert device (8), the narrow band filter (10) is respectively arranged at the opaque transparent liquid
Drip the detection window of photodetector (5) and transparent drop photodetector (6), and the band logical wave of the narrow band filter (10)
The central wavelength of a length of light source；The alert device (8) is connected to the detectable signal processing equipment (7), and includes
Alarm and/or state display lamp (17).
10. according to claim 1 any one of -6 or drop optical detection apparatus according to any one of claims 8, which is characterized in that institute
Stating light source is the semiconductor laser that center wavelength is 2mW in 635nm, mean power, and the semiconductor laser is modulated
It is exported at the quasi-continuous lasing of 10KHz.
11. drop optical detection apparatus according to claim 3, which is characterized in that the diverging prism (4) is Bao Weier
Prism.
12. drop optical detection apparatus according to claim 7, which is characterized in that the light source is that center wavelength exists
635nm, the semiconductor laser that mean power is 2mW, and the semiconductor laser is modulated into the quasi-continuous lasing of 10KHz
Output, the centre frequency of the narrow band filter (13) is 10KHz.
13. drop optical detection apparatus according to claim 9, which is characterized in that the light source is that center wavelength exists
635nm, the semiconductor laser that mean power is 2mW, and the semiconductor laser is modulated into the quasi-continuous lasing of 10KHz
Output, the band-pass wavelength of the narrow band filter are 635nm.
14. according to claim 1 any one of -6 or drop optical detection apparatus according to any one of claims 8, which is characterized in that institute
Transparent drop photodetector (6) is stated to be close to side by side along the drippage direction of drop with the opaque drop photodetector (5)
Setting.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710063770.4A CN108387943B (en) | 2017-02-03 | 2017-02-03 | A kind of drop optical detection apparatus |
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| CN201710063770.4A CN108387943B (en) | 2017-02-03 | 2017-02-03 | A kind of drop optical detection apparatus |
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| CN108387943B true CN108387943B (en) | 2019-11-12 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109142461B (en) * | 2018-10-25 | 2020-10-13 | 浙江三尼科技有限公司 | Solution drop type detection device and method |
| CN109827877A (en) * | 2019-03-14 | 2019-05-31 | 张乐翔 | Streaming drop optical measurement instrument and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH11326185A (en) * | 1998-05-12 | 1999-11-26 | Nippon Sheet Glass Co Ltd | Liquid drop detection apparatus |
| CN1140789C (en) * | 2001-06-19 | 2004-03-03 | 天津大学 | Optical imaging drop analyzer based on the volume of drop |
| CN202516077U (en) * | 2011-07-09 | 2012-11-07 | 李文杰 | Medical digital display dripping stop warner for monitoring transfusion |
| JP5901012B2 (en) * | 2012-02-13 | 2016-04-06 | 国立大学法人 東京医科歯科大学 | Blood information measuring method and apparatus |
| CN204086579U (en) * | 2014-09-30 | 2015-01-07 | 东莞市恒生传感器有限公司 | A kind of liquid detection sensor |
| CN106139319A (en) * | 2016-06-28 | 2016-11-23 | 谢骞 | A kind of transfusion drip speed control system |
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