CN104655525A - Specific gravity hydrometer - Google Patents
Specific gravity hydrometer Download PDFInfo
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- CN104655525A CN104655525A CN201510031683.1A CN201510031683A CN104655525A CN 104655525 A CN104655525 A CN 104655525A CN 201510031683 A CN201510031683 A CN 201510031683A CN 104655525 A CN104655525 A CN 104655525A
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Abstract
The invention is applicable to the field of measuring instruments, and provides a specific gravity hydrometer. The specific gravity hydrometer comprises a light source, a first conduction component, a first detector, a second detector, a processing module, and a second conduction component provided with a sensing part, wherein light emitted by the light source is coupled to the first detector by the first conduction component, and passes through the sensing part to form sensing light with specific gravity information of a to-be-detected liquid; the sensing light is coupled to the second detector by the second conduction component; the first detector and the second detector are connected with the processing module; two light signals are processed by the detectors and then sent to the processing module; and the processing module is used for performing operation processing on the two optical signals, obtaining a rate of specific gravity according to a corresponding relation between a prestored liquid specific gravity value and an operation result and outputting the rate of specific gravity. The specific gravity hydrometer adopts an optical fiber surface plasma resonance technology or a micro-nano optical fiber technology, so that no manual intervention is required in the measuring process; the operation is simple and convenient; the amount of sample consumption is less; the volumes of the sensors are reduced; and the measuring sensitivity and the resolution capacity are improved.
Description
Technical field
The invention belongs to measuring instrument field, particularly relate to a kind of liquid specific gravity instrument.
Background technology
Have a lot for surveying tintometric instrument in the market, medical refractometer operation wherein and reading are all artificial process, may bring larger human error; Also have some liquid electronic proportion instrument, operate consuming time, consumption liquid, loaded down with trivial details, and be easily affected by the external environment.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of liquid specific gravity instrument, aim to provide that a kind of volume is little, sensitivity and resolution is high, need not manually-operated liquid specific gravity instrument.
The invention provides a kind of liquid specific gravity instrument, comprising:
Light source;
First detector, for being converted into the first electric signal by the reference optical signal received;
Second detector, for being converted into the second electric signal by the sense light received signal;
First conducting subassembly, is connected between described light source and described first detector, conducts to described first detector for the light sent by described light source as with reference to light;
Second conducting subassembly, be connected between described light source and described second detector, it has a detecting means, and described detecting means is coated with testing liquid, and the light that light source sends obtains the sense light carrying testing liquid proportion information after described detecting means effect; Described second conducting subassembly is used for described sense light to conduct to described second detector;
Processing module, being connected with described first detector, the second detector simultaneously, for doing calculation process to described first electric signal, the second electric signal, and obtaining the rate of specific gravity of testing liquid according to the corresponding relation between the flowing fluid ratio weight values prestored and operation result.
Further, described detecting means surface is with the metal level that can produce surface plasma; The sense light that plasma resonance effect obtains carrying testing liquid proportion information is there is in the light of described second conducting subassembly conduction in detecting means.
Further, described detecting means is micro-nano fiber, and the light that described light source sends obtains through described detecting means the sense light carrying testing liquid proportion information.
Further, when described light source is white light source, the result resonance absorbing peak of described calculation process characterizes, and processing module obtains rate of specific gravity according to shake the together corresponding relation of absorption peak position of the flowing fluid ratio weight values prestored and exports.
Further, the light of described second conducting subassembly conduction leaks out by described detecting means, and the detecting means of described second conducting subassembly is that the bare fibre of covering or side rubbing down optical fiber or tapered fiber or fiber grating or luminous energy arrive waveguide and the interfacial optical waveguide of external environment condition.
Further, described metal level is nano level metal simple-substance or compound substance.
Further, described light source is white light source or monochromatic source.
Further, described calculation process is ratio proccessing or difference process.
Further, the testing liquid in described detecting means is static liquid or fluid.
The present invention compared with prior art, beneficial effect is: a kind of liquid specific gravity instrument provided by the invention, adopt Applications of surface plasmon resonance or micro-nano fiber technology, measuring process is without the need to manual intervention, easy and simple to handle, consumption sample amount is few, and greatly reduces the volume of sensor, improves measurement sensistivity and resolution characteristic.
Accompanying drawing explanation
Fig. 1 is the liquid specific gravity instrument structural representation that the embodiment of the present invention provides;
Fig. 2-Fig. 4 is the accompanying drawings having the liquid specific gravity instrument of the metal level that can produce surface plasma based on detecting means surface that the embodiment of the present invention provides; Wherein,
Fig. 2 be the proportion instrument that provides of the embodiment of the present invention when adopting white light source, the middle schematic diagram producing resonance absorbing peak of normalization detecting light spectrum (ratio of the spectrum that the second detector and the first detector detect);
Fig. 3 be the proportion instrument that provides of the embodiment of the present invention when adopting white light source, the lowest point of resonance absorbing peak is with the schematic diagram of liquid specific gravity Changing Pattern;
Fig. 4 be the proportion instrument that provides of the embodiment of the present invention when adopting the monochromatic source in 650-700nm wavelength coverage, light intensity is with the schematic diagram of liquid specific gravity Changing Pattern;
Fig. 5 to be detecting means that the embodiment of the present invention provides be liquid specific gravity instrument of micro-nano fiber is when adopting the monochromatic source in 650-700nm wavelength coverage, and light intensity is with the schematic diagram of liquid specific gravity Changing Pattern.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The invention provides a kind of liquid specific gravity instrument, as shown in Figure 1, comprise light source 1, first detector 2, second detector 3, first conducting subassembly 4, second conducting subassembly 5, processing module 6, described first conducting subassembly 4 is reference optical fiber, and described second conducting subassembly 5 is sensor fibre, and described second conducting subassembly 5 is provided with detecting means 7, described detecting means 7 is coated with testing liquid, for sensing the proportion of testing liquid; The light that described light source 1 sends is coupled to described first detector 2 by described first conducting subassembly 4, simultaneously, the light that described light source 1 sends obtains the sense light carrying testing liquid proportion information after described detecting means 7 acts on, and described sense light is coupled to described second detector 3 by described second conducting subassembly 5; Described first detector 2 and the second detector 3 are connected with described processing module 6, for respectively the light signal on described first conducting subassembly 4 and the second conducting subassembly 5 being converted into electric signal and being sent to described processing module 6; Described processing module 6 is done calculation process for the electric signal received described second detector 3 and the first detector 2 and is obtained rate of specific gravity according to the corresponding relation between the flowing fluid ratio weight values prestored and the result of described calculation process and export; Wherein, described calculation process is ratio or difference process.
Following two kinds of forms are comprised about detecting means 7:
Form one: for detecting means 7, to the detecting means 7 of the second conducting subassembly 5 through optical fiber micro Process, the luminous energy that detecting means 7 conducts is leaked, and detecting means 7 can be that the bare fibre of covering or side rubbing down optical fiber or tapered fiber or fiber grating or luminous energy arrive waveguide and the interfacial optical waveguide of external environment condition etc.; Need the nano level metal level of deposition one deck through micro-machined Fibre Optical Sensor portion 7 outside surface, this metal level can be metal simple-substance or the compound substance that efficiently can produce surface plasma simultaneously.The light that second conducting subassembly 5 conducts can excite the plasma in detecting means 7 surface metal-layer, and produces the resonance absorption of light, obtains sense light thus.The liquid of different specific weight can make resonance signal change, and obtains different sense light thus; Applications of surface plasmon resonance is a kind of physioptial absorbing phenomenon, in fact, Applications of surface plasmon resonance is proved to be a kind of supersensitive variations in refractive index detection means, and liquid specific gravity change also can cause the change of its refractive index, so this technology can detect that liquid specific gravity changes delicately.
Below the liquid specific gravity instrument based on this detecting means form is specifically introduced for two example two:
Embodiment one: adopt spectral detection, the light that light source produces is wideband white, detector adopts spectrometer, under the environment meeting resonant condition, a resonance absorbing peak is there will be in normalization spectrum (ratio of the spectrum that the second detector and the first detector detect), be illustrated in figure 2 detecting means surface and have the liquid specific gravity instrument of the metal level that can produce surface plasma when adopting white light source, in normalization spectrum, produce the schematic diagram of resonance absorbing peak; This resonance absorption peak energy is moved with the proportion change of liquid delicately, what its corresponding detector detected is that resonance absorption peak position is with tintometric change, when adopting white light source, the lowest point of resonance absorbing peak with tintometric Changing Pattern as shown in Figure 3.The specific works process of liquid specific gravity instrument is: the wideband white that light source sends is coupled to described first detector 2 by the first conducting subassembly 4, simultaneously, the second detector 3 is coupled to by described second conducting subassembly 5, the detecting means 7 that described second conducting subassembly 5 is arranged is for being coated with the bare fibre removing covering of metal level, and the light that the second conducting subassembly 5 conducts at described detecting means 7, plasma resonance effect can occur, described first detector 2 and the second detector 3 are connected with described processing module 6, processing module 6 controls the first detector 2 and the second detector 3 carries out denoising to the signal detected separately, Integral Processing, these control two paths of signals again and go to do ratio or difference process (ratio or difference process also can further stress release treatment) after all processing, the result resonance absorbing peak of ratio or difference process here characterizes, the change in location of resonance absorbing peak just can the change of reaction liquid proportion, last processing module obtains rate of specific gravity according to shake the together corresponding relation of absorption peak position of the flowing fluid ratio weight values prestored and exports.
Embodiment two: adopt light-intensity test, the light that light source produces is monochromatic light, what its corresponding detector detected is exactly the tintometric change of light intensity absorption intensity, and the first detector and the second detector can be photodiodes, also can be photoresistance.Be illustrated in figure 4 detecting means surface and have the liquid specific gravity instrument of the metal level that can produce surface plasma when adopting the monochromatic source in 650-700nm wavelength coverage, normalization light intensity (ratio of the light intensity that the second detector and the first detector detect) the tintometric Changing Pattern of intensity.The specific works process of liquid specific gravity instrument is: monochromatic source is coupled to described first detector 2 by described first conducting subassembly 4, meanwhile, is coupled to the second detector 3 by described second conducting subassembly 5; The detecting means 7 that described second conducting subassembly 5 is arranged is for being coated with the bare fibre removing covering of metal level, and the light that the second conducting subassembly 5 conducts at described detecting means 7, plasma resonance effect can occur; The light signal detected is converted to electric signal by the first detector 2 and the second detector 3, and the electric signal then exported enters processing module; Processing module 6 carries out denoising, Integral Processing to two signals, these all process and remake ratio or difference process (ratio or difference process also can further stress release treatment), the power of this ratio or difference changes the change of just energy reaction liquid proportion, and last processing module obtains rate of specific gravity according to the corresponding relation between the flowing fluid ratio weight values prestored and described ratio or difference and exports.
Form two: detecting means 7 is micro-nano fiber; Micro-nano fiber itself is the equal of fibre core, and the testing liquid covering micro-nano fiber surface is just equivalent to covering, testing liquid is different, and the constraint ability of micro-nano fiber to the light conducted wherein is also different, also just different by luminous energy remaining after micro-nano fiber, just obtain different sense light thus.
Below lift the liquid specific gravity instrument of a specific embodiment introduction based on this detecting means form:
Micro-nano fiber is the optical fiber of a kind of diameter in micron, nanometer scale, and the methods such as it can be stretched by flame or other heat source by normal silicon oxides or polymer optical fiber, electron beam lithography is sent out, laser ablation, chemical corrosion obtain.For ordinary optic fibre, generally by fibre core-cladding structure light is strapped in fibre core and transmits, fibre core is surrounded by covering (covering is difficult to remove), and fibre core and covering exist certain refringence (fiber core refractive index is high); And for micro-nano fiber, itself be the equal of fibre core, the surrounding medium covering micro-nano fiber surface is just equivalent to covering, and covering is at this moment exactly the variable medium of one deck, and when overwrite media changes, the constraint ability of micro-nano fiber to light also changes.When overwrite media and micro-nano fiber refringence more hour, the constraint ability of micro-nano fiber to light is more weak, luminous energy so by remaining after micro-nano fiber is fewer, so the refractive index being judged overwrite media by the luminous energy of micro-nano fiber can be detected, the proportion change of Covering Liguid can cause the change of its refractive index, namely adopts micro-nano fiber can detect the proportion change of liquid delicately as detecting means.Adopt light-intensity test below, the light that light source produces is monochromatic light, particularly, being illustrated in figure 5 detecting means is the liquid specific gravity sensor of micro-nano fiber when adopting the monochromatic source in 650-700nm wavelength coverage, normalization light intensity (ratio of the light intensity that the second detector and the first detector detect) the tintometric Changing Pattern of intensity.Operationally, first conducting subassembly 4 and the second conducting subassembly 5 receive the light that same light source sends simultaneously, when liquid covers the detecting means 7 of sensor fibre, detect and just can obtain sense light by the luminous energy after micro-nano fiber, the light that described first conducting subassembly 4 conducts by the first detector 2 and the second detector 3 respectively and described sense light are converted into electric signal and are sent to described processing module 6; Described processing module 6 does ratio to described electric signal or difference process also obtains rate of specific gravity according to the corresponding relation between the flowing fluid ratio weight values prestored and described ratio or difference and exports.
A kind of liquid specific gravity instrument provided by the invention, operational modulation mode can be wavelength-modulated, intensity modulation, phase-modulation etc., whole process is without the need to manual intervention, easy and simple to handle, and reduce the volume of sensor greatly, improve measurement sensistivity and resolution characteristic; In addition, sensor senses process can be static, and consumption sample amount is few, and several, as long as can cover detecting means, can be also fluid, realizes real-time online and detects.In fact, Applications of surface plasmon resonance and micro-nano fiber technology have been widely used and the detection of small variations in refractive index, as the detection of biochemical reaction process.And optical fiber surface plasmon resonance body technology is also applied to the detection of strength of fluid, the detection of environmental wastewater pollution level, the detection etc. of harmful gas, the change procedure monitoring of the real-time online of above application even can be made.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a liquid specific gravity instrument, is characterized in that, comprising:
Light source;
First detector, for being converted into the first electric signal by the reference optical signal received;
Second detector, for being converted into the second electric signal by the sense light received signal;
First conducting subassembly, is connected between described light source and described first detector, conducts to described first detector for the light sent by described light source as with reference to light;
Second conducting subassembly, be connected between described light source and described second detector, it has a detecting means, and described detecting means is coated with testing liquid, and the light that light source sends obtains the sense light carrying testing liquid proportion information after described detecting means effect; Described second conducting subassembly is used for described sense light to conduct to described second detector;
Processing module, being connected with described first detector, the second detector simultaneously, for doing calculation process to described first electric signal, the second electric signal, and obtaining the rate of specific gravity of testing liquid according to the corresponding relation between the flowing fluid ratio weight values prestored and operation result.
2. liquid specific gravity instrument as claimed in claim 1, is characterized in that, the detecting means of described second conducting subassembly is that the bare fibre of covering or side rubbing down optical fiber or tapered fiber or fiber grating or luminous energy arrive waveguide and the interfacial optical waveguide of external environment condition; Described detecting means surface is with the metal level that can produce surface plasma; The sense light that plasma resonance effect obtains carrying testing liquid proportion information is there is in the light of described second conducting subassembly conduction in detecting means.
3. liquid specific gravity instrument as claimed in claim 1, it is characterized in that, described detecting means is micro-nano fiber, and the light that described light source sends obtains through described detecting means the sense light carrying testing liquid proportion information.
4. liquid specific gravity instrument as claimed in claim 2, it is characterized in that, when described light source is white light source, the result resonance absorbing peak of described calculation process characterizes, and processing module obtains rate of specific gravity according to shake the together corresponding relation of absorption peak position of the flowing fluid ratio weight values prestored and exports.
5. liquid specific gravity instrument as claimed in claim 2, it is characterized in that, described metal level is nano level metal simple-substance or compound substance.
6. liquid specific gravity instrument as claimed in claim 1, it is characterized in that, described light source is white light source or monochromatic source.
7. liquid specific gravity instrument as claimed in claim 1, it is characterized in that, described calculation process is ratio proccessing or difference process.
8. liquid specific gravity instrument as claimed in claim 1, is characterized in that, the testing liquid in described detecting means is static liquid or fluid.
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| CN201510031683.1A CN104655525A (en) | 2015-01-22 | 2015-01-22 | Specific gravity hydrometer |
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| CN201510031683.1A CN104655525A (en) | 2015-01-22 | 2015-01-22 | Specific gravity hydrometer |
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Cited By (2)
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| CN108387555A (en) * | 2018-01-22 | 2018-08-10 | 陈郁芝 | A kind of multi-cascade plasma resonance sensing system |
| CN109030412A (en) * | 2018-04-24 | 2018-12-18 | 江南大学 | A kind of measuring device for liquid refractive index and its method based on DVD optical grating construction |
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| CN109030412A (en) * | 2018-04-24 | 2018-12-18 | 江南大学 | A kind of measuring device for liquid refractive index and its method based on DVD optical grating construction |
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