CN102128810A - Seawater salinity detection device with prism model capable of refracting for multiple times - Google Patents
Seawater salinity detection device with prism model capable of refracting for multiple times Download PDFInfo
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- CN102128810A CN102128810A CN 201010603445 CN201010603445A CN102128810A CN 102128810 A CN102128810 A CN 102128810A CN 201010603445 CN201010603445 CN 201010603445 CN 201010603445 A CN201010603445 A CN 201010603445A CN 102128810 A CN102128810 A CN 102128810A
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Abstract
The invention relates to a seawater salinity detection device with a prism model capable of refracting for multiple times, which comprises an upper computer, a right-angle prism and a signal acquisition and processing module; optical glass which is perpendicular to an emitting light path of a laser and two pieces of optical glass which form a group of prism models in a mode of forming an acute angle alpha 1 and an obtuse angle beta 1 with the emitting light path of the laser are arranged below the laser and a position sensitive device, and two pieces of optical glass, which form a group of prism models and form an acute angle alpha 2 and an obtuse angle beta 2 with the opposite direction of the emitting light path of the laser respectively, are arranged above the right-angle prism sequentially; and the optical glass and a shell of the device enclose an upper closed reference cavity filled with reference liquid, and the optical glass and a shell at the bottom end of the device enclose a lower closed reference cavity which is provided with the right-angle prism and filled with the reference liquid. The seawater salinity detection device has a simple structure and is convenient to use, and due to the adoption of the prism models, the deflection angles of light rays are expanded, the resolution, accuracy and interference resistant capacity are improved, the length of the instrument is shortened, and the equipment cost and measuring cost are reduced.
Description
Technical field
The present invention relates to a kind of seawater salinity pick-up unit, relate in particular to a kind of seawater salinity pick-up unit of prism models for several times refraction, belong to photoelectric sensing, marine environmental monitoring field.
Background technology
Seawater salinity detects except electrical conductivity method, the main Photoelectric Detection of light refraction of utilizing in addition to seawater salinity, be that light refraction method seawater salinity detects, its ultimate principle is to utilize the testing liquid salinity to change to cause that transmission anaclasis angle changes the detection that the character that causes the skew of receiving end light realizes seawater salinity.At present, Photoelectric Detection to seawater salinity, external representative be the people such as Hideyuki Minato of Japan propose do light source with semiconductor laser, transmit the transmission-type salinity sensor of light signal with optical fiber, its shortcoming is that to transmit signal process at a distance loaded down with trivial details and volume ratio is bigger.Domestic, the fiber optic sensor system that is used for ocean temperature and salinity real-time detection simultaneously of people such as the Zhao Yong of Tsing-Hua University proposition in 2002, and be improved to the photoelectric method seawater salinity detection system of position-based Sensitive Apparatus (PSD) in 2009, carried out the principle experimental study, the resolution that salinity detects is 1.67 ‰, and the actual request for utilization of distance is also lower; A kind of transmittance new liquid concentration detection apparatus that adopts two isolation window of propositions such as Li Tianze in 2009, error approximately is 8%, error is also bigger.As seen the accuracy of detection of said method is all lower, and analysis-by-synthesis, the light path of above-mentioned detection method all are the parallel flat models, after the light generation unirefringence, detects.Existing light refraction method seawater salinity detection technique as shown in Figure 4, among Fig. 5 (the light path stretch-out view of Fig. 4), measurement liquid between the two blocks of optical glass that are parallel to each other in front and back can be thought parallel flat, deflection angle when incident ray enters measurement liquid by reference liquid is by reference liquid and the refractive index decision of measuring liquid, the side-play amount that arrives on the PSD is determined by the distance between deflection angle and the front and back optical mirror slip, light all is directional light in reference liquid, can't improve the side-play amount of system, this shows, this model only reflects once, even polylith collimating optics glass is set in system, model still is a parallel flat, can not effectively improve deflection angle, therefore, for improving resolving power, must increase light path, this must make instrument bulky, and increase light path the stability of system is caused adverse effect, and as seen this method detects resolving power and accuracy is difficult improves.
Summary of the invention
The seawater salinity pick-up unit that the purpose of this invention is to provide a kind of prism models for several times refraction is to overcome the low deficiency of present light refraction method seawater salinity pick-up unit accuracy of detection.
Technical conceive of the present invention is: utilize the prism model that has bigger deflection angle with respect to the parallel flat model, by a plurality of refractions unit is set, enlarged the deflection angle of device, with raising detection sensitivity and accuracy, and shorten light path, reduced the instrument volume.
A kind of seawater salinity pick-up unit of prism models for several times refraction, comprise the right-angle prism that is located at this bottom of device, with be located at this device top signal process chamber in pass through signals collecting and the processing module that cable is connected with host computer, described signals collecting and processing module are connected with laser instrument and position sensitive detector PSD respectively, and below laser instrument and position sensitive detector, be provided with the optical glass vertical, it is characterized in that above-mentioned optical glass is sharp angle to being provided with successively between the right-angle prism with the laser emitting light path with the laser emitting light path
1And obtuse angles beta
1Two optical glass of one group of prism model of formation; And be sharp angle at right-angle prism to the reverse direction that is provided with successively between the optical glass with the laser emitting light path
2And obtuse angles beta
2The optical glass of one group of prism model of formation; The housing of described optical glass and device is encircled into the last reference cavity of filling with reference to the sealing of liquid, and the housing of described optical glass and device bottom is encircled into and includes right-angle prism and fill following reference cavity with reference to the sealing of liquid; Be provided with the protection network that is fixed in housing between the described upper and lower reference cavity.
In order further to have enlarged the deflection angle of device, to improve detection sensitivity and accuracy, and shortening light path, reduced the instrument volume, a plurality of refractions unit can be set, to set up a middle reference cavity between the above-mentioned upper and lower reference cavity again, promptly in reference cavity comprise two from top to bottom successively with laser emitting light path β in obtuse angle
1And sharp angle
1Optical glass, and two from bottom to top successively with the reverse direction of laser emitting light path β in obtuse angle
2And sharp angle
2Optical glass; Described optical glass is encircled into the cavity of filling with reference to the sealing of liquid with the housing of device side; And be equipped with the protection network that is fixed in housing between reference cavity and the upper and lower reference cavity in being somebody's turn to do.
In order to reach desirable refraction effect, above-mentioned sharp angle
1Or α
2In 20～70 degree scopes, above-mentioned obtuse angles beta
1Or β
2In 110～160 degree scopes; Further, above-mentioned sharp angle
1, α
2And obtuse angles beta
1, β
2Being respectively 45 degree makes two adjacent optical glass of the left and right sides vertical mutually with 135 degree.
Above-mentioned optical glass can be quartz glass, and is corrosion-resistant withstand voltage, is fit to the deep water ocean and uses.Refractive index all can be used as with reference to liquid with the approaching alcohol of seawater, glycerine, phenixin, distilled water etc., yet, discover, select the distilled water of wide material sources for use with reference to liquid, seawater is measured optimum, therefore with reference to the preferred distilled water of liquid.
Between the upper and lower reference cavity or the part between middle reference cavity and the upper and lower reference cavity will have seawater to enter as measuring the chamber.
Measuring process of the present invention is: the light that laser instrument sends, impinge perpendicularly on the optical glass vertical of its below with the laser emitting light path, pass the reference liquid of reference cavity, arrive second block of optical glass, just with reference to liquid when measuring the interface of liquid, owing to reference to liquid with measure that liquid medium is different to be reflected, pass the measurement liquid of measuring the chamber more successively, middle reference cavity, under measure the chamber, the reference liquid of following reference cavity arrives right-angle prism, after right-angle prism turns to, pass down successively again and measure the chamber, middle reference cavity, last measurement chamber, behind the last reference cavity, arrive the PSD receiving plane, the variation of light spot position calculates the salinity value of measuring liquid on the PSD receiving plane through related software after signals collecting and processing module processing.
Wherein, measurement chamber between reference cavity all has the optical glass of reference cavity up and down, and optical glass is in a certain angle, owing to measure liquid (seawater) density ratio with reference to liquid (distilled water) height, then measure the chamber and form the prism model, the deflection angle that light passes behind the measurement chamber is more a lot of greatly than parallel flat model.Light whenever passes a prism model, and deflection angle all enlarges once, and unlike the parallel flat model, even if a plurality of parallel flat models are set, can not significantly enlarge deflection angle.Therefore, a plurality of prism models are set, after repeatedly reflecting, have enlarged the deflection angle of light, increased the side-play amount of emergent ray luminous point on the PSD photosurface, thereby improved the resolving power of system.
Obviously, the present invention is simple in structure, easy to use, be easy to carry, adopt the prism model, improved the side-play amount of light, significantly improve the resolving power of system, obtained measurement result accurately, saved Measuring Time, shorten the length of instrument simultaneously, reduced equipment cost, transportation cost and measurement cost.
Description of drawings
Fig. 1 is the two groups of prism structure of models synoptic diagram that have of the present invention.
Fig. 2 is the four groups of prism structure of models synoptic diagram that have of the present invention.
Fig. 3 is one group of prism structure of models synoptic diagram of the present invention.
Fig. 4 is the seawater salinity pick-up unit structural representation of existing parallel flat model.
Fig. 5 is the light path stretch-out view of Fig. 4.
Fig. 6 is the light path stretch-out view of Fig. 1.
Fig. 7 is the light path stretch-out view of Fig. 2.
Fig. 8 is a detection effect synoptic diagram of the present invention.
Wherein, 1, the signal Processing chamber, 2, go up reference cavity, 3, middle reference cavity, 4, following reference cavity, 5, cable, 6, weather proof receptacle, 7, laser instrument, 8, position sensitive detector, 9, optical glass, 10, with reference to liquid, 11, measure liquid, 12, shell, 13, protection network, 14, right-angle prism, 15, host computer, 16, signals collecting and processing module, 17～24, optical glass, n
0, with reference to the refractive index of liquid, n
1, measure the refractive index of liquid, n
g, optical glass refractive index.
Embodiment
Prism model of the present invention as shown in Figure 3, two optical glass in a certain angle 17,18 and the measurement liquid in the middle of it 12 constitute one group of prism model.
As shown in Figure 1, the present invention includes the right-angle prism 14 that is located at bottom of device, with be located at this device top signal process chamber 1 in pass through signals collecting and the processing module 16 that cable 5 is connected with host computer 15, described signals collecting and processing module 16 are connected with laser instrument 7 and position sensitive detector 8 respectively, and below laser instrument 7 and position sensitive detector 8, be provided with the optical glass 9 vertical, it is characterized in that above-mentioned optical glass 9 is sharp angle to being provided with successively between the right-angle prism 14 with laser instrument 7 emitting light paths with laser instrument 7 emitting light paths
1And obtuse angles beta
1Two optical glass 17,18 of one group of prism model of formation; And be sharp angle at right-angle prism 14 to the reverse direction that is provided with successively between the optical glass 9 with laser instrument 7 emitting light paths
2And obtuse angles beta
2The optical glass 19,20 of one group of prism model of formation; The housing 12 of described optical glass 9,17,20 and device is encircled into the last reference cavity of filling with reference to the sealing of liquid 10 2, and described optical glass 18,19 and the housing 12 that installs the bottom are encircled into and include right-angle prism 14 and fill following reference cavity 4 with reference to the sealing of liquid 10; Be provided with the protection network 13 that is fixed in housing 12 between the described upper and lower reference cavity 2,4.
As shown in Figure 2, in order further to have enlarged the deflection angle of device, to improve detection sensitivity and accuracy, and shortening light path, reduced the instrument volume, a plurality of refractions unit can be set, as also being provided with a middle reference cavity 3 between the above-mentioned upper and lower reference cavity 2,4, promptly in reference cavity 3 comprise two from top to bottom successively with laser instrument 7 emitting light paths β 1 and sharp angle in obtuse angle
1 Optical glass 21,22, and two from bottom to top successively with the reverse direction of laser instrument 7 emitting light paths β in obtuse angle
2And sharp angle
2 Optical glass 23,24; Described optical glass 21～24 is encircled into the cavity of filling with reference to the sealing of liquid 10 with the housing 12 of device side; And be equipped with the protection network 13 that is fixed in housing 12 between reference cavity 3 and the upper and lower reference cavity 2,4 in being somebody's turn to do; Thereby the quantity that makes the prism model reaches 4 groups.
In order to reach desirable refraction effect, above-mentioned sharp angle
1Or α
2In 20～70 degree scopes, above-mentioned obtuse angles beta
1Or β
2In 110～160 degree scopes; Further, above-mentioned sharp angle
1, α
2And obtuse angles beta
1, β
2Be respectively 45 degree and make two adjacent optical glass of the left and right sides vertical mutually, thereby be convenient to processing and assembling with 135 degree.
Above-mentioned optical glass can be quartz glass; Above-mentioned with reference to liquid 10 preferred distilled water.
Solid line be a light path during with reference to liquid for measuring the chamber among Fig. 1, at this moment, measurement liquid and be all with reference to liquid with reference to liquid, light transmits in a kind of medium, does not reflect; Dotted line is the light path when measuring the chamber for measurement liquid, at this moment, owing to not being with a kind of medium with reference to liquid with measuring liquid, reflects so send out upward; By Fig. 6,7 as can be known, refraction side-play amount h of the present invention
yMore existing flat plate model obviously increases.
As shown in Figure 2, adopt the device that has 4 groups of prism models that comprises signal Processing chamber 1, goes up reference cavity 2, middle reference cavity 3 and following reference cavity 4.Laser instrument 7, PSD and signals collecting and processing module 16 are set in the signal Processing chamber 1, and wherein PSD can be welded on signals collecting and the processing module 16, and is controlled by signals collecting and processing module 16 with laser instrument 7.Cable 5 links to each other with processing module 16 by 1 signals collecting in weather proof receptacle 6 and the signal Processing chamber, to circuit board power supply and and host computer 15 communications.All fill with as distilled water in three reference cavities with reference to liquid.Reach protection network between the reference cavity and enclose 13 one-tenth upward measurement chambeies and following measurement chambeies, measurement liquid (seawater) enters in this two measurements chamber by protection network.Protection network 13 prevents effectively that not only seawater biology and foreign material from entering the measurement chamber, and has blocked most of extraneous parasitic light, effectively overcomes the influence that system is subjected to extraneous parasitic light, has improved the adaptive capacity to environment of system.
Described laser instrument 7 is a semiconductor laser, output wavelength 650nm, and emergent pupil power 1mw, the beam diameter Φ 1mm at 1m place has and is fit to closely to use, and physical dimension is little, stable, the affected by environment advantage such as little of output intensity, and ruddiness is convenient to system debug.
Described PSD adopts Japanese shore pine S8543 one dimension PSD, and its photosurface is of a size of 0.7 * 24mm, and resolving power is 0.6um, has advantages such as high resolution, response speed are fast, low-power consumption, low cost, is fit to system and uses.
The angle of optical mirror slip and laser emitting light is 45 degree, during device length overall 600mm, measure the chamber seawater salinity and change at 40 o'clock by 0, the side-play amount of luminous point on the PSD photosurface is 20mm, be 5.4 times of parallel flat model, the resolution that salinity detects can reach 0.0012 ‰, apparently higher than existing pick-up unit.
Fig. 8 installs the repetition measurement curve of a certain measurement point for this, and as seen from the figure, this measurement device repeatability 2 σ are better than 0.05 ‰, and good stability.
Claims (9)
1. the seawater salinity pick-up unit of prism models for several times refraction, comprise the right-angle prism (14) that is located at this bottom of device, with signals collecting and the processing module (16) that cable (5) is connected with host computer (15) of passing through that is located in this device top signal process chamber (1), described signals collecting and processing module (16) are connected with laser instrument (7) and position sensitive detector (8) respectively, and be provided with the optical glass (9) vertical at laser instrument (7) with position sensitive detector (8) below, it is characterized in that above-mentioned optical glass (9) is sharp angle to being provided with successively between the right-angle prism (14) with laser instrument (7) emitting light path with laser instrument (7) emitting light path
1And obtuse angles beta
1Two optical glass (17,18) of one group of prism model of formation; And be sharp angle at right-angle prism (14) to the reverse direction that is provided with successively between the optical glass (9) with laser instrument (7) emitting light path
2And obtuse angles beta
2The optical glass (19,20) of one group of prism model of formation; The housing (12) of described optical glass (9,17,20) and device is encircled into the last reference cavity of filling with reference to the sealing of liquid (10) (2), and described optical glass (19,20) and the housing (12) that installs the bottom are encircled into and include right-angle prism (14) and fill following reference cavity (4) with reference to the sealing of liquid (10); Be provided with the protection network (13) that is fixed in housing (12) between the described upper and lower reference cavity (2,4).
2. pick-up unit as claimed in claim 1 is characterized in that also being provided with a middle reference cavity (3) between the above-mentioned upper and lower reference cavity (2,4), promptly in reference cavity (3) comprise two from top to bottom successively with laser instrument (7) emitting light path β in obtuse angle
1And sharp angle
1Optical glass (21,22), and two from bottom to top successively with the reverse direction of laser instrument (7) emitting light path β in obtuse angle
2And sharp angle
2Optical glass (23,24); Described optical glass (21～24) is encircled into the cavity of filling with reference to the sealing of liquid (10) with the housing (12) of device side; And be equipped with the protection network (13) that is fixed in housing (12) between reference cavity (3) and the upper and lower reference cavity (2,4) in being somebody's turn to do.
3. pick-up unit as claimed in claim 1 or 2 is characterized in that above-mentioned sharp angle
1Or α
2In 20～70 degree scopes.
4. pick-up unit as claimed in claim 1 or 2 is characterized in that above-mentioned obtuse angles beta
1Or β
2In 110～160 degree scopes.
5. pick-up unit as claimed in claim 1 or 2 is characterized in that above-mentioned sharp angle
1, α
2And obtuse angles beta
1, β
2Being respectively 45 degree makes two adjacent optical glass of the left and right sides vertical mutually with 135 degree.
6. detection system as claimed in claim 1 is characterized in that above-mentioned optical glass (9,17～20) is quartz glass.
7. detection system as claimed in claim 1 or 2 is characterized in that above-mentioned is distilled water with reference to liquid (10).
8. detection system as claimed in claim 1 or 2 is characterized in that above-mentioned laser instrument (7) is that output wavelength 650nm, emergent pupil power 1mw and the beam diameter at the 1m place are the semiconductor laser of Φ 1mm.
9. detection system as claimed in claim 1 is characterized in that above-mentioned position sensitive detector (8) is that model is the one dimension PSD of S8543.
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| CN2010106034450A CN102128810B (en) | 2010-12-24 | 2010-12-24 | Seawater salinity detection device with prism model capable of refracting for multiple times |
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|---|---|---|---|
| CN2010106034450A CN102128810B (en) | 2010-12-24 | 2010-12-24 | Seawater salinity detection device with prism model capable of refracting for multiple times |
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| CN102128810B CN102128810B (en) | 2012-05-30 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI498539B (en) * | 2013-01-10 | 2015-09-01 | Nat Applied Res Laboratories | Image-based diopter measuring system |
| CN105891434A (en) * | 2016-06-03 | 2016-08-24 | 深圳职业技术学院 | Seawater salinity online detection method and device |
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| JPH07229830A (en) * | 1994-02-15 | 1995-08-29 | Chubu Electric Power Co Inc | Prism unit and stuck salinity sensor |
| CN2551992Y (en) * | 2002-06-14 | 2003-05-21 | 清华大学 | Brine concentration measurer |
| JP2008203129A (en) * | 2007-02-21 | 2008-09-04 | Kyoto Electron Mfg Co Ltd | Salinity concentration meter |
| CN201909757U (en) * | 2010-12-24 | 2011-07-27 | 山东省科学院海洋仪器仪表研究所 | Seawater salinity detector with multiple-refraction prism models |
-
2010
- 2010-12-24 CN CN2010106034450A patent/CN102128810B/en not_active Expired - Fee Related
Patent Citations (4)
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| JPH07229830A (en) * | 1994-02-15 | 1995-08-29 | Chubu Electric Power Co Inc | Prism unit and stuck salinity sensor |
| CN2551992Y (en) * | 2002-06-14 | 2003-05-21 | 清华大学 | Brine concentration measurer |
| JP2008203129A (en) * | 2007-02-21 | 2008-09-04 | Kyoto Electron Mfg Co Ltd | Salinity concentration meter |
| CN201909757U (en) * | 2010-12-24 | 2011-07-27 | 山东省科学院海洋仪器仪表研究所 | Seawater salinity detector with multiple-refraction prism models |
Non-Patent Citations (3)
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| 《仪器仪表学报》 20050831 吴英才等 "基于表面等离子共振原理的一种新型盐度光学传感器" 参见期刊第818-821页 1-9 第26卷, 第8期 2 * |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI498539B (en) * | 2013-01-10 | 2015-09-01 | Nat Applied Res Laboratories | Image-based diopter measuring system |
| CN105891434A (en) * | 2016-06-03 | 2016-08-24 | 深圳职业技术学院 | Seawater salinity online detection method and device |
| CN105891434B (en) * | 2016-06-03 | 2017-09-26 | 深圳职业技术学院 | The online test method and its device of a kind of seawater salinity |
| US10876962B2 (en) | 2016-06-03 | 2020-12-29 | Shenzhen Polytechnic | Method and device for on-line detection of salinity of seater |
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