CN104215609A - Turbidity sensor - Google Patents
Turbidity sensor Download PDFInfo
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- CN104215609A CN104215609A CN201410222367.8A CN201410222367A CN104215609A CN 104215609 A CN104215609 A CN 104215609A CN 201410222367 A CN201410222367 A CN 201410222367A CN 104215609 A CN104215609 A CN 104215609A
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- light
- emitting component
- receiving element
- light receiving
- turbidity transducer
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Abstract
The invention provides a turbidity sensor with small size and simple structure, even though the configured spacing between a light-emitting element and an optical receiving element for detection is reduced due to the small size, the turbidity sensor can still compensate the change of light quantity of light-emitting element due to surrounding temperature change and the aging of the light-emitting element. The turbidity sensor 1 comprises a sensor body, the light-emitting element, the optical receiving element for detection, and an optical receiving device for compensation, the sensor body is light-shielding and provided with two hole portions, the two hole portions are provided with openings, the openings are arranged in an adjacent manner, the light-emitting element is arranged in one of the hole portions and emits light within a prescribed radiation angle range Theta, the optical receiving element for detection is arranged in the other hole portion and receives light emitted from the opening, and the optical receiving device for compensation is arranged in one of the hole portions and receives the light leaked out to the outside of the radiation angle range Theta of the light-emitting element.
Description
Technical field
The present invention relates to a kind of turbidity transducer.
Background technology
Up to now, there will be a known a kind of turbidity transducer, it arranges the internal optics rectifier being intended to periodically carry out sensitivity test between light emitting diode and photodiode, the impact of light emitting diode Yin Wendu and the aging light quantity change caused are compensated (such as, referenced patent document 1).In this turbidity transducer, via the passage be arranged between light emitting diode and photodiode, the part penetrated from light emitting diode to the light in its irradiation angle range is guided to photodiode, according to the light quantity measured by photodiode, correction is carried out to the Turbidity measurement value of the light quantity influence of change being subject to light emitting diode.Be provided with the switching device shifter carrying out switching in the channels, close this passage when detecting turbidity, opening the light of Air conduct measurement for correction as required.
Prior art document
Patent documentation
Patent documentation 1: Jap.P. spy table 2006-510015 publication
Summary of the invention
The problem that invention will solve
But, in the turbidity transducer disclosed in patent documentation 1, because needs headspace between light emitting diode and photodiode arranges passage and switching device shifter, make it exist to be difficult to fully realize the shortcoming of miniaturization.In addition, owing to being provided with switching device shifter, also there is structure and the complicated problem of action (sequentially) in it.
Namely the present invention carries out in view of the above problems, its object is to provide one small-sized and the simple turbidity transducer of structure, even if because miniaturization causes the configuration space of light-emitting component and detection light receiving element to diminish, it still can compensate the light quantity change because of the change (temperature impact) of environment temperature and the aging light-emitting component caused of light-emitting component.
For the scheme of dealing with problems
For achieving the above object, the invention provides following proposal.
A scheme of the present invention is that provide a kind of turbidity transducer, it possesses: sensor main body, and it has light-proofness, and it possesses two blank parts, and these two blank parts possess opening, and this opening is reserved the adjacent configuration in compartment of terrain; Light-emitting component, it is configured in the described blank part of one of them, and it possesses semiconductor element, the opening direction of this semiconductor element described blank part of one of them towards this, in the irradiation angle range of regulation, penetrates light; Detection light receiving element, it is configured in wherein in blank part described in another, receives the light injected from the opening of blank part described in this another; And compensation optical pickup apparatus, it is configured in the described blank part of one of them at least partially, receives the light outside the described irradiation angle range leaking to described light-emitting component.
According to this programme, to expose in its irradiation angle range and the light of the scattering because of detected object is detected received with light receiving element from light-emitting component, meanwhile, detection light receiving element is independent of from the light-emitting component light exposed to outside its irradiation angle range and the compensation light receiving element arranged separately detected.Like this, without the need to as existing turbidity transducer for detecting for the light compensated the reserved space arranging blank part and switching device shifter between light-emitting component and detection light receiving element.Thus, the miniaturization of turbidity transducer can not only be realized, can also to light-emitting component because temperature influence and the aging light quantity change caused compensate, to carry out high-precision Turbidity measurement.
In such scheme, described light-emitting component also can be bullet cut LED, and this bullet cut LED is formed by the semiconductor element of injection light of casting with transparent resin.
Casting in the bullet cut LED of semiconductor element and light-emitting component by with transparent resin, at the light of its irradiation angle range internal radiation by the higher-strength of transparent resin optically focused, the light lower than the light intensity in irradiation angle range leaks to outside irradiation angle range from luminous point.The light quantity leaking to the light outside this irradiation angle range also changes along with the temperature impact of light-emitting component and aging degree.Utilize this characteristic, when the light quantity detected by compensation light receiving element is lower than the threshold value specified, by improving the mode such as voltage for light-emitting component, the light quantity being used for detecting scattered light is remained on certain limit, can to light-emitting component because temperature influence and the aging light quantity variation caused compensate.
In such scheme, described compensation optical pickup apparatus also can be light receiving element, and this light receiving element is configured in the rear in the injection direction of the light of described light-emitting component, and the planar tilt making light receiving surface vertical relative to the injection axle with light.
In this case, by making light receiving surface relative to the planar tilt vertical with injection axle, namely by configured angle of inclination, the light quantity detected by light receiving surface is regulated.Like this, by compensation light receiving element is adjusted to optimum angle, regulate detected light quantity, aperture of the prior art or shutter can be omitted, can not only structure be simplified, can also space be saved, realize the miniaturization of turbidity transducer.
In such scheme, described compensation optical pickup apparatus also can be light receiving element, and this light receiving element is configured in the direction intersected with the injection axle of described light-emitting component.
In such scheme, described compensation optical pickup apparatus also can be made up of optical fiber and light receiving element, one end of described optical fiber be configured in be configured with described light-emitting component blank part in the side of described light-emitting component, described light receiving element detects from the light that its other end penetrates by described optical fiber transmission.
In this case, the space configuring compensation light receiving element need not be remained in advance in blank part, simultaneously, the optical fiber of the thin bore do not taken up space is configured in the side of light-emitting component, and aperture and compensation light receiving element are configured at outside, therefore can realize the miniaturization more of turbidity transducer.
In such scheme, one end of described optical fiber also by tilted configuration, can be configured on the optical axis of optical fiber to avoid the luminous point of light-emitting component.
In this case, because the light quantity injected in optical fiber is different along with the angle of inclination difference of one end of configuration optical fiber, the light quantity injected in optical fiber can be reduced, even without the light modulating device of aperture one class, compensation optical pickup apparatus still can be made to have the light-receiving characteristic being equal to detection light receiving element.
The effect of invention
According to the present invention, one can be provided small-sized and the simple turbidity transducer of structure, even if because miniaturization causes the configuration space of light-emitting component and detection light receiving element to diminish, it still can compensate the light quantity change of the light-emitting component caused because of the change of environment temperature and the aging of light-emitting component.
Accompanying drawing explanation
Fig. 1 is the partly cut-away one-piece construction figure of the vertical section of the turbidity transducer that first embodiment of the present invention is shown.
Fig. 2 is the enlarged drawing of the light-emitting component of the turbidity transducer that Fig. 1 is shown.
Fig. 3 is the enlarged drawing of the details in the A portion of the turbidity transducer that Fig. 1 is shown.
Fig. 4 is the partly cut-away one-piece construction figure of the vertical section of the turbidity transducer that second embodiment of the present invention is shown.
Fig. 5 is the enlarged drawing of the details in the B portion of the turbidity transducer that Fig. 4 is shown.
Symbol description
1,15 turbidity transducers
2,3 blank parts
4 sensor main bodies
5 light-emitting components
6 detection light receiving elements
7 compensation light receiving elements
8,9 openings
10 semiconductor elements
11 light receiving surfaces
16 optical fiber
Embodiment
Referring to accompanying drawing, the turbidity transducer 1 of the 1st embodiment of the present invention is described.
As shown in Figure 1, the turbidity transducer 1 of present embodiment possesses: sensor main body 4, and it possesses two blank parts 2,3; Light-emitting component 5, it is configured in the blank part 2 of one of them of this sensor main body 4; Detect with light receiving element 6, it is configured in wherein in another blank part 3; And compensating with light receiving element 7, it is one of compensation optical pickup apparatus example, and it is configured in the blank part 2 of one of them at least partially.
Sensor main body 4 is made up of the material with light-proofness.Two blank parts 2,3 being configured at sensor main body 4 possess opening 8,9, and this opening 8,9 is reserved the adjacent end face 4a being configured at sensor main body 4 in compartment of terrain.
As shown in Figure 1, each blank part 2,3 tilts relative to an above-mentioned end face 4a, and the longitudinal axis of the blank part 2 of one of them is roughly at right angles to intersected with the longitudinal axis of wherein another blank part 3.
Light-emitting component 5 is such as light emitting diode (LED), and it is configured in this blank part 2 in the mode of the direction of the opening 8 towards the blank part 2 of one of them injection light.As shown in Figure 2, light-emitting component 5 is the semiconductor element 10 sending light by casting with epoxy resin 12 and form the bullet cut LED of bullet cut.Dome shape is formed as by making the head 5a of bullet cut, make the direction (hereinafter referred to as " front ") from semiconductor element 10 towards head 5a be issued to light in regulation irradiation angle range θ via head 5a optically focused, the light of high strength penetrates towards test liquid.
Semiconductor element 10 also spills light outside irradiation angle range θ.
Detection light receiving element 6 is such as photodiode, and it is configured in another blank part 3, to detect the light injected from the opening 9 of this another blank part 3.Detect with light detected by light receiving element 6, be the light of the injection from light-emitting component 5 towards test liquid because of the suspended matter composition test liquid a part for the scattered light of scattering.Because the light quantity of scattered light is less, even if detection light receiving element 6 preferably has the small element that still can carry out the light-receiving characteristic of Sensitive Detection of light quantity.
Compensation light receiving element 7 is also such as photodiode, as shown in Figure 3, it possesses flat light receiving surface 11, and this light receiving surface 11 detects the light quantity of the light that light-emitting component 5 spills towards square (hereinafter referred to as " rear ") in the opposite direction with head 5a.Take phenomenon etc. by mistake in order to avoid when Parts Purchasing or assembling, compensation light receiving element 7 preferably uses the element with the light-receiving characteristic being equal to detection light receiving element 6.
As shown in Figure 3, in blank part 2 one of wherein, this compensation light receiving element 7 is configured in the rear in the injection direction of the light that light-emitting component 5 irradiates, and light receiving surface 11 is tilted relative to the plane 5b of light-emitting component 5, and the plane 5b of this light-emitting component 5 is vertical with the injection axle L of light.Like this, the light for compensating can be detected, and the light of the injection from light-emitting component 5 towards test liquid can not be blocked.
What have light due to compensation light receiving element 7 injects the fewer characteristic of the angle light quantity larger, detected relative to the angle of inclination of the vertical line of light receiving surface 11, thus can tilt relative to injection axle L by making light-emitting component 5, reducing detected light quantity.
Like this, compensate the light quantity detected by light receiving surface 11 with light receiving element 7, light quantity detected when being be arranged in parallel with the plane 5b of light-emitting component 5 by light receiving surface 11 is less than.Therefore, even if compensation light receiving element 7 do not adopt the light modulating device of aperture and so on and direct-detection leak to light-emitting component 5 irradiation angle range θ outside light, also can control to detect light quantity, and the light-receiving characteristic being equal to detection light receiving element 6 can be had, this detection light receiving element 6 can detect that light quantity is than its faint scattered light of the auroral poles spilt from light-emitting component 5 sensitively.
In addition, each element 5,6,7, by not shown circuit, is connected with determination part (omit and illustrate) and power supply (omit and illustrate) etc., and this determination part calculates turbidity based on the light quantity received, display or output measured value.
With being reserved certain intervals (such as, more than 1.0mm) the adjacent configuration of each opening 8,9, is detected to avoid the light penetrated in irradiation angle range θ from light-emitting component 5 to inject opening 9 and detects as direct light with light receiving element 6.In order to realize miniaturization, preferred interval is less is advisable
For being filled with the resin filling portion 13,14 of epoxy resin 12 in blank part 2,3 between each element 5,6 and each opening 8,9.
Epoxy resin 12 is optical transparent resin, can be the light of 660 ~ 960nm through wavelength.By the mode filling epoxy resin 12 on the head 5a surface to be close to light-emitting component 5, light can be made to penetrate from opening 8 and not damage the directive property of light-emitting component 5.
Internal perisporium 2a, 3a of blank part 2,3 are at least colored as the black of extinction look on internal perisporium 13a, the 14a of part being filled with epoxy resin 12.Like this, the light penetrated from light-emitting component 5 and the scattered light injected from test liquid, once inject internal perisporium 13a, 14a of blank part 2,3, are not namely reflected by absorbing.
The effect of turbidity transducer 1 of the 1st embodiment with this kind of structure is illustrated.
Use turbidity transducer 1 pair of detected object of the 1st embodiment and the turbidity of test liquid to measure, need, under the state immersing in test liquid by sensor main body 4 end face 4a, to penetrate light from light-emitting component 5.
The light sent towards front from light-emitting component 5 penetrates to test liquid via epoxy resin 12 (resin filling portion 13) from opening 8, and this epoxy resin 12 is filled in the mode of landfill than the head 5a more space in front of light-emitting component 5.Penetrate and be scattered because of the suspended matter composition in test liquid to the light in test liquid, its some scattered light received with light receiving element 6 from opening 9 via the epoxy resin 12 (resin filling portion 14) in blank part 3 is detected.Like this, the turbidity in test liquid can be measured based on received light quantity.
In addition, leak to light below from the semiconductor element 10 of light-emitting component 5, the compensation light receiving element 7 being configured in the rear of light-emitting component 5 detected.Leak to the light outside its irradiation angle range θ from light-emitting component 5, with injection in irradiation angle range θ, the light that is used to detect scattered light is same, its light quantity along with the temperature of light-emitting component 5 affect and degree of aging change and change.Utilize this characteristic, when the light quantity detected by compensation light receiving element 7 is lower than the threshold value specified, by raising to modes such as the voltages of light-emitting component 5, the light quantity being used for detecting scattered light can be remained on certain limit, the variation of light-emitting component 5 because of temperature influence and the aging light quantity caused is compensated.
In the present embodiment, need not as the turbidity transducer of prior art, in order to detect that for the light compensated installation space is to configure blank part or switching device shifter between light emitting diode and photodiode.Thus, its advantage is, can not only realize the miniaturization of existing turbidity transducer, with simple structure, to light-emitting component 5 because temperature influence and the aging light quantity change caused are compensated, thus can also carry out high-precision Turbidity measurement.
In addition, in the present embodiment, as shown in Figure 3, by making the light receiving surface 11 of compensation light receiving element 7 tilt relative to the plane 5b vertical with injection axle L, namely the light quantity detected by light receiving surface 11 is regulated by configured angle of inclination.Like this, by compensation light receiving element 7 is adjusted to optimum angle, the light quantity detected by adjustment, can omit aperture of the prior art and shutter, can not only simplify structure, can also save space, realizes the miniaturization of turbidity transducer 1.
In addition, even if owing to not using aperture and shutter, also the element with detection light receiving element 6 with identical light-receiving characteristic can be used as compensation light receiving element 7, therefore, can not only reduce costs, can also prevent to take phenomenon by mistake when Parts Purchasing or assembling, wherein, described detection light receiving element 6 can detect the scattered light that light quantity is less sensitively.
Next, with reference to accompanying drawing, the turbidity transducer 15 of the 2nd embodiment of the present invention is described.
In description of the present embodiment, the part identical to the structure of the turbidity transducer 1 with above-mentioned 1st embodiment, mark identical symbol, the description thereof will be omitted.
As shown in Figure 4, the turbidity transducer 15 of present embodiment possesses: as optical fiber 16 and the compensation light receiving element 7 of one of compensation optical pickup apparatus example; In addition, between optical fiber 16 and compensation are with light receiving element 7, the aperture 17 light quantity of the light transmitted by optical fiber 16 being carried out regulating is possessed.Compensation light receiving element 7 is for detecting the light by aperture 17.
As shown in Figure 5, optical fiber 16 is inserted in hole, position that this hole is opened on the blank part 2 be arranged in sensor main body 4, that be configured with light-emitting component 5.One end 16a of optical fiber 16 is configured by the side towards the light-emitting component 5 in blank part 2, and its optical axis S is through the luminous point P of light-emitting component 5 inside.In addition, the other end 16b of optical fiber 16, configures to make its optical axis mode vertical with the light receiving surface 11 of compensation light receiving element 7 of the outside being configured at sensor main body 4.
The effect of turbidity transducer 15 of the present embodiment with this kind of structure is illustrated.
Turbidity transducer 15 according to the present embodiment, the light leaking to its side (outside irradiation angle range θ) from light-emitting component 5 is transmitted by optical fiber 16 and is received by compensation light receiving element 7.The light that leaks to rear of light also with illustrated the 1st embodiment leaking to its side from light-emitting component 5 is same, based on its light quantity, can be compensated because temperature impact and the aging light quantity caused change light-emitting component 5.
In addition, turbidity transducer 15 according to the present embodiment, its advantage is, not only in blank part 2, compensation light receiving element 7 need not be configured by headspace, the thin gauge fiber optic 16 do not taken up room can also be configured in the side of light-emitting component 5, further, due to aperture 17 and compensation light receiving element 7 are configured in outside, the miniaturization of turbidity transducer 15 can therefore be realized further.
And, in the above-described embodiment, injection is detected to the rear of light-emitting component 5 or the light of side as the light being used for compensating, but be not limited thereto, as long as the light outside irradiation angle range θ, even the light that the either direction of intersecting towards the injection axle L with light-emitting component 5 penetrates, the light that all can be used as compensating is used, and can not block the light (light in the irradiation angle range θ of the injection from light-emitting component 5 towards test liquid) for detecting scattered light.
In addition, in above-mentioned 2nd embodiment, also one end 16a of tiltable configuration optical fiber 16, is configured on the optical axis of optical fiber 16 to avoid the luminous point P of light-emitting component 5.
Thus, the light quantity injected in optical fiber 16 can be reduced, even without the light modulating device of aperture 17 and so on, compensation light receiving element 7 still can be made to have the light-receiving characteristic being equal to detection light receiving element 6.
In addition, in above-mentioned 2nd embodiment, compensation light receiving element 7 is configured at the outside of sensor main body 4, is not limited thereto, have enough spaces if can guarantee, also can be configured at the inside of sensor main body 4.Like this, turbidity transducer 15 miniaturization on the whole can be realized.
Claims (6)
1. a turbidity transducer, it possesses:
Sensor main body, it has light-proofness, and possesses two blank parts, and these two blank parts possess opening, and this opening is reserved the adjacent configuration in compartment of terrain;
Light-emitting component, it is configured in the described blank part of one of them, and it possesses semiconductor element, this semiconductor element towards described blank part opening direction, regulation irradiation angle range in penetrate light;
Detection light receiving element, it is configured in wherein in blank part described in another, receives the light injected from the opening of blank part described in this another; And
Compensation optical pickup apparatus, it is configured in the described blank part of one of them at least partially, receives the light outside the described irradiation angle range leaking to described light-emitting component.
2. turbidity transducer according to claim 1, wherein, described light-emitting component is bullet cut LED, and this bullet cut LED is formed by the semiconductor element of injection light of casting with transparent resin.
3. turbidity transducer according to claim 1 and 2, wherein, described compensation optical pickup apparatus is light receiving element, and this light receiving element is configured in the rear in the injection direction of the light of described light-emitting component, and the planar tilt making light receiving surface vertical relative to the injection axle with light.
4. turbidity transducer according to claim 1 and 2, wherein, described compensation optical pickup apparatus is light receiving element, and this light receiving element is configured in the direction intersected with the injection axle of described light-emitting component.
5. according to the turbidity transducer in claim 1,2 and 4 described in any one, wherein, described compensation optical pickup apparatus is made up of optical fiber and light receiving element, one end of described optical fiber be configured in be configured with described light-emitting component blank part in the side of described light-emitting component, described light receiving element detects from the light that its other end penetrates by described optical fiber transmission.
6. turbidity transducer according to claim 5, wherein, one end of described optical fiber, by tilted configuration, is configured on the optical axis of optical fiber to avoid the luminous point of light-emitting component.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013-116195 | 2013-05-31 | ||
| JP2013116195A JP2014235061A (en) | 2013-05-31 | 2013-05-31 | Turbidity sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104215609A true CN104215609A (en) | 2014-12-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410222367.8A Pending CN104215609A (en) | 2013-05-31 | 2014-05-23 | Turbidity sensor |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2014235061A (en) |
| CN (1) | CN104215609A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111065914A (en) * | 2017-09-01 | 2020-04-24 | 优志旺电机株式会社 | Enzyme-linked immunosorbent assay (ELISA) instrument |
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| JPS60216245A (en) * | 1984-04-11 | 1985-10-29 | Tokai Rika Co Ltd | Water drip sensor |
| AT382719B (en) * | 1985-07-08 | 1987-04-10 | Carl M Dr Fleck | AMPLITUDE OR INTENSITY MODULATED FIBER OPTICAL SOUND SENSOR |
| JPS6258746U (en) * | 1985-10-01 | 1987-04-11 | ||
| JPH071273B2 (en) * | 1986-04-25 | 1995-01-11 | 節雄 高谷 | Method for measuring oxygen saturation of hemoglobin and reflected light sensor used therefor |
| US5436718A (en) * | 1993-07-30 | 1995-07-25 | Biolumin Corporation | Mutli-functional photometer with movable linkage for routing optical fibers |
| JP3334829B2 (en) * | 1995-03-08 | 2002-10-15 | 日本電信電話株式会社 | Optical semiconductor module |
| US5589935A (en) * | 1995-05-25 | 1996-12-31 | Honeywell, Inc. | Turbidity sensor with the capability of regulating the intensity of a light source |
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| CN111065914A (en) * | 2017-09-01 | 2020-04-24 | 优志旺电机株式会社 | Enzyme-linked immunosorbent assay (ELISA) instrument |
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Application publication date: 20141217 |