GB2398382A - Oil mist sensing device - Google Patents
Oil mist sensing device Download PDFInfo
- Publication number
- GB2398382A GB2398382A GB0400491A GB0400491A GB2398382A GB 2398382 A GB2398382 A GB 2398382A GB 0400491 A GB0400491 A GB 0400491A GB 0400491 A GB0400491 A GB 0400491A GB 2398382 A GB2398382 A GB 2398382A
- Authority
- GB
- United Kingdom
- Prior art keywords
- light
- inflect
- oil mist
- radiated
- sensing area
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000003595 mist Substances 0.000 title claims abstract description 74
- 230000003287 optical effect Effects 0.000 claims abstract description 37
- 238000000034 method Methods 0.000 claims description 5
- 239000011800 void material Substances 0.000 claims description 5
- 230000001678 irradiating effect Effects 0.000 claims description 2
- 238000011109 contamination Methods 0.000 description 16
- 238000000149 argon plasma sintering Methods 0.000 description 9
- 230000005540 biological transmission Effects 0.000 description 8
- 238000010521 absorption reaction Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000007257 malfunction Effects 0.000 description 3
- 230000002238 attenuated effect Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/47—Scattering, i.e. diffuse reflection
- G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
- G01N21/53—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke
Abstract
An oil mist sensing device 1 is disclosed comprising, a light emitting means 2 that generates radiated light LB, a photo receiving means 3 that outputs a signal corresponding to the intensity of the received light, a first inflect means 41 that refracts the radiated light LB and introduces the refracted radiated light into a predetermined sensing area S, a second inflect means 42 that refracts the reflected/scattered light LS that is generated from the radiated light LB irradiated on oil mist existing in the sensing area S, and a light shielding member 51 arranged to lie between the first and second inflect means 41,42. An optical axis of the radiated light LB or the reflected/scattered light LS is inflected by at least either one of the first and second inflect means 41,42 such that the optical axis of the radiated light LB radiated from the light emitting means 2 is generally parallel to the optical axis of the reflected/scattered light LS introduced in the photo receiving means 3.
Description
Oil Mist Sensing Device The present invention relates to an oil mist
sensing device of a light scattering type that senses oil mist generated by heat around the time when lubricant is burned.
There are mainly two types of conventional device to optically measure a concentration or an amount of oil mist, namely a light transmission and absorption type and a light scattering type.
The light transmission and absorption type is, as shown in Fig. 4, so arranged that a light emitting element faces a photo acceptance element while keeping at an appropriate distance and senses whether or not there exists oil mist between the light emitting element and the photo acceptance element by means of attenuation of transmitted light due to light absorption. Consequently, the light transmission and absorption type is greatly influenced by contamination of a light transmission window and might introduce malfunction because of light attenuation due to contamination. For example, as shown in Fig. 5, in a normal state if it is assumed that 20 percent of the maximum amount of received light that the photo acceptance element receives from the light emitting element is an amount attenuated by the oil mist generating at the maximum and 10 percent of the amount of the received light attenuates due to contamination, a judging means such as a computer mistakenly judges that 50 percent of the maximum generating amount of the oil mist is generated. As mentioned above, the light transmission and absorption type has an inclination to malfunction even if contamination is subtle, and may make false recognition and erroneous reports in spite of no oil mist being generated. Consequently this device requires a periodic calibration with fresh air or maintenance such as cleaning.
The light scattering type, as shown in Fig. 6, uses a method of sensing lateral scattering in a Mie scattering area by means of a particle 1 1 size of oil mist. With this method, in case of no oil mist existing, since light radiated from a light emitting element does not enter a photo acceptance element in principle, there is a merit that is insusceptible against contamination of a window in sensing the oil mist although sensitivity might change to a degree. More specifically, if a photo acceptance amount is attenuated by 5 percent due to contamination, the light scattering type just senses that a generating amount of the oil mist drops by 5 percent and the sensed amount is not drastically different from an accurate amount compared with the above-mentioned light transmission absorption type. As mentioned above, the light scattering type produces the above-mentioned effect as long as an oil mist generating space is big and the scattered light against a wall in the space can be negligible.
However, in the case where a space into which oil mist is introduced is, for example, small, since the light scattering type has such an arrangement that the light emitting element and the photo acceptance element are arranged at right angles, a lot of base light (stray light) enters the photo acceptance element due to the scattered light scattered against the wall in the space in spite of no oil mist existing and an output level due to the base light fluctuates under the influence of contamination, resulting in malfunction. For example, as shown in Fig. 7, when contamination occurs, the output level (zero point) due to the base light drops as a result of contamination. Then it happens that a sum of the output level (zero point value) and the output value does not reach a warning level, even though the output value goes up as a result of the scattered light due to the oil mist, thereby failing to report an occurrence of oil mist. As a result of this, some of this type are calibrated by means of a complicated structure as shown in Japanese Patent No. 3263085.
Further, in either type of the above, the light emitting element and the photo acceptance element are required to be arranged separately at a certain distance. If both of them are to be accommodated into a casing, the casing will become large. If both of them are to be mounted separately, a procedure to mount the light emitting element and the photo acceptance element on an engine or the like will become complicated and an accuracy of positioning to mount the light emitting element and the photo acceptance element might be degraded.
The present claimed invention mainly intends to provide an oil mist sensing device that can be downsized by making use of characteristics of the light scattering type that is stain-resistant against oil mist.
The oil mist sensing device in accordance with the present claimed invention comprises a light emitting means that emits radiated light, a photo acceptance means that outputs a signal of a value according to an intensity of received light, a first inflect means that inflects the radiated light and introduces it into a predetermined sensing area and a second inflect means that inflects reflected/scattered light that is generated from the radiated light irradiated on oil mist existing in the sensing area and introduces it into the photo acceptance means, wherein an optical axis of the radiated light or the reflected/scattered light is inflected by at least either one of the first and the second inflect means so as to make the optical axis of the radiated light radiated from the light emitting means generally parallel to the optical axis of the reflected/scattered light introduced into the photo acceptance means, and a light shielding member is arranged to lie between the first inflect means and the second inflect means.
In accordance with this arrangement, since the optical axis of the radiated light radiated from the light emitting means is set to be generally parallel to the optical axis of the reflected/scattered light introduced into the photo acceptance means, a structure including an optical system can l be downsized such that the light emitting means can be arranged in proximity to the photo acceptance means. In addition, since all of the light emitting means, the photo acceptance means and the first and the second inflect means can be accommodated into a single compact casing, it is possible to mount the oil mist sensing device with ease on a wall of a crankcase of a diesel engine by making use of, for example, only one hole and there will be no defect deriving from alignment of the light emitting means and the photo acceptance means.
In the case where the first and the second inflect means are arranged in proximity as a result of downsizing, the radiated light entering the first inflect means is introduced into the second inflect means due to internal reflection as a result of contamination and a level of base light might fluctuate due to the light introduced into the second inflect means.
However, since the light shielding member is provided in the present claimed invention, the radiated light entering the first inflect means is rarely introduced into the second inflect means and the level of the base light rarely fluctuates.
In one embodiment to promote downsizing by integrating each of the inflect means and the light shielding member or to increase an amount of light that can be utilized by the light emitting means and the photo acceptance means, it is preferable that the first and the second inflect means are in a shape of a lens generally halved by a straight line passing an optical axis of the lens and the light shielding member is in a shape of a thin-walled plate arranged so as to interpose between halved faces of the lens. The light shielding member and each of the inflect means may be manufactured separately and then united or may be integrally formed.
In a prefered embodiment to mount the oil mist sensing device on a crankcase of an engine or the like, it is desirable that it comprises a casing whose shape is generally cylindrical, wherein the light emitting 1 1 means, the photo acceptance means, the first inflect means and the second inflect means are accommodated in the casing. If a screw head is arranged on a periphery of the casing, the oil mist sensing device can be mounted on the crankcase of the engine easily just by thirling on (i.e. making a hole in)the crankcase.
In the case where the space into which oil mist is introduced is relatively small, the radiated light is scattered against an inner wall of the space and the scattered light is base light at a level which is not negligible, it is preferable that a second light shielding member that shields light is arranged in an anti-side of the inflect means to the sensing area and between an extension of the optical axis of the radiated light traveling from the first inflect means toward the sensing area and an extension of the optical axis of the reflected/scattered light traveling from the sensing area toward the second inflect means. In accordance with the arrangement the level of the base light can be lowered by the second light shielding member and an accuracy of sensing the oil mist can be improved even if contamination occurs because a fluctuation of the output value becomes small.
In order to further lower the level of the base light and to further lower an output shift resulting from contamination, it is preferable that each space divided by the second light shielding member serves as a blackbody void.
In another embodiment to lower the level of the base light, it is preferable that a third light shielding member is arranged to face the inflect means at a portion corresponding to the sensing area and a space other than the sensing area is divided into back and forth by the third light shielding member.
The invention will now be described in more detail by way of examples with reference to the accompanying drawings in which: Fig. 1 is a longitudinal end view showing an internal arrangement of an oil mist sensing device in accordance with a first embodiment of the present claimed invention.
Fig. 2 is a front view showing a lens unit in accordance with the embodiment.
Fig. 3 is longitudinal end view showing an internal arrangement of an oil mist sensing device in accordance with a second embodiment of the present claimed invention.
Fig. 4 is a principle explanatory diagram to explain sensing principle of a conventional oil mist sensing device of a light transmission and absorption type.
Fig. 5 is an explanatory diagram to explain a problem of the conventional oil mist sensing device of the light transmission and absorption type.
Fig. 6 is a principle explanatory diagram to explain sensing principle of a conventional oil mist sensing device of a light scattering type.
Fig. 7 is an explanatory diagram to explain a problem of the conventional oil mist sensing device of the light scattering type.
With reference to Figs 1 and 2, an oil mist sensing device 1 in accordance with the first embodiment is arranged to sense concentration of oil mist by a process of irradiating radiated light LB on a predetermined sensing area S and measuring intensity of reflected/scattered light LS generating from the radiated light irradiated on the oil mist existing in the 2 5 sensing area S and applies to a relatively big space where oil mist generates such as a large size diesel engine or the like.
More specifically, the oil mist sensing device 1 comprises, as shown in Fig. 1, a light emitting means 2 that ingenerates (or creates or generates) the radiated light LB, a photo acceptance means 3 that receives the reflected/scattered light LS, a first inflect (or refracting or bending) means 41 that lies between the light emitting means 2 and the sensing area S. a second inflect (or refracting or bending) means 42 that lies between the photo acceptance means 3 and the sensing area S. a light shielding member 51 that is arranged between the first inflect means 41 and the second inflect means 42 and a casing 6 that accommodates each of components 2, 3, 41, 42, 51.
Each component will be described in detail.
The light emitting means 2 is, for example, an LED and ingenerates light whose waveband range is limited to a certain level when an electric power is supplied. In this embodiment the light emitting means 2 used ingenerates the light whose waveband range conforms to a diameter of an oil mist particle based on the Mie scattering theory. It is a matter of course that the light emitting means 2 such as an LD or the like may be used.
The photo acceptance means 3 is, for example, a photodiode in this embodiment and outputs an electrical signal whose value corresponds to the intensity of the light received on its photo acceptance surface. It is a matter of course that the photo acceptance means 3 such as a COD or the like may be used.
Each of the first inflect means 41 and the second inflect means 42 is, as shown in Fig. 2, in a shape of a semicircle wherein a circular convex lens is halved by a straight line passing an optical axis (a center) of the convex lens. The light shielding member 51 in a shape of a thin walled plate is arranged to interpose between halved faces of the convex lens so that a lens unit RU whose outline is in a shape of a circle is formed with the first inflect means 41, the second inflect means 42 and the light shielding member 51 integrated.
The casing 6 is in a generally cylindrical shape whose distal end face is open and comprises a surrounding wall 61 on an outer circumferential face of which is arranged a screw thread, a supporting plate 62 arranged orthogonal to a casing main axis 6L inside the surrounding wall 61 near a proximal end of the surrounding wall 61, a window plate 63 arranged orthogonal to the casing main axis 6L inside the surrounding wall 61 near a distal end of the surrounding wall 61 and an inside partition wall 64 that is arranged between the supporting plate 62 and the window wall 63 and that divides a space therebetween into two. The supporting plate 62 supports the light emitting means 2 and the photo acceptance means 3 so that each of a light emitting surface of the light emitting means 2 and the photo acceptance surface of the photo acceptance means 3 is vertical to the casing main axis 6L and symmetrical to each other with centering on the casing main axis 6L. A through hole 63a to pass light is arranged on the window plate 63 at a position corresponding to each of the light emitting surface and the photo acceptance surface. The inside partition wall 64 divides the space surrounded by the surrounding wall 61, the supporting plate 62 and the window plate 63 into two symmetrical spaces each of which accommodates the light emitting means 2 and the photo acceptance means 3 respectively and bridges the light emitting means 2 and the photo acceptance means 3 along the casing main axis 6L.
A bore diameter of the surrounding wall 61 is set slightly bigger than an external diameter of the lens unit RU and the lens unit RU is fixed to a distal end portion of the surrounding wall 61 and an outer side of the window plate 63 in an inlayed state.
Further in this embodiment, a control portion, not shown in drawings, is arranged to supply the light emitting means 2 with electric power, to amplify an output of the photo acceptance means 3 or to control a luminous cycle and a photo acceptance cycle synchronously.
The control portion is accommodated in a control portion casing 6A arranged at a proximal end of the casing 6.
The oil mist sensing device 1 is mounted on a predetermined portion such as a crankcase(not shown)of an engine by making use of the screw thread arranged on the outer circumferential face of the surrounding wall 61.
Next an operation of the oil mist sensing device 1 will be explained.
The radiated light LB radiated from the light emitting means 2 travels generally parallel to the casing main axis 6L whilst extending a little. After the radiated light LB passes the through hole 63a, the optical axis of the radiated light LB is inflected and generally paralleled by the first inflect means 41 and the inflected radiated light LB is irradiated on the sensing area S set near a focal point of the first inflect means 41.
The radiated light LB that reaches the second inflect means 42 out of the reflected/scattered light LS that reflects or scatters against the oil mist in the sensing area S is inflected so that an optical axis LSC of the reflected/scattered light LS is generally parallel to the casing main axis 6L and the reflected/scattered light LS is concentrated on the photo acceptance surface of the photo acceptance means 3. In this embodiment an angle of an optical axis LBC of the incident radiated light LB in the sensing area S with the optical axis LSC of the reflected/scattered light LS that scoffers in the sensing area S and travels toward the second inflect means 42 is set to be smaller than 90 degrees.
The photo acceptance means 3 outputs an electronic signal of a value in accordance with an intensity of the accepted reflected/scattered light LS. The electronic signal is amplified by the control portion and concentration of the oil mist existing in the sensing area S is determined based on the amplified electronic signal.
In accordance with this embodiment, since the optical axis of the radiated light LB radiated from the light emitting means 2 is set to be generally parallel to the optical axis of the reflected/scattered light LS introduced into the photo acceptance means 3, a structure including an optical system can be downsized such that the light emitting means 2 can be arranged in proximity to the photo acceptance means 3. In addition, since the casing 6 is made in a cylindrical shape and the light emitting means 2, the photo acceptance means 3 and the first and the second inflect means 41 and 42 are accommodated into the casing 6, it is possible to mount the oil mist sensing device 1 with ease on a wall of a crankcase of a diesel engine by making use of, for example, only one hole and there will be no defect deriving from alignment of the light emitting means 2 and the photo acceptance means 3.
Further, since the light is blocked by the light shielding member 51 although internal reflection is generated due to contamination of a surface of the first or the second inflect means 41, 42 by oil mist, the radiated light LB entering the first inflect means 41 is hardly introduced into the second inflect means 42 because of the internal reflection and there will be no fluctuation in a level of base light due to the internal reflection. It is a matter of course that even in the case where there is no contamination, the base light that might be introduced into the second inflect means 42 due to reflection against a surface of the lens can be prevented by the light shielding member 51.
In addition, since each of the first and the second inflect means 41, 42 is a lens in semicircle and fittingly inserted into the cylindrical casing 6, it is possible to increase a utilizable amount of light and to obtain a big sensitivity with a compact structure in comparison with the case where each of the inflect means is a circular lens and independently arranged.
In this embodiment, since an oil mist generating space is big, stray light generating from the radiated light LB passing the sensing area S and reflecting or scattering against an inner wall of the oil mist generating space is at a negligible level, the fluctuation of the level of the base light due to the stray light and an error in detection of concentration of the oil mist resulting from the fluctuation can also be negligible.
The oil mist sensing device 1 in accordance with the second embodiment shown in Fig.3 is applied to a relatively small oil mist generating space such as a small size diesel engine and effective for a case wherein a level of the base light that is generated after the radiated light LB passing the sensing area S reflects or scatters against the inner wall in the oil mist generating space is not negligible. The same references will be given to components in the second embodiment corresponding to the same components in the first embodiment.
The oil mist sensing device 1 in this embodiment further comprises a second casing 6B that is arranged at the distal end of the casing 6 in addition to the arrangement of the first embodiment.
The second casing 6B is in a generally cylindrical shape whose diameter is generally the same as that of the casing 6 and whose distal end face is sealed and comprises an oil mist introducing port (not shown)that introduces oil mist into the device and an oil mist discharging port (not shown)that discharges the oil mist out of the device. The oil mist introducing port and the oil mist discharging port are arranged, for example, near the sensing area S formed in the second casing 6B.
A second light shielding member 52 that shields light is arranged ahead of the sensing area S inside the second casing 6B, namely, in an anti- side of the inflect means 41, 42 to the sensing area S (i.e. on the other side of the sensing area remote from the inflect means) and between an extension of the optical axis of the radiated light LB traveling from the first inflect means 41 toward the sensing area S and an extension of the optical axis of the reflected/scattered light LS traveling from the sensing area S toward the second inflect means 42. The second light shielding member 52 is in a shape of a plate and arranged to bridge a front portion of the sensing area S and a distal end inner face of the second casing 6B and divides a distal end side of the second casing 6B longitudinally along the main axis 6L so as to form two spaces 6a, fib.
Further, the distal end inner face of the second casing 6B is formed to be tapered wherein its cross-sectional area is gradually diminished toward a distal end thereof and each of the spaces 6a, 6b is so arranged to serve as a blackbody void that internally reflects the light introduced inside the spaces 6a, 6b a plurality of times and absorbs it.
Further, a third light shielding member 53 is arranged orthogonal to the casing main axis 6L inside the second casing 6B at a portion corresponding to the sensing area S. The third light shielding member 53 has, for example, an elliptical slit 53a at a center thereof and the sensing area S is formed back and forth of the slit 53a extending through the slit 53a. The slit 53a is formed so as to avoid generating scattered light due to direct contact of the radiated light LB with the light shielding member 53.
In accordance with this arrangement, the light can be shielded by the second casing 6B even though the oil mist generating space is relatively small such as a small diesel engine. As a result, reflected or scattered light generating as a result of the radiated light LB reflecting against an inner wall of the oil mist generating space does not generate and an effect influenced by other stray light can be negligible. Further, since the light radiated from the light emitting means 2 and the light entering the photo acceptance means 3 are shielded by the second light shielding member 52 in the second casing 6B and each of the spaces 6a, 6b forms an independent blackbody void respectively, most of the shielded light is absorbed through the influence of the blackbody void effect. In addition, diffused light due to lens aberration or scattering of the first and the second inflect members 41, 42 can be cut by the third light shielding member 53.
In accordance with the arrangement, since a level of the scattered light in the background can be negligible and an output shift due to the base light can be restrained, a complicated calibration is not required even though contamination occurs, thereby making the oil mist sensing device highly dependable, compact and low-priced.
The present claimed invention is not limited to the above embodiments.
Each of the inflect means may be an independent lens. The optical axis of the radiated light and the optical axis of the reflected/scattered light are not necessarily inflected symmetrically by each of the inflect means respectively, and only either one of the optical axes may be inflected or the optical axes may be inflected asymmetrically. In brief, the optical axis of the radiated light radiated from the light emitting means and the optical axis of the reflected/scattered light introduced into the photo acceptance means may be generally parallel to each other to a degree that downsizing can be promoted.
The present claimed invention is not limited to the above- described embodiment, and there may be various modifications without departing from the scope of the invention as defined in the appended claims.
As mentioned above, in accordance with the present claimed invention, since the optical axis of the radiated light radiated from the light emitting means is set to be generally parallel to the optical axis of the reflected/scattered light introduced into the photo acceptance means, a structure including an optical system can be downsized such that the light emitting means can be arranged in proximity to the photo acceptance means. In addition, since all components can be accommodated in the single compact casing, it is possible to mount the oil mist sensing device with ease on a wall of a crankcase of a diesel engine by making use of, for example, only one hole and there will be no defect deriving from alignment of the light emitting means and the photo acceptance means.
Further, in the case where the inflect means are arranged in proximity due to downsizing, the radiated light entering the first inflect means might be introduced into the second inflect means due to internal reflection such as contamination and the level of the base light might fluctuate due to the light. However, in accordance with the present claimed invention, since the light shielding member is provided, the radiated light entering the first inflect means is hardly introduced into the second inflect means and there will be no fluctuation in the level of the base light due to the internal reflection.
Claims (8)
1. An oil mist sensing device that senses oil mist by a process of irradiating radiated light radiated from a light emitting means on a predetermined sensing area and receiving reflected/scattered light that is generated from the radiated light irradiated on oil mist existing in the sensing area with a photo acceptance means, said device comprising a first inflect means that lies between the light emitting means and the sensing area and a second inflect means that lies between the photo acceptance means and the sensing area, wherein an optical axis of the radiated light or the reflected/scattered light is inflected by at least either one of the first and the second inflect means so as to make the optical axis of the radiated light radiated from the light emitting means generally parallel to the optical axis of the reflected/scattered light introduced into the photo acceptance means, and a light shielding member is arranged to lie between the first inflect means and the second inflect means.
2. The oil mist sensing device as claimed in claim 1, wherein the first and the second inflect means are in a shape of a lens generally halved by a straight line passing an optical axis of the lens and the light shielding member is in a shape of a thin-walled plate arranged so as to interpose between halved faces of the lens.
3. The oil mist sensing device as claimed in claim 1 or 2, further comprising a cylindrical casing, wherein the light emitting means, the photo acceptance means, the first inflect means and the second inflect means are accommodated in the casing.
4. The oil mist sensing device as claimed in claim 3, wherein a screw head is arranged on a periphery of the casing.
5. The oil mist sensing device as claimed in any preceding claim, wherein a second light shielding member that shields light is arranged in an antiside of the inflect means to the sensing area and between an extension of the optical axis of the radiated light traveling from the first inflect means toward the sensing area and an extension of the optical axis of the reflected/scattered light traveling from the sensing area toward the second inflect means.
6. The oil mist sensing device as claimed in claim 5, wherein each space divided by the second light shielding member serves as a blackbody void.
7. The oil mist sensing device as claimed in any preceding claim, wherein a third light shielding member is arranged to face the inflect means at a portion corresponding to the sensing area and a space other than the sensing area is divided into back and forth by the third light shielding member.
8. An oil mist sensing device substantially as herein described with reference to Figs 1 and 2 or Fig.3 of the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003004034A JP3957639B2 (en) | 2003-01-10 | 2003-01-10 | Oil mist detection device |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB0400491D0 GB0400491D0 (en) | 2004-02-11 |
| GB2398382A true GB2398382A (en) | 2004-08-18 |
| GB2398382B GB2398382B (en) | 2006-02-01 |
Family
ID=31712385
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0400491A Expired - Lifetime GB2398382B (en) | 2003-01-10 | 2004-01-09 | Oil mist sensing device |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP3957639B2 (en) |
| DE (1) | DE102004001357B4 (en) |
| GB (1) | GB2398382B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1936358A1 (en) | 2006-12-21 | 2008-06-25 | Horiba, Ltd. | Oil mist detector |
| CN102297023A (en) * | 2011-07-14 | 2011-12-28 | 北京伟林科信科技有限公司 | Open type cavity structure for preventing oil drops from splashing to affect oil mist sensor |
| EP2645077A1 (en) | 2012-03-27 | 2013-10-02 | Siemens Aktiengesellschaft | Sample collecting device for droplet and gas sampling in narrow ducts of a gas turbine or any other device with an oil breather |
| EP2645100A1 (en) | 2012-03-27 | 2013-10-02 | Siemens Aktiengesellschaft | Infrared spectrometer measurement of droplets collected from an oil mist in a breather pipe of a gas turbine |
| EP3086109A1 (en) * | 2015-04-22 | 2016-10-26 | HORIBA, Ltd. | Oil mist detecting device and oil mist detecting method |
| DE102017107963A1 (en) * | 2017-04-12 | 2018-06-14 | Exner & Tottewitz Besitz GbR (vertretungsberechtigte Gesellschafter: Detlef Exner, 71297 Mönsheim; Michael Tottewitz, 76689 Karlsdorf-Neuthard) | Backscatter sensor for liquid, pasty and / or powdery media and method for measuring optical backscatter in liquid, pasty and / or powdery media |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101045322B1 (en) * | 2011-03-08 | 2011-06-29 | (주)광산 | Oil mist detector having transparent window contamination detection part and transparent window contamination detection method of oil mist detector |
| JP6317218B2 (en) * | 2014-09-16 | 2018-04-25 | 能美防災株式会社 | Dimmable smoke detector |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0036370A1 (en) * | 1980-03-18 | 1981-09-23 | Enertec Societe Anonyme | Method and device for evaluating visibility |
| GB2166232A (en) * | 1984-10-10 | 1986-04-30 | Lee Dickens Limited | Monitoring oil mist level |
| JPH1047591A (en) * | 1996-05-08 | 1998-02-20 | Tadao Totsuka | Oil mist sensor |
| EP1063512A2 (en) * | 1999-05-04 | 2000-12-27 | Laser Sensor Technology, Inc. | Method and apparatus for particle assessment using multiple scanning beam reflectance |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2309076B (en) * | 1996-01-10 | 1999-08-11 | Kidde Fire Protection Ltd | Particle separation and detection apparatus |
| DE10204906A1 (en) * | 2001-04-20 | 2002-10-24 | Telegaertner Geraetebau Gmbh | Optical sensor arrangement for aerosol detection, especially for determining the oil particle concentration in gaseous media in explosive areas, has measurement electronics linked to the optical measurement head by optical fiber |
| JP3840470B2 (en) * | 2003-12-03 | 2006-11-01 | 株式会社堀場製作所 | Oil mist detection device |
-
2003
- 2003-01-10 JP JP2003004034A patent/JP3957639B2/en not_active Expired - Lifetime
-
2004
- 2004-01-08 DE DE200410001357 patent/DE102004001357B4/en not_active Expired - Lifetime
- 2004-01-09 GB GB0400491A patent/GB2398382B/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0036370A1 (en) * | 1980-03-18 | 1981-09-23 | Enertec Societe Anonyme | Method and device for evaluating visibility |
| GB2166232A (en) * | 1984-10-10 | 1986-04-30 | Lee Dickens Limited | Monitoring oil mist level |
| JPH1047591A (en) * | 1996-05-08 | 1998-02-20 | Tadao Totsuka | Oil mist sensor |
| EP1063512A2 (en) * | 1999-05-04 | 2000-12-27 | Laser Sensor Technology, Inc. | Method and apparatus for particle assessment using multiple scanning beam reflectance |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1936358A1 (en) | 2006-12-21 | 2008-06-25 | Horiba, Ltd. | Oil mist detector |
| CN101206176B (en) * | 2006-12-21 | 2012-12-12 | 株式会社堀场制作所 | Oil mist detector |
| CN102297023A (en) * | 2011-07-14 | 2011-12-28 | 北京伟林科信科技有限公司 | Open type cavity structure for preventing oil drops from splashing to affect oil mist sensor |
| EP2645077A1 (en) | 2012-03-27 | 2013-10-02 | Siemens Aktiengesellschaft | Sample collecting device for droplet and gas sampling in narrow ducts of a gas turbine or any other device with an oil breather |
| EP2645100A1 (en) | 2012-03-27 | 2013-10-02 | Siemens Aktiengesellschaft | Infrared spectrometer measurement of droplets collected from an oil mist in a breather pipe of a gas turbine |
| WO2013143835A1 (en) | 2012-03-27 | 2013-10-03 | Siemens Aktiengesellschaft | Infrared spectrometer measurement of droplets collected from an oil mist in a breather pipe of a gas turbine |
| WO2013143756A1 (en) | 2012-03-27 | 2013-10-03 | Siemens Aktiengesellschaft | Sample collecting device for droplet and gas sampling in narrow ducts of a gas turbine or any other device with an oil breather |
| US9863873B2 (en) | 2012-03-27 | 2018-01-09 | Siemens Aktiengesellschaft | Infrared spectrometer measurement of droplets collected from an oil mist in a breather pipe of a gas turbine |
| EP3086109A1 (en) * | 2015-04-22 | 2016-10-26 | HORIBA, Ltd. | Oil mist detecting device and oil mist detecting method |
| DE102017107963A1 (en) * | 2017-04-12 | 2018-06-14 | Exner & Tottewitz Besitz GbR (vertretungsberechtigte Gesellschafter: Detlef Exner, 71297 Mönsheim; Michael Tottewitz, 76689 Karlsdorf-Neuthard) | Backscatter sensor for liquid, pasty and / or powdery media and method for measuring optical backscatter in liquid, pasty and / or powdery media |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102004001357B4 (en) | 2013-01-31 |
| DE102004001357A1 (en) | 2004-08-12 |
| GB2398382B (en) | 2006-02-01 |
| JP2004219131A (en) | 2004-08-05 |
| GB0400491D0 (en) | 2004-02-11 |
| JP3957639B2 (en) | 2007-08-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101319801B1 (en) | Oil mist detector | |
| US6519034B1 (en) | Oil quality sensor | |
| US20140326889A1 (en) | Detector | |
| JP2899651B2 (en) | Light transmission type spectrometer | |
| GB2408798A (en) | Light-scattering oil mist detecting device with means for preventing oil droplets entering the casing | |
| US5568130A (en) | Fire detector | |
| GB2398382A (en) | Oil mist sensing device | |
| JP2009515159A (en) | Laser radiation source | |
| JP2007198883A (en) | Spectral measuring instrument by optical fiber probe | |
| CN108572152B (en) | Optical sensor with lining layer sensor | |
| US3932763A (en) | Detector for tubular transparent article | |
| JPH09269293A (en) | Particulate detector | |
| US20220412866A1 (en) | Optical particle counter for air quality assessment | |
| JPH0933434A (en) | Photoelectric dust sensor | |
| KR20200103482A (en) | Multi gas sensing apparatus | |
| WO2023013314A1 (en) | Density measurement device | |
| KR102645857B1 (en) | Laser scanner | |
| CN116660149A (en) | Sensor for detecting a position of a body | |
| TWI792666B (en) | Measuring urine sugar concentration device | |
| JP2006292548A (en) | Optical detecting device | |
| JP2000171396A (en) | Concentration detecting device for oil deteriorating matter | |
| JP2789414B2 (en) | Small tilt angle detector | |
| JPWO2020039478A1 (en) | Chromatographic detector | |
| JPH08247933A (en) | Detection device of particle concentration in liquid | |
| WO2021032942A1 (en) | Optical smoke detector |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) |
Free format text: REGISTERED BETWEEN 20110120 AND 20110126 |
|
| PE20 | Patent expired after termination of 20 years |
Expiry date: 20240108 |