CN1137660C - Reflective fiber respiratory sensor - Google Patents
Reflective fiber respiratory sensor Download PDFInfo
- Publication number
- CN1137660C CN1137660C CNB001120603A CN00112060A CN1137660C CN 1137660 C CN1137660 C CN 1137660C CN B001120603 A CNB001120603 A CN B001120603A CN 00112060 A CN00112060 A CN 00112060A CN 1137660 C CN1137660 C CN 1137660C
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- reflective
- sensitive membrane
- optical fiber
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- shell body
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Abstract
The present invention relates to a reflective type optical fiber respiratory sensor for detecting respiratory pressure, which comprises a shell body and a tapered opening, wherein the tapered opening is connected with the shell body by a lining sleeve; a Y-shaped optical fiber bundle is arranged in the shell body; two branches of the optical fiber bundle are positioned at the lower end of the shell body, and are respectively coupled with a light emitting tube and a photosensitive tube; the merging end of the optical fiber bundle is positioned at the upper end of the inner part of the shell body. The present invention is characterized in that the upper end in the lining sleeve is provided with a reflective type sensitive film, and a gap does not exist between the sensitive film and the merging end of the optical fiber bundle. The present invention realizes the electrical measurement of the respiratory pressure, and is suitable for micropressure measurement. The present invention has the advantages of easy use, high sensitivity, simple structure and good electromagnetic interference resistance.
Description
The present invention relates to a kind of medical signals checkout gear, particularly a kind of the detection breathed the reflective fiber respiratory sensor of pressing.
Be used at present breathe and press the pick off that detects that three classes are arranged, the first kind adopts heat sensitive sensor detecting breathing air-flow, obtains the signal of telecommunication relevant with respiratory; Second class adopts thoracic impedance variation in the electrode detector respiratory, obtains associated electrical signals; The 3rd class adopts the elasticity sensing element that ties up to breast abdomen periphery, detects and the relevant displacement signal of respiratory mesothorax abdomen volume-variation.In actual applications, all there is weak point in aforesaid way.In first kind device, signal is influenced by ambient temperature easily, and the second class device can't be discerned the invalid breathing that causes owing to upper respiratory tract obstruction, and the 3rd class device is to measure indirectly to breathe to press, signal is subject to the interference such as electromagnetism of environment, and is on the low side to the useful signal detection sensitivity simultaneously.Above-mentioned situation is on the books in document CN2260574Y.
The object of the present invention is to provide a kind of employing optical fiber sensing technology, directly near the pressure variation zone that the respiratory tract outlet respiratory air flow is formed is carried out pressure measxurement, highly sensitive, anti-electromagnetic interference capability is strong, easy to use, can directly detect to breathe and press the reflective fiber respiratory sensor that changes overall process.
The technical solution that realizes the object of the invention is: a kind of reflective fiber respiratory sensor, comprise housing, bell, bell is connected with housing by lining, be provided with Y shape fibre bundle in the housing, two branches of fibre bundle are positioned at the housing lower end, and close with luminous tube and photosensitive tube Rhizoma Nelumbinis respectively, the merging end of fibre bundle is positioned at the intravital upper end of shell, it is characterized in that: the upper end in lining, reflective sensitive membrane is set, is provided with the gap between the merging end of reflective sensitive membrane and fibre bundle, passage is arranged at the intravital upper end of shell of stray fiber bundle one side, translation circuit is arranged at the intravital lower end of shell, and photosensitive tube, luminous tube is connected as a single entity.
Principle of the present invention is: merge end as fibre-optical probe with " Y " type fibre bundle, its with reflective sensitive membrane between keep a little gap, two branch end are coupled with luminous tube and photosensitive tube respectively.The light that is sent by luminous tube shines on the reflective sensitive membrane through a branch of fiber optic conduction, is sent to photosensitive tube by another bundle optical fiber again after the reflection of the formula that is reflected sensitive membrane.When reflective sensitive membrane stress deformation, the gap between itself and fibre-optical probe can change thereupon, thereby causes the corresponding change of reflective light intensity.An experiment relation curve is arranged between above-mentioned light intensity and the reflective sensitive membrane deformation displacement, and this curve comprises rising edge and trailing edge two parts.Rising edge is more steep, and there is better linearity in the stage casing; Trailing edge is milder.The present invention adopts the operation interval of curve rising edge stage casing as pick off, makes it have very high sensitivity and good linearty.The light intensity value that photosensitive tube is received by translation circuit converts magnitude of voltage output linear with it to, thereby realizes the electrical measurement of pressure.
The present invention compared with prior art, its remarkable advantage is: 1 by Fibre Optical Sensor, has realized breathing the electrical measurement of pressing, easy to use; 2, highly sensitive, be applicable to micro pressure measuring; 3, simple in structure, anti-electromagnetic interference is good.
Fig. 1 is a kind of structural representation of reflective fiber respiratory sensor of the present invention.
Fig. 2 is the light intensity and the displacement experiment graph of relation of reflective fiber respiratory sensor of the present invention.
Below in conjunction with accompanying drawing the present invention is further described.
Embodiment.In conjunction with Fig. 1, Fig. 2, reflective fiber respiratory sensor of the present invention, comprise housing 8, bell 7, bell 7 is connected with housing 8 by lining 9, be provided with Y shape fibre bundle 1 in the housing, two branches of fibre bundle are positioned at the housing lower end, and close with luminous tube 3 and photosensitive tube 4 Rhizoma Nelumbinis respectively, the merging end of fibre bundle is positioned at the intravital upper end of shell, and the upper end in lining 9 is provided with reflective sensitive membrane 2, be provided with gap 10 between the merging end of reflective sensitive membrane and fibre bundle, passage 6 is arranged at the intravital upper end of shell of stray fiber bundle one side, and translation circuit 5 is arranged at the intravital lower end of shell, and photosensitive tube, luminous tube is connected as a single entity.The present invention adopts the multimode fibre of diameter 50 μ m, and " Y " type fibre bundle 1 merges end diameter 2.5mm, fibre bundle length overall 30mm.Two branch end are coupled with GaAs infrarede emitting diode 3 and silicon light sensitive diode 4 respectively.Adopt the polytetrafluoroethylene film of aluminizing of thick 25 μ m to do reflective sensitive membrane 2.The light that luminous tube 3 sends shines on the reflective sensitive membrane 2 through a branch of fiber optic conduction, is sent to photosensitive tube 4 by another bundle optical fiber again after the reflection of the formula that is reflected sensitive membrane.When reflective sensitive membrane stress deformation, the gap 10 between itself and fibre-optical probe can change thereupon, thereby causes that accurately locate in the gap between reflective sensitive membrane of the corresponding change of reflective light intensity and the fibre-optical probe, is controlled at 0.3 ± 0.05mm.An experiment relation curve is arranged between above-mentioned light intensity and reflective sensitive membrane deformation displacement, and the present invention adopts the operation interval of curve rising edge stage casing as pick off.The current-limiting resistance of one 500 Ω of luminous tube series connection, the sample resistance of a 5K Ω of photosensitive tube series connection.From sample resistance, just can obtain being approximated to the voltage signal of linear relationship, thereby realize the electrical measurement of pressure with reflective sensitive membrane deformation displacement.In " Y " type Fibre Optical Sensor, reflective sensitive membrane is a vitals.Select different materials to do reflective sensitive membrane, transducer sensitivity is had material impact.Reflective sensitive membrane material has required good mechanical characteristic on the one hand, mainly is suitable coefficient of elasticity or compliance; Be to have high as far as possible luminous reflectance on the other hand." Y " type Fibre Optical Sensor in the past generally adopts foil to do reflective sensitive membrane, can realize the measurement of big pressure.Because the foil coefficient of elasticity is big or compliance is less, so its remolding sensitivity is lower, is used for slight pressure and detects not ideal enough.The present invention adopts the politef (thick 25 μ m) of aluminizing to do reflective sensitive membrane material.Polytetrafluoroethylene film has good compliance, at its surperficial plated aluminum film, makes it have very high luminous reflectance again.Select for use the polytetrafluoroethylene film of aluminizing to do the reflective sensitive membrane of pick off,, solved the not high enough problem of this class transducer sensitivity from the sensitivity that another approach has improved pick off.
For avoiding the introducing of the air pressure variations in cavity error between diaphragm and the fibre bundle end face, must make it to communicate with atmosphere." Y " type Fibre Optical Sensor in the past is being passage to be arranged between the space of fibre bundle on the structural design, and manufacture difficulty is very big.The present invention separates setting with passage 6 with " Y " type fibre bundle 1, greatly reduces the manufacture difficulty of pick off.Passage diameter 1mm, whole device is encapsulated in diameter 16mm, in the aluminum cylindrical housings 8 of long 40mm, by a five-core cable can be directly and physiological signal processor, physiological signal retouch to consult and be complementary, need not add adapter in addition, change-over circuit 5 easy to use is connected as a single entity with luminous tube 3, photosensitive tube 4, is arranged on the intravital bottom of shell, makes structure very compact.
Claims (4)
1, a kind of reflective fiber respiratory sensor, comprise housing [8], bell [7], bell [7] is connected with housing [8] by lining [9], be provided with Y shape fibre bundle [1] in the housing, two branches of fibre bundle are positioned at the housing lower end, and close with luminous tube [3] and photosensitive tube [4] Rhizoma Nelumbinis respectively, the merging end of fibre bundle is positioned at the intravital upper end of shell, it is characterized in that: the upper end in lining [9], reflective sensitive membrane [2] is set, is provided with gap [10] between the merging end of reflective sensitive membrane and fibre bundle, passage [6] is arranged at the intravital upper end of shell of stray fiber bundle one side, translation circuit [5] is arranged at the intravital lower end of shell, and photosensitive tube, luminous tube is connected as a single entity.
2, reflective fiber respiratory sensor according to claim 1 is characterized in that reflective sensitive membrane adopts the politef of aluminizing to make.
3, reflective fiber respiratory sensor according to claim 1 and 2, the thickness that it is characterized in that reflective sensitive membrane is the 20--30 micron.
4, reflective fiber respiratory sensor according to claim 1 is characterized in that gap [10] is 0.3 ± 0.05mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001120603A CN1137660C (en) | 2000-01-28 | 2000-01-28 | Reflective fiber respiratory sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001120603A CN1137660C (en) | 2000-01-28 | 2000-01-28 | Reflective fiber respiratory sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1306799A CN1306799A (en) | 2001-08-08 |
| CN1137660C true CN1137660C (en) | 2004-02-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB001120603A Expired - Fee Related CN1137660C (en) | 2000-01-28 | 2000-01-28 | Reflective fiber respiratory sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1137660C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2511070A1 (en) * | 2005-06-29 | 2006-12-29 | Scireq Scientific Respiratory Equipment Inc. | Self-actuated cylinder and oscillation spirometer |
| CN104015940A (en) * | 2014-03-31 | 2014-09-03 | 天津大学 | Novel intelligent clothes with warning function |
| CN105059571A (en) * | 2015-08-05 | 2015-11-18 | 安徽贵谷电子商务有限公司 | Novel intelligent garment with warning function |
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2000
- 2000-01-28 CN CNB001120603A patent/CN1137660C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1306799A (en) | 2001-08-08 |
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