EP1230538A1

EP1230538A1 - Cap

Info

Publication number: EP1230538A1
Application number: EP00956094A
Authority: EP
Inventors: Matthias Lau
Original assignee: Sentronic GmbH Gesellschaft fuer Optische Messsysteme
Current assignee: Sentronic GmbH Gesellschaft fuer Optische Messsysteme
Priority date: 1999-11-16
Filing date: 2000-07-21
Publication date: 2002-08-14
Also published as: WO2001036950A1; AU6818800A; DE10083540D2

Abstract

The invention relates to a cap (1). A layer containing a fluorescent matter is arranged on a surface of said cap, whereby said surface is directed towards the outside. Said layer can be oxygen-sensitive for instance. The cap can be put on a connecting piece (7), wherein at least one optical waveguide is received. Fluorescence exciting light is directed to the layer the containing fluorescent matter, by means of said connecting piece and the optical waveguide. The fluorescent light is directed to an optical detector by means of the optical waveguide or a second optical waveguide. Intensity of the fluorescent light can thus be measured. The inventive cap that can be produced in a cost-effective manner and can be exchanged easily is provided with a swelling (5) that extends along the inner lateral surface thereof or protruding studs that are distributed over the circumference. Said studs engage with a ring groove (6) in a positive fit when the cap is in put on the connecting piece which is provided with the optical waveguides, whereby said ring groove is embodied on the outer lateral surface of the connecting piece.

Description

cap

The invention relates to a cap according to the preamble of claim 1, as can also be advantageously used, inter alia, in a device which is described, for example, in WO 98/52022 A1.

Such a device is suitable, for example, for determining the oxygen content or the oxygen partial pressure in different fluids. Various areas of application, such as medicine, the food industry or environmental technology, are easily conceivable here, so the oxygen content can also be found in relatively highly viscous media, e.g. in the pulp of fruit or vegetables.

The measuring principle is based on the attenuation of fluorescent light as a function of the respective oxygen concentration. In this case, a layer which is applied to a carrier and contains at least one fluorescent substance is used and irradiated with a corresponding light which has at least one wavelength with which fluorescence can be excited. Since the excitation takes place with constant intensity, the measured intensity of the fluorescent light is a suitable measure for determining the respective oxygen concentration. In addition to the measurement of the absolute value of the fluorescence intensity, the decay time of the fluorescence or occurring phase shifts can also be evaluated.

However, since the fluorescent substances used for this purpose, e.g. ruthenium II complexes, can only be used for a certain period of time, since they If the layers are subject to "bleaching" (photo bleaching), the layers must be replaced by new ones at more or less large intervals.

If the invention is to be used in medical technology, a corresponding exchange is normally required for each individual patient in order to avoid the risk of infection.

It is therefore an object of the invention to provide a way of producing a cap with a correspondingly applied fluorescent coating as inexpensively as possible and of being able to replace it in a simple and reproducible manner.

According to the invention, this object is achieved with a cap which is designed in accordance with the features contained in claim 1. Advantageous embodiments and further developments of the invention result from the features contained in the subordinate claims.

The cap according to the invention can be produced relatively simply and inexpensively using a plastic injection molding process, into which a correspondingly coated carrier can optionally be inserted and fixed subsequently. There are some prerequisites for the plastic to be used. It should have some degree of elasticity to make it relatively secure and firm on an appropriate one

To be able to plug on the connector. In addition, the elasticity is important in order to hold the carrier resiliently in the cap, as will be described below. In addition, the plastic used should be thermally and chemically resistant, so that sterilization is easily possible and that no toxicological impairments can occur.

Is the one containing the fluorescent substance

If a layer is applied directly to an outer end face of the cap or a film coated in this way is glued on, a transparent plastic is required. On the cap according to the invention, a circumferential bead is formed on the inner lateral surface, which in the plugged-on position of the cap can positively engage in an annular groove formed on the outer lateral surface of the connecting piece, and thus a relatively firm hold of the plugged-on cap on the connecting piece under reproducible conditions can be secured.

This bead, which is formed on the inner lateral surface of the cap and the annular groove formed in the outer lateral surface of the connecting piece, is arranged and dimensioned such that the spacing of the bead starting from the inside of the upper end face of the cap or of the carrier is somewhat smaller is, as the corresponding distance of the center axis of the annular groove, which is formed on the outer circumferential surface of the connector, acts, when the cap is attached, an additional tensile force with which a minimum distance between the inner cap or carrier surface and the end face of the connector with the openings the at least two optical waveguides can be reached, which enables more favorable optical conditions, in particular for the light coupling of the fluorescent light.

To increase this effect, ie favorable conditions To secure nisse for the application of tensile force, it is favorable to form the annular groove in a wedge shape.

The cap according to the invention with a coated carrier has an opening on one end face, which can also be referred to as a measuring window. This opening releases part of the coating which is formed on the carrier, so that the sensitive layer for measurement can be in contact with the measurement environment. The shape of this opening can be chosen differently from the circular shape so that the influence of scattered light is reduced.

On this side of the cap there is formed an inward-pointing annular bead or the lip which defines the diameter or the edge of the opening, on which in the assembled state the outer edge of the carrier lies against the coated surface. In this position, the carrier can be fixed to the cap once by attaching it with a suitable binder (silicone adhesive). Another possibility is thermal welding, which is applied using a suitable polymer, for example on the outer edge of the carrier that is in contact with the annular bead or the lip, and cured by a single heat treatment, so that an intimate bond of the Ring bead or lip area can be achieved with the polymer prepared in this way. With selected adhesives, these can e.g. can also be cured with UV light.

However, thermal welding can also take place by external heat supply through the cap, with at least the cap material, ie the material used Plastic is melted locally and a connection cap material and carrier can be achieved. If a carrier made of plastic is used, the edge area can also be heated and melted accordingly, so that an even better connection can be achieved, which is not achieved with a carrier made of glass that can also be used and is generally not necessary.

A further possibility for fixing the carrier in the cap consists in the formation of at least two projections on the inner circumferential surface of the cap, over which the carrier is pushed after insertion through the second opening, which is larger compared to the opening serving as the measuring window can be and with the help of the carrier is then held positively against the ring bead or lip.

Of course, combinations of several of these fixation options can also be used.

In any case, however, the resilient effect of the correspondingly angled lip has an advantageous effect, since the support provided with the coating can be held without play.

The cap according to the invention can be easily attached to a connector in which at least one optical waveguide is received, with which the

Fluorescence excitation and the detection takes place sequentially.

However, at least two optical waveguides can also be used, at least one of the fluorescent excitation and a second for measuring the fluorescence intensity.

The end faces of the optical waveguides can be flush with the end face of the connector and light with at least one wavelength that excites fluorescence in the layer is directed onto the layer with at least one of the optical waveguides and the fluorescent light is directed onto an optical detector with at least one further optical waveguide directed with which the intensity of the fluorescent light can be measured.

The end face of the connection piece pointing in the direction of the layer containing the fluorescent substance can advantageously consist of a transparent material, e.g. glass or an even more scratch-resistant sapphire or other suitable material. In this case, it is expedient to guide the light entry and exit openings of the optical waveguides to the interface of this transparent material, so that there is no direct contact with the carrier and a certain distance from the layer can be maintained. It may be advantageous to use the inside of the cap, e.g. to form an optically transparent, elastically deformable intermediate layer on the underside which, when the cap is attached, is pressed against the corresponding end face of the connecting piece. A suitable material for this is, for example, silicone.

However, focusing optical elements locally assigned to the light entry and exit openings can also be arranged or, for example, formed on the carrier. With such a choice of material and a corresponding arrangement, several advantages can be achieved. This applies on the one hand to maintaining a certain distance, the utilization of the apertures of the optical waveguides for the fluorescence excitation and the measurement of the fluorescence intensity, as has been mentioned for example in WO 98/52022 AI.

On the other hand, the carrier used can be made correspondingly thinner, which, if temperature control is required, has a favorable effect when replacing a cap, since the time required for temperature control can be shortened due to the lower mass to be temperature-controlled.

In addition to glass and ceramics, other suitable transparent plastics can also be used as the carrier material. Such supports with a thickness, preferably ≤ 1 mm, can then be separated from the flat, layered plastic substrate by a stamping process with sufficient accuracy after the application of the layer containing the fluorescent substance, and the individual supports, such as already described, can be used in a cap according to the invention.

In the case of a plastic carrier, it may be necessary to form a barrier layer between the carrier and the layer containing the fluorescent substance which is leaky for the various fluids. With such a barrier layer it can be prevented, for example, that water gets into the plastic material and consequently corresponding measurement errors can be avoided. Besides, too prevents gases from diffusing into the plastic material and, for example, diffused oxygen increases the required time constant or the measurement error.

Such a connector can be an intrinsic part of a measuring head, such as e.g. is described in WO 98/52022 AI.

Another possibility is to guide the optical fibers over a greater distance into a device in which a suitable light source, an optical detector and electronic elements for control and evaluation can be accommodated. The last-mentioned variant has the advantage that the connector with the cap attached is made relatively small, so that it can be handled more easily for a wide variety of application options.

In order to facilitate the replacement of the cap on a connecting piece, both parts are advantageously conically tapered, at least the inner lateral surface of the cap representing a corresponding conical taper in the direction of the surface bearing the layer or the opening serving as a measuring window. For manufacturing reasons, a rotationally symmetrical design is proposed. However, other geometric shapes, such as truncated pyramids instead of a truncated cone for the connecting piece and corresponding negative shapes of the inner contour of the cap, can also be used. Due to the conically tapering design, a cap designed according to the invention can be used very easily without great skill

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P i- ¹ N H- tΛ ⁾ SU rt> H- d Hj Hj H- tr Hi H- tr ¹ Ω Hj H-

P CQ Φ TJ N d P SU 3 Φ Φ Φ SU = tr CD Φ φ SU rt TJ ra TJ P Hj 3 rt

3 Φ φ

certain or a certain type of such a cap can only be placed on very specific, correspondingly provided with one or more cutouts and the shape, size, number and arrangement of such approaches can represent a coding.

There is the possibility of producing uniformly designed caps with a plurality of approaches, predetermined breaking points being provided on the approaches, so that after the cap has been fitted with a specific carrier and a layer containing fluorescent substances, one or more such approaches are simply broken off manually and the Cap can be coded accordingly.

However, predetermined breaking points can also cause approaches to break off when a cap is removed after use, so that such prior use can be easily recognized visually, which is particularly important in medical and food technology applications where multiple use is to be excluded.

In any case, both the extension and the recess can be designed in the form of a part circle or wedge, so that a relatively large area can be reached, which prevents the attached cap from rotating during operation.

An anti-rotation device can also be achieved with a polygonal inner profile, for example a hexagonal inner profile, which is formed on the edge of the cap pointing in the direction of the connector, in connection with a correspondingly profiled connector, J to F ¹ H

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P LQ rt P P rart φ Ω ö F- F- tr CQ Hl F- ft Φ F- rt ft SU Φ Φ LQ P

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Φ 3 3 3 φ Φ 3 CD Φ tr 3 F- Φ P d Φ ra rt - 3 Φ HJ tr Φ tr tr rt F-

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Φ Hi h- ¹ Hj Φ; v F- 3 Φ Hi tΛ P rt 3 Φ P s; ft F- <rt F- ft F- 3 d Hh su

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Φ tr P d TJ SU LQ Φ Φ rt Hi tΛ Ω 3 LQ F- ι_ι. Hj rt 3 ra 3 Ω Ω su

F- - ffi P - d * a 3 Φ ra Φ φ tr LQ h- ¹ Φ Φ Φ? R tr ft d

Φ Ω SU LQ ra F- F- SU Hi ra ≤ P Hj rt Φ d ft tr ≤ «φ Φ Φ Hh

CD tr φ h- ¹ N Ω d P 3 ft Φ Φ ft ft Φft F- P Φ CD Φ SU F- ^ a ra d = HJ

Φ rt P tr Hi F- d tr 3 LQ rt Φ 3 Hi Φ φ F- Φ Ω LQ 3 F- HJ TJ 3 F- CQ Φ a rt F- Φ tr LQ P Φ 3 ft P 3 3 Hj tr Ω ft TJ Φ X SU CQ Φ F-

LQ ra Φ P F- Φ d S Φ rt 3 ft ^ tr Φ Φ CD F- d F- P P

S Φ TJ F- ft Φ F- φ rt Hl H- F- 3 ß - Hj ω SU = Φ SU Φ P Φ Hh LQ rt φ m Hj rt Φ Hj ft rt F- F ¹ 3 Hj - rt SU F- Ω CΛ ⁾ CQ h- ¹ Hj d tr HJ LQ CQ CD

HJ TJ φ φ rt Φ - 3 SU SU: ft 0 P rt tr F- d 3 φ d Φ SU TJ 0 ft Φ Ω Hj SU P d Ω H • ft Hi 3 rt F- LQ Hi P ft Hj 3 CQ d Hj H- ¹

Φ F- tr Ω d - SU o CQ tr P SU Hh CQ Ω LQ LQ JV LQ Ω Hi Φ Ω

P Ω Φ tr SU Ω 3 LQ Φ 3 Φ ft 0 = tr Φ d Φ tr Ω tr tr P F- d tr F- ja φ φ F- CQ SU Hh rt F- 0 ra

F- tr ft Hi 3 ra Hi P Hj F- 0 ra s 0:

3 d 0 ft tr φ

? Φ ft TJ Hi P ft 3 3 tr Φ Φ CD

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P ft? Φ Φ ft Hj LQ CD P Φ φ d P d CQ LQ tr F- 3 φ ft

P 0 3 F- φ ft Hi ra 0 3 ra N rt rt Ω LQ TJ φ CD Hj &

P 0 H! «Hi Φ s ft ra LQ kills F- ~ φ d tr F- HJ TJ ra

3 Φ P 3 tr SU 0 rt φ SU Φ u φ Φ Φ Φ Φ φ CQ 0 HJ Ω

• F- SU Φ 3 Φ tr J Hj ω Hi 3 Hi -> P N HJ ft <! ra 3 F- rt H 0 tr

P d P φ HJ Φ TJ 3 CQ Ω Φ d Φ F- 0 rt Ω F- Hi

^ Hh 3 X? F- φ CD Φ tr W LQ ft N LQ Φ P Φ Hj d = t tr h- ¹ F-

N d

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F- φ tö ra

Φ 3 F- d ~ TJ F- Ω ra 3 d P 0 CD 0 F- Hj Φ rt

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Φ CQ 3 a Φ Φ φ CD LQ P φ

3 PPP φ

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LΠ o LΠ o LΠ o LΠ

rt LQ ra 3 TJ Hj x s: ft N CQ <! ö tr ft LQ CD 3 φ tsi su H rt 3 tr rt ft

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N Φ F- SU φ ft Φ tr rt F- Ω Φ d = - F "ft Hi F- HJ φ LQ 0 = F- tr

, P d SU Hj Hj F- Hj ra Φ Φ LQ tr d F- tr Hl d Φ rt F- 3 3 3 u Φ ö Hi 3) Φ Φ Φ Ω P Hi Φ Hi 3 Φ SU 3 Φ Φ Ω Φ 3 Hh d F- for ft ~ P F- tr CD? r ra - Hi 3 SU: LQ F- Hj tr rt Φ 0 ra

F- "ft Φ rt F- TJ SU rt F ¹ Ω CQ Ω su φ F- 3 Hj LQ ft

Φ F ¹ ft ft Φ Φ F- md 3 0 tr ¹ P φ ft F- ft tr LQ tr TJ * a Hi CO 3 φ φ

F- CD O Φ P LQ CJ 3 ra d P Ω F- φ Φ φ Φ rt TJ 0 Ω SU SU F ¹ 3

P Hj Hj Φ Φ rt ω φ F- Hi Φ LQ Hi 3 Φ Φ Hi 3 tr d rt φ φ d rt 3 CΛ P Φ rt 3 rt rt φ φ Φ 3 SU: Hi 3 φ Ω F- CQ tr

Hj 3 F- rt rt F- d = F ¹ F- TJ Hi 3 ft 3 ft F- CΛ d su F- Φ tr 0 φ Φ rt h 3> -3 OF ¹ F ¹ Ω F- OO Hi SU ft F - 3 Φ 3 d 3 O HJ 3 3

CΛ Φ F- Hj Hi F- € Φ 3 F ¹ φ tr ra Φ Φ ft 3 LQ Hl F- Φ Hl Φ Φ SU

TJ Hj X Φ SU: Hi Ω Φ Φ LQ CD F- N 3 Φ LQ rt SU F ¹ P s 3

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Hj Hj φ Hj P Φ 3 ft Hj Hj rt rt su CD Φ TJ ra Hj Φ 3 rt P ft Φ

CD F- rt rt CQ F- Φ tr s ≤ 3 P TJ SU Hj 3 Z Hj rt Φ 3

Ω ra φ SU tr Φ tr P HJ F- 2 Φ ft 3 m Φ Ω CD Φ Φ F- tr 3 tr Ω ≤ Hi d su P Φ F- Φ 3 φ N F- Φ d tr Ω P HJ CD su ( Λ

F- tr Φ H ra F ¹ CQ ra 3 F- H! F- Ω LQ CΛ φ JV Hl rt tr ft Ω F ¹ JV rt

Ω φ HJ F- rt F- Ω F- Hj tr Flft Φ tr Φ Hi F- SU CQ F- SU Φ tr rt 0 = H! tr P ft 3 φ Φ rt tr Φ SU: rt 3 φ tr Φ Hl Φ 3 P rt d φ d 3 Φ 3 F- rt ra Φ ft F- P F- Hi Hi LQ 3 P Φ P d = 3 Φ P φ 3 ft Ω - P 3 Ω

Ω P d 3 ft <F- rt Φ d Φ • «3 - CD Ω ft φ tr Φ tr

SU tr 3 φ φ Φ φ Hj 3 HJ tr Hj rt tr SU X 3 Φ 3 Ω

SU LQ 3 ^ tr Hh ft φ ft ft N rt Φ F- d φ 0 φ> 0 = 0

CD SU ra CΛ Φ Φ F ¹ P φ sS Φ Hi co CΛ 3 TJ 3 d Φ P d ft rt P LQ 0 Ω ft P Hj SU: ft ra HJ • Φ CQ rt Hi? PP φ

CΛ d P φ J tr Φ ft Ω Φft CD ta Hi SU Hj F-> a ft rt φ ft ra

Ω P ~ 3 rt F- P o Φ tr HJ φ * M F- d 3 ft d m SU Hi Hi 3 tr LQ SU: F- Ω ft P φ HJ φ SU F- P 3 Φ 3 Ω Hi d 0 Φ ft

F- d CΛ CQ tr l_l. Φ t " ¹ F- TJ 3 - LQ ft 3 ft tr tr Ω 3 tr φ

Ω ≤ 3 Φ Ω rt φ Hj dd ^ P TJ ft φ F- Φ Φ J F- ö Φ HJ tr Φ 3 tr SU 3 Hi SU Φ HJ Hj φ 3 F- Φ 3 φ CD F- 3 rt F- F - «SU φ su P ft rt TJ Hi F- tr HJ - P & Hj - Ω Φ Hi 'a ra rt rt SU rt d F- PP CD TJ φ Φ 3 d Φ N Hh SU tr SU su

"<Φ rt TJ Hj Hi LQ • 0. TJ φ r- ¹ HJ LQ P 3 ft ft F- SU d N Ft F ¹ F ¹

CD Hj Φ TJ SU F- φ rt SU 3 φ LQ ft Φ φ Φ Λ tr 3 F "M rt Φ φ P φ LQ ft F- F" F- rt 0 = 3 φ Hj Hj tr rt Φ tö N Hi CD

Φ Hi tr ra F- Φ φ HJ rt P F- LQ SU φ 3 s 0 F-

3 SU φ TJ P P d 3 <F "<! D 0 = CΛ F- 3 5S CD Hj j: ra

CΛ HJ F- su φ rt CD SU F- 0 m Hh rt 3 ra Φ φ F- 3 SU rt

SU Ω ^ 3 Hj 3 Hi φ Φ d J Ω 3 LQ H F- 3 HJ F- 3 φ SU d tr LQ φ h- ¹ rt F- Hh tr Φ 3 Hj Φft ft rt rt F-

Hi F- LQ Φ P d - rt LQ φ rt tr> tr d 3 HJ φ Φ F- Ω Φ F-

LQ Ω φ rt 0

0 Φ φ F- • d F- 3 Φ Hi tr 3 LQ 0 - 0 TJ φ φ 3 Hh LQ P

P rt

LO LO M to H

LΠ o LΠ σ LΠ o LΠ

φ d = N Ω N ö ^> a tr ¹ F ¹ LQ SU SU LQ Hi X 3 Hh in • a ≤ Hh SU rt 0 ü X F- 3 ra 2 Φ tr

F- tr d tr d SU H F- Φ Φ tr Φ SU F- Ω d = φ d = d HJ tr F- 3 F- Ω SU F- Hi

3 Φ HJ Φ 0 tr d Ω rt Φ CD Φ Φ d 3 rt d tr Hi Hj Hi Hi SU Φ φ Φ rt tr Ω 3 SU

Φ HJ p HJ Φ 0 tr N F- 0 Hj F- 0 3 0 F- ft 3 HJ tr ft rt P tr Φ Ω ft ft F- Hj rt rt LQ LQ Hi d Hj Ω tr φ ft Φ ra Φ CΓJ rt F- Φ F- LQ tr ι-3 Φ Φ tr ¹ P Φ Hi LQ PO SU 3 φ P Φ tr φ 3 F- F- TJ Ω Φ M rt SU rt rt

HJ Ω Hj F- φ x CD d = Φ Φ Ω d φ CD Φ rt CQ rt ra Φ 3 SU CΛ tr SS CD tr rt 3 HJ φ x 3 Ω P SU N tr 3 rt tr Ω rt N F- Φ N Φ rt X φ Hj rt F- Φ Φ u Φ LQ SU 3S

3 d φ tr 3 Φ Hj $ u Φ F- tr Φ F- 3 Hj F- P F- SU 3 Φ F- Ω Hi 3 Hj P 3 φ p P F- rt 3 P d 3 Hj Ω 3 Φ N CQ Φ 3 3 F- PH (tr ft SU CQ Hj d LQ ft s. Ft NPP tr ft Hi d Ω HJ N 3 3 XH rt 3 rt Φ tö SU dd TJ ft

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F- φ P Φ d rt Hj ^> Hi Φ 0 = F- 3 φ F "Hj TJ 3 HJ SU tr 0: P Ω F- SU Φ rt ta

Φ <! F- F "Hi CD Φ SU Φ F- LQ X 3 F- CΛ ≤ TJ LQ TJ φ P P tr 3 3 Φ F-

CD φ 3 SU: φ Hj CD ft F ¹ CD Ω F ¹ 3 CΛ • Ω rt φ F ¹ d TJ 3 • φ 3 Φ 3

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Φ F- Φ Φ Φ ra CΛ> Φ o Φ F- Φ Φ Ξ ^ * F- ra F- Hl Hj tr m Hj ft φ M

HJ Φ LQ X Hi 3 TJ HJ P Hj F- SU F- Φ 0 Φ LQ φ Ω Φ Φ Φ Ω

Φ ft φ φ rt ~ Hj Φ ft ft N rt F- F ¹ ft F- 3 ra Φft HJ tr F- HJ $ u tr

F- Φ tr F- d φ LQ su Φ d 3 X Φ 3 Φ 0 Φ tr SU CΛ 3 F ¹ d Φ,

Ω 3 φ P HJ ft Ω d 3 HJ CD Φ Φ 0 = Φ HJ PP Hi 3 SU rt rt Φ F- Hl 1 tr Φ 3 φ Φ F- tr P 3 Φ F- 3 <P 3 Φ ft Ω rt SU 3 d Hi F- 3 Ω LQ co

Φ P φ P Φ Φ LQ Cß tr 3 rt Φ PF ¹ 3 Φ X tr CQ Ω Ω SU H {tr φ Ω

3 α = P CD rt Φ Φ tr HJ Φ SU: 3 SU Φ J tr N tr P 3 CQ Φ tr tr

3 tr ¹ Hl tr Hl F ft d φ O 3 Hi su 3 P 3 • a Φ 3 3 HJ rt d CD Hh 0 P HJ F-

F- F- SU Φ d = F- P \ -> Hh »F ¹ F- LQ 3 3 φ 3 d TJ F ¹ SU Ω rt Ω F ¹ Hi Hj Ω ft tr Hi rt CQ ft Φ d • -3 Ω C F- 3 SU SU: Ω 3 Ω tr tr ft tr 0 CD F- 0 Φ Ω F- 0 d Φ Hi tr Φ 3 3 HJ Ω tr SU tr rt

Φ rt CQ Φ ft rt X ft rt Φ 3 X 3 tr Φ SU Hj P CD SU: Φ Hj ft F- φ tr Φ t _Λ ) rt

F- Ω F- F "SU F- <! P SU rt CD 3 Φ rt LQ 3 ft Φ rt 3 Φ 3 Φ X

P Φ SU Φ Φ Φ Φ rt ft CD Φ Φ LQ ra Φ <; Φ ft Φ CQ rt rt ≤ SU

Φ d d F- Hj tr Φ φ Φ Hj φ N HJ 0 HJ φ P rt Φ Φ Φ 1-3 d φ 3

HJ hh P d rt LQ 3 CQ SU P P F- <Hi φ CD HJ CD 3 3 F- HJ p Hj p

Φ rt LQ 3 Hh Φ Φ rt F ¹ Φ 3 ^> a Φ φ 3 Ω rt ft tr p SU: ft ft

0 P HJ rt SU rt tn SU: rt P SU J F "Φ SU φ CD HJ CD 3 φ r? 0 Hj LQ N tr Φ <! Ta JS 0 SU J Φ LQ φ

HJ CQ rt F- F- φ Hj 0 Hj HJ SU HJ Φ <τl p rt tr

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F- P Φ Hi CD H! P P Φ Hi CD tr £ Φ ft tr N 0 Φ $ u TJ N Hj HJ

CQ LQ 3 £ Ω P 3 LQ F- F- Φ F- F- Φ F- H SU F- Hj F- 0 d Φ d tr 3

Ω φ ft ft Φ tr rt Ω CQ φ 3 tr 3 Φ HJ F- Hi Ω ft TJ Hh 3 N Φ F- su t P Φ F- F- CQ ft p- rt F- N Φft ft t- ¹ Ω rt tr φ ft rt SU F- ζ 3 φ d

Φ P O Φ 0 CD φ • d CD Φ Φ Φ F- tr rt Hj u F- ft d p Ω

3 X Φ ft φ C ^Q ft CD 3 rt F- P 3 Ω Φ CD φ 3 3 CD F- Hl

SU ft LQ F- tr

PF ¹ SU F- F- LQ Φ 3 Φ tr φ rt F- p Ω Φ LQ Φ d φ g

P • F- P 3 Φ 3 Φ - tr Φ P rt F- CQ tr φ CQ p 1 see below

P 1 1 F- rt 3 3 CQ 1 rt 1 d P Φ Hh

Interface layer may be required.

In certain applications, it can be problematic if condensate formation occurs and the condensate formed is deposited directly on the cap and then on the sensitive layer.

However, since the cap according to the invention is to be produced inexpensively from a plastic material with the known poor heat conduction properties, the undesirable condensation occurs precisely on the surface of the plastic.

Since heating is often hardly possible, and if so then it is relatively expensive, particles with a higher thermal conductivity than plastic can counteract this if they are embedded in the plastic material. In this way, relatively small-sized metal particles can be stored in the plastic.

This aspect is of particular importance if the cap according to the invention in connection with a cuvette through which a gaseous measuring medium, for example the breathing air, is led and where the oxygen concentration is measured.

To reduce or eliminate the effects of scattered light from the surroundings, it may be necessary and advantageous to shield the layer (s) containing the fluorescent substance (s).

For this purpose, a cover can be used, which is formed directly on the corresponding end face of the cap, or can be placed and fastened there. At the very least, that should be in the direction be light-absorbing on the sensitive surface, so that reflections can be largely avoided.

Such a cover can be provided, for example, with corresponding webs, in that the distance from the sensitive layer required for the supply of a fluid measuring medium is kept, at least two such webs being required. However, the number of such webs can be larger, so that the fluid measuring medium can reach the surface of the sensitive layer through the slot-shaped spacings or slots formed and undesired scattered light is shielded.

The invention will be described in more detail below on the basis of exemplary embodiments.

Show:

Figure 1 is a sectional view through an example of a cap according to the invention in longitudinal section; Figure 2 is a sectional view of the cap shown in Figure 1, taken along line A-A;

FIG. 3 shows a detailed illustration of an angled lip 3 according to FIG. 1;

Figure 4 is a detailed view of one on the inner

Shell surface of the cap formed projection;

FIG. 5 shows, as a detailed illustration, an attachment as an anti-rotation device on a cap; Figure 6 is a schematic representation of a connector on which a cap according to the invention can be attached;

Figure 7 shows an example of a carrier with an approach;

Figure 8 shows an example of a carrier with two approaches;

Figure 9 shows an example of a carrier with an optical separation layer and

Figure 10 shows an example of a cap with a cuvette.

FIG. 1 shows a longitudinal section through an example of a cap 1 according to the invention. At least the inside of the cap 1 is designed to be tapered in a rotationally symmetrical manner. In this example, on one end face, which here has the smaller diameter, a lip 3 is formed which runs around the entire circumference and is angled against the conical taper. In the interior of the circumferential lip 3 there is an opening through which the layer applied to the carrier 2 can be in contact with the measurement environment. In the assembled state, the disk-shaped carrier 2 with its coated surface lies directly against the circumferential lip 3, it being advantageously fixed in the cap 1 in such a way that a spring force effect can be achieved on the carrier 2 through the circumferential lip 3.

The carrier 2 can, as already mentioned in the general part of the description, in different ways LO O to HH

LΠ o LΠ O Lπ σ Lπ

d ^> a -3 tr rt ta ö ≤ CD SU CQ u ^ Ω su CQ H d

3 0 F- F- Φ s ^• YYH yes 3 CD -J ft ra 3 tr

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F- rt SU: Φ Φ Hj dd CD LQ d rt F ¹ Φ H Φ P tr F- Hj rt tr rt HJ Φ

Φ s. SU Ω F ¹ F- CQ ft rt P CQ Φ Hi «• H CD LO H F- φ Ω ft <F- HJ F- ^ F-

F- tr ra tr F ¹ Ω Φ ft F- tr F "Φ P rt X 3 tr $ u Φ Φ d F ¹ • a CQ

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Hl ja 3 F- ja ft ft LQ CD Hi ta F- rt Ω CQ F- 3 3 3 HJ F- tö 3

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F- LQ 3 Φ tr LQ SU 3 3 Hi 3 Φ Hi Hi F ¹ Φ φ F- Φ 3 F> F- LQ X F- rt Hi

Φ LQ HJ Z CΛ d Φ F- Φ LQ P LQ rt CD F- Φ Φ to 0 su P φ

F d Φ s Φ d rt Ω Φ 3 P Φ Φ J - CD P HJ Hl 3 3 <P SU 3

Φ F "0 HJ F ¹ F- tr INI Hj d 3 CQ F- Φ φ F- F- X Φ Φ 3 ^> ad

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3 rt tr lh F- X LQ 3 <T \ rt Ω HJ Φ Φ SU 3 0 Φ F ¹ P 0 Φ U 3 Hi Hi

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F- <! X Ω Hh Φ CQ Hh Φ d CO d ≤ SU SU 3 Φ tr F- 3 CQ F- 3 SU

3 d CD 0 0 = tr tr rt HJ tö F- F ¹ Hj 3 rt Φ P rt F- φ CQ Φ 3 TJ

3 F- HJ P Φ Φ φ Φ SU: M ta F-ft F- X rt HJ Ω CQ Φ φ TJ ft ft 3 CD P ra ft ja F- tr Ω TJ SU SU 3 CD 0 SU Φ tr φ X ra F- Φ

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Φ X φ P - F- Hj 3 Φ Φ CD Hi F ¹ Φ Φ 3 Ω d Φ P 3 d Φ F> o = F- tr 3 LQ 3 * a F- Φ φ d = HJ 3 tr Ω Hj 3 3 a 3 3 Φ SU ft 3 SU K rt F- ft rt 3 Hj Hi SU F- tr Hl F- <Hl

F- 3 P P Φ rt d d CD LQ Φ F- ft ft rt d J! <ft TJ SU d 3 SU Φ F-

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3 Q Φ rt LQ Φ TJ d Φ tr Φ F- Φ d F- F "s HJ tf d SU ra tr φ SU Φ Hl ft 3 Φ Φ 3 Ω Hj rt 3 F- ra S φ Φ

CD Ω cn

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Ω CQ F- Ω Hj Φ Φ Ω Hf CD Hl z. F "ta Φ Φ 3 N CD p φ d σ \ SU: tr SU: 3 tr Φ Ω d 3 Hi tr rt φ ft ft Φ 3 tr Φ d TJ Φ 3 3 ≤

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Φ d rt N Φ d X rt ft Φ Hj d SU Lπ φ JV rt φ SU φ CQ X Φ ja Hj

F- F- Φ HJ ω Hi Φ Hj 3 CD J Hi Φ Φ φ F ¹ 3 F- 0 MOUH ft

3 <! LQ φ CD SU P ft CD TJ ft 3 ft 3 F ¹ 0 3 CD tr p to Φ

LQ SU F ¹ SU 3 Q Hh Φ CD Φ SU F- ta φ rt ra d P 3 S Φft 3

HJ Φ d rt rt J HJ & rt Hi 3 ft F- P P 3 F- Φ Φ HJ Φ ft

Φ Φ F- CD 3 d = su 0 d = F- LQ 3 F- 3 0 Φ ft Φ p F- Hh ra SU

F- 3 Ω LQ SU Ω ft TJ HJ Ω 3 φ Φ Φ X LQ 3 3 H {ra Hj

Hι rt tr Φ P X Φ TJ ft X Hj 3 φ HJ 1 rt F- rt φ SU: LQ φ Φ Φ Φ CD Φ φ Φ rt Hi 0 = φ 3 φ

3 HJ P ra CD 3 P

In the sectional view according to FIG. 2, the formation of the notch 13, which serves as a vent, is clearly recognizable.

FIG. 3 shows an enlarged representation of the detail of the lip 3 formed on the cap according to the invention, the lip 3_ points into the interior of the cap 1 and is angled in the direction of the carrier 2. This bending leads, in conjunction with a certain elasticity of the plastic material used, to a spring force effect on the carrier 2, which is held in a correspondingly fixed manner, so that freedom from play can be ensured during the hold.

In a form not shown, a circumferential ring can also be inserted between the carrier and the projections 4, by means of which a pressing force on the carrier 2 against the lips 3 can be achieved over the entire circumference. Such a ring can consist of an elastomer.

To hold the carrier 2 inside the cap 1, a plurality of projections 4 are formed on the inner circumferential surface of the cap 1, as can be seen in detail in FIG. 4 as one possibility. The projections 4 should have a cross section (corresponding to the section in FIG. 4) which is designed in the form of an isosceles triangle, the shorter leg 8 fixing the carrier 2 in the assembled state and the carrier 2 when inserted into the interior of the cap 1 over the longer leg 9 of the projection 4, can be pushed relatively easily with a smaller angle of inclination and the larger angle of inclination of the leg 8 when Hold of the carrier 2 but has a favorable effect.

FIG. 5 shows a detail of a projection 10, which is designed here in the form of a part circle, at the rear edge of the cap 1 according to the invention.

The cap 1 is then held and positioned when it is plugged onto the connector 7 such that the projection 10 is inserted into the recess 11 formed on the connector 7 and through the

Positive locking a rotation of the cap 1 on the connector 7 is prevented.

In the forms for the extension 10 and the recess 11 shown in FIGS. 5 and 6, both are of the same design on both outer sides, so that a purely translational movement is possible within narrow limits when the cap 1 is pushed onto the connector 7 and also when it is removed is and due to the mutually adapted outer contours of the approach 10 and the recess 11 a rotation is almost impossible.

In a variant not shown here, however, a bevelled sliding surface can also be provided on the recess 11 on one side, which, with a slight rotation of the attached cap 1, also results in a translational movement for pulling off the cap 1, which in connection with the conical design, the inner surface of the cap 1 and the outer surface of the connector 7, the removal of the cap 1 can facilitate.

It can also be seen in FIG. 6 that the annular groove 6 on the outer lateral surface of the connecting piece

φ tr ft yes Hh £ ü d ft H 3 ft rt P Hj X CQ rt 3 d o 0 ft <J ^! rt Φ £ 0 X

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LO O t to H H

LΠ o LΠ o LΠ o LΠ

an optical separating layer 14, which divides the extension 2 'into two parts in the optical sense. The optical separating layer 14 can consist of a reflective or also a light-absorbing material. Such optical separating layers can analogously also be used or present in a carrier 10 or between adjacent extensions 2 '.

In the example shown here in FIG. 9, only one of the angled surfaces is provided with a layer 16 containing the fluorescent substance, and the other part of the attachment 2 ', which is separated by the optical separating layer 14, can be used to obtain reference values ,

The examples shown in FIGS. 7 to 9 can be produced as plastic injection molded parts, an optically transparent plastic being used.

The example of a carrier 2 according to FIG. 9 can, for example, be produced from two parts which can then be glued together in the region of the optical separating layer 14.

An example of a cap 1 with a cuvette 15 is shown in simplified form in FIG. At least one inflow and outflow is present on the cuvette 15, through which a flowing fluidic sample can be passed. In the case of a cuvette with, for example, several inflows, different components of a sample can be mixed with one another and detected within the cuvette 15.

The layer 16 containing the fluorescent substance forms part of the inner wall of the cuvette

15 or is applied there or a coated element is arranged there and the fluid

The cuvette passes sample directly past layer 16.

In the example of a cap 1 shown in Figure 10, it is formed in one piece, i.e. the cuvette 15 is an integral part of the cap 1. However, it can also be placed as an extra part on a cap, which has already been described in the other examples. In this case, an opening is formed in the cuvette 15, so that the fluidic sample can be guided past the layer 16 and detected.

Claims

claims

1. A cap is attached to a layer containing a fluorescent substance on an outward-facing surface, which layer can be plugged onto a connector in which at least one optical waveguide is received, with at least one optical waveguide light at least one wavelength preventing the fluorescence in the Layer stimulates the layer and is directed by a or at least one second optical waveguide fluorescent light onto a detector, characterized in that a circumferential bead (5) or protruding projections are formed on the inner circumferential surface of the cap (1) / are, which in the plugged-on position of the cap (1) on the connection piece (7) engages in a form-fitting manner in an annular groove (6) formed in the outer lateral surface of the connection piece (7).

2. Cap according to claim 1, characterized in that the fluorescent

Layer (16) is applied to an optically transparent support (2) and the support (2) is arranged in the cap (1) with its layer (16) containing the fluorescent substance facing outwards on one end face.

3. Cap according to claim 1 or 2, characterized in that the bead (5) or the approaches and the annular groove (6) are arranged and dimensioned so that when attached Cap (1) of the carrier (2) or the surface provided with the layer (16) is subjected to tensile force on the end face of the connecting piece (7).

4. Cap according to one of claims 1 to 3, characterized in that in the interior of the cap (1) in an attached position on the end face of the connecting piece (7) lying layer of an elastically deformable, optically transparent material is present.

5. Cap according to one of claims 1 to 4, characterized in that on the end face of the cap (1) an opening with an inwardly facing first annular bead or lip (3) is formed, and / or the carrier (2) with its outer Edge rests on the inwardly drawn annular bead or lip (3) and is held there with a binder, by thermal welding and / or in a form-fitting manner by means of projections (4) and / or a clamping ring formed on the inner circumferential surface of the cap (1).

6. Cap according to one of claims 1 to 5, characterized in that the lip (3) is angled pointing towards the end face of the connecting piece (7).

7. Cap according to one of claims 1 to 6, characterized in that the outer surface of the connector (7) and the inner surface of the cap (1) are tapered.

8. Cap according to one of claims 1 to 7, characterized in that the annular groove (6) is wedge-shaped.

9. Cap according to one of claims 1 to 8, characterized in that at least two projections (4) are formed on the inner lateral surface of the cap (1).

10. Cap according to one of claims 1 to 9, characterized in that the projections (4) are arranged at the same angular distance from each other.

11. Cap according to one of claims 1 to 10, characterized in that the projections (4) are wedge-shaped, cone-shaped or pyramid-shaped.

12. Cap according to one of claims 1 to 11, characterized in that the cross section of the projections (4) forms an isosceles triangle.

13. Cap according to claim 12, characterized in that the leg (8) of the triangle, which points in the direction of the annular bead or lip (3), shorter than the leg (9), which points in the direction of the connecting piece (7) , is.

14. Cap according to claim 12 or 13, characterized in that the length ratio of the shorter leg (8) to the longer leg (9) corresponds to 1/3 to 2/3.

15. Cap according to one of claims 1 to 14, characterized in that at least one extension (10) is formed on the cap (1) as an anti-rotation device which, when the cap (1) is attached, into a recess (11) formed on the connecting piece (7) ) engages positively.

16. Cap according to claim 17, characterized in that the projection (10) and the recess (11) are part-circle or wedge-shaped.

17. Cap according to claim 15 or 16, characterized in that a bevelled sliding surface is formed on one side of the recess (11).

18. Cap according to one of claims 1 to 14, characterized in that a polygonal inner profile is formed on the cap (1) as an anti-rotation device, which, when the cap (1) is attached, can be positively pushed onto a polygonal profile formed on the connecting piece (7).

19. Cap according to one of claims 1 to 14, characterized in that the cap (1) on the connector (7) can be locked with a bayonet lock.

20. Cap according to one of claims 1 to 19, characterized in that a circumferential annular groove is formed on the cap (1) and / or on the outer circumferential surface of the connecting piece (7), in which an O-ring engages positively in the attached position ,

21. Cap according to one of claims 1 to 17, characterized in that on the cap (1) on the outside a thickening (12) for receiving a semiconductor chip or as optically detectable information, a surface structure is formed or an imprint is applied.

22. Cap according to one of claims 1 to 21, characterized in that in the inner jacket surface of the cap (1) is formed at least one notch up to the edge opposite the end face with opening (13).

23. Cap according to one of claims 1 to 22, characterized in that the carrier (2) consists of a transparent glass, ceramic or plastic material.

24. Cap according to one of claims 1 to 23, characterized in that the carrier (2) has a thickness <1mm.

25. Cap according to claim 23 or 24, characterized in that between the carrier (2) and the layer containing the fluorescent substance (16) a fluid-tight barrier layer is formed.

26. Cap according to one of claims 1 to 25, characterized in that the end face (7 ') of the connector (7) consists of a transparent material (7'') up to which the light inlet and outlet opening (s) of / the optical fiber (s) is / are guided.

27. Cap according to one of claims 1 to 26, characterized in that the carrier (2) is designed as a plane-parallel plate.

28. Cap according to one of claims 1 to 26, characterized in that at least one projection (2 ') projecting from the cap (1) is formed on the carrier (2) or on the end face of the cap (1), at least on the surface thereof a layer (16) containing the fluorescent substance or a coated element is applied.

29. Cap according to one of claims 1 to 28, characterized in that in the carrier (2), in

Approach (2 ') or between two adjacent approaches (2') an optical separating layer (14) is arranged.

30. Cap according to one of claims 1 to 27, characterized in that a cuvette (15) with at least one inflow and outflow is arranged on the end face of the cap (1) and the layer (16) containing the fluorescent substance a part the inner wall of the

Cell (15) forms or is applied to the inner wall.

31. Cap according to one of claims 1 to 30, characterized in that in the cap material

Particles of increased thermal conductivity are included.

2. Cap according to one of claims 1 to 31, characterized in that a cover with a light-absorbing surface or made of such a material is arranged at least above the layer (16) containing the fluorescent substance at a distance from the layer (16).