Components for measuring relative humidity levels inside watch cases

Abstract

The invention relates to a component (1) for measuring the relative humidity level inside a watch (2), comprising: the watch (2); and a device (4) for determining the humidity level present in an enclosure (9) of a housing (3) of the watch (2), the determination device (4) comprising a free-space optical system and a control unit (7), the system comprising: a transmitter module (5) for emitting at least one light beam (8); a receiver module (6) for receiving the at least one light beam (8); the control unit (7) being connected to the modules (5, 6), and the at least one light beam (8) emitted by the transmitter module (5) defining an optical path partially included in the housing (3) and extending as far as the receiver module (6), and the control unit (7) being configured to evaluate the absorption of the light beam (8) by water vapor that may be present inside the enclosure (9) of the housing (3).

Description

Technical Field

[0001] The invention relates to an assembly for measuring the relative humidity level inside a watch case. Background Art

[0002] The water resistance of a watch is measured in bar (bar is a unit of pressure where 1 bar is equal to 1 atmosphere (atm)). The water resistance of a watch is generally indicated in metres (m). A watch described as water resistant is intended for ordinary everyday use where water resistance must be guaranteed (e.g. during activities such as swimming or simply in the shower). So-called diving watches must meet stricter standards and, according to current standards, guarantee water resistance up to a minimum depth of 100m.

[0003] To ensure water resistance, watches are usually equipped with a collection of watertight seals located in assembly points of specific parts of the watch, such as the watch glass, bezel and back, and moving parts, such as the crown and buttons. Over time and with use, the mechanical properties of the seals change and the water resistance of the watch may sometimes deteriorate. This makes the watch more permeable to water or water vapor. This may cause condensation on the inner face of the watch glass, or worse, oxidation of specific metal parts or degradation of specific polymer parts. There is therefore a need to be able to monitor the relative humidity level inside the watch from time to time without having to open it, because opening the watch case would require systematic replacement of seals and intervention by the watchmaker, which is expensive. Excessive water vapor inside the watch may indicate the need to replace one or more seals in the short or medium term.

[0004] In order to meet this need, some watches are known to include a device for measuring the relative humidity level inside the watch. Such a measuring device takes the form of an electronic module that can measure and record the values ​​of various environmental parameters (including relative humidity). Due to the small size of such an electronic module, it can be arranged inside the watch housing and can measure the relative humidity level inside the watch housing via a dedicated sensor. The measured relative humidity value can then be transmitted to the watch docking station wirelessly, typically by infrared or radio frequency. The signal emitted by the electronic module as, for example, an infrared signal therefore passes through a transparent part of the watch housing (typically, a watch mirror) and is received by the infrared sensor of the docking station. The user of the watch can then view the measured relative humidity value using a computer connected to the docking station and having dedicated software installed, or using a smart phone.

[0005] However, a disadvantage of such electronic measuring devices is that they require batteries or small batteries to power the various electronic components. Such devices are therefore relatively unsuitable in particular for mechanical watches. Moreover, for electronic watches, they may reduce the autonomy of the product or require the use of larger capacity batteries and thus increase the size of the watch.

[0006] Another disadvantage is that such a device is relatively bulky and is not very discreet inside the watch. Furthermore, such an electronic measuring device is relatively expensive and therefore has an impact on the manufacturing costs of the watch. Summary of the invention

[0007] The object of the present invention is therefore to provide an assembly for measuring the relative humidity level present inside a watch case, thus making it possible to detect defects in the water resistance of such a case without opening it, by monitoring the relative humidity level inside the case. Such a measuring assembly is cost-effective, easy to use and allows reliable and rapid measurement of the relative humidity level inside a watch case.

[0008] To this end, the invention relates to an assembly for measuring the relative humidity level inside a watch, comprising: said watch; and a device for determining the humidity level present in the enclosure of the case of the watch, the determination device comprising a free-space optical system and a control unit, the free-space optical system comprising:

[0009] - a transmitter module for emitting at least one light beam;

[0010] - a receiver module for receiving said at least one light beam;

[0011] The control unit is connected to the modules, and the at least one light beam emitted by the transmitter module defines an optical path partially included in the housing and extending as far as the receiver module, and the control unit is configured to evaluate absorption of the light beam by water vapor that may be present inside the enclosure of the housing.

[0012] According to other embodiments:

[0013] - the measuring assembly comprises at least one reflecting element arranged inside said enclosure of the housing and / or outside this enclosure reflecting said at least one light beam;

[0014] - the at least one reflective element - in particular a dial of the housing - is capable of reflecting the light beam towards the receiver module;

[0015] - the measuring assembly comprises an optical cavity formed by two reflecting elements arranged facing each other inside the enclosure of the housing;

[0016] - the reflective element has a reflectivity at the wavelength of the at least one light beam;

[0017] - a first reflective element is defined on a portion of the inner face of the crystal of the housing and is arranged facing a second reflective element arranged on a portion of the dial;

[0018] - The transmitter module is capable of transmitting simultaneously or sequentially multiple light beams at wavelengths with different absorption coefficients in water vapor;

[0019] - the transmitter module and the receiver module are arranged to face the surface mirror of the housing;

[0020] - when the receiver module is arranged to face the back of the housing, the transmitter module is deployed to face the mirror of said housing;

[0021] - when the receiver module is arranged to face the mirror of the housing, the transmitter module is deployed to face the back of said housing;

[0022] - the housing comprises a crystal, a dial, a movement and / or a back, comprising at least one channel through which said at least one light beam passes;

[0023] - the determination device is configured such that the at least one light beam travels between the transmitter module and the receiver module without being directed so as to be confined in a space different from a first space in which the housing is arranged and / or from a second space defined in an enclosed interior of the housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The objects, advantages and characteristics of this assembly for measuring the relative humidity level inside a watch will appear more clearly in the following description given on the basis of at least one non-limiting embodiment illustrated by way of the accompanying drawings, in which:

[0025] - Figure 1 is a diagrammatic view of an assembly for measuring relative humidity levels according to one embodiment of the present invention;

[0026] - Figure 2 is a diagrammatic view of a first alternative of an assembly for measuring relative humidity levels configured to perform measurements by reflection according to an embodiment of the present invention;

[0027] - Figure 3 is a diagrammatic view of a second alternative of the measuring assembly comprising a device for determining a humidity level configured to perform measurements by transmission according to an embodiment of the invention;

[0028] - Figure 4is a diagrammatic view of a third alternative of the measurement assembly configured to perform measurements by transmission and reflection according to an embodiment of the present invention; and

[0029] - Figure 5 is a diagrammatic view of a fourth alternative of the measurement assembly configured to perform measurements by cavity ring-down spectroscopy according to an embodiment of the present invention. DETAILED DESCRIPTION

[0030] Figures 1 to 5 Several alternatives are shown for an assembly 1 for measuring the relative humidity level inside a watch 2. "Relative humidity level" is here understood to mean the ratio between the partial pressure of the water vapor contained in the air and the saturation vapor pressure at the same temperature. In other words, the measurement of the relative humidity level corresponds to the measurement of the ratio of the water vapor content of the air to its maximum water vapor capacity under the same temperature conditions.

[0031] The measuring assembly 1 comprises a watch 2, and in particular a case 3 of the watch 2, and a device 4 for determining the humidity level and capable of emitting a light signal towards the case 3. It should be noted that the watch 2 may be any type of watch 2, such as for example a mechanical watch 2 or an electronic watch 2.

[0032] In this configuration, the determination device 4 comprises an optical system and a control unit 7. The optical system (also called "free space optical system" or "optical system for the propagation of light beams in free space" or "waveguide-free optical system") comprises a set of optical elements that allow the trajectory of light beams or the properties of these beams to be modified. The expression "free space" refers to any spatial medium (such as, for example: air, outer space, vacuum or something similar, etc. ...) used to route optical signals. This is in contrast to a material running medium (such as a waveguide (e.g. optical fiber)). Such a system does not provide for the propagation of light beams in a waveguide array that occurs by continuous coupling. In this system, these beams are susceptible to reflection, refraction, scattering, diffraction or filtering, etc., without the use of waveguides.

[0033] The system comprises a transmitter module 5 for emitting at least one light beam 8 and a receiver module 6 for receiving said at least one light beam 8. In some alternatives described below, the optical system may further comprise at least one reflective element 10, 11, 12a, 12b (also called "reflective optical element" or "reflector"). Such an element 10 to 12b is in particular capable of deflecting said at least one beam 8. Furthermore, it should be noted that such an optical system obviously lacks a waveguide (such as an optical fiber).

[0034] It should be noted that in this device 4 , a control unit 7 is connected to said modules 5 , 6 .

[0035] Furthermore, it should be noted that such a determination device 4 is particularly configured so that the at least one light beam 8 travels between the transmitter module 5 and the receiver module 6, without being guided so as to be confined in a space (or medium) different from the first space in which the housing is arranged and / or the second space defined inside the enclosure of the housing. In other words, such a determination device 4 is particularly configured so that the at least one light beam 8 travels between the transmitter module 5 and the receiver module 6 in (or through) the first space in which the housing is arranged and / or the second space defined inside the enclosure of the housing, without the at least one light beam being guided in such a way as to be confined in a space (or medium) different from the first space and / or the second space.

[0036] It is therefore understood that such a determination device 4 is particularly configured so that the at least one light beam 8 travels between the transmitter module 5 and the receiver module 6 without being constrained in a space (or medium) different from the first space (or medium) in which the housing is arranged and / or the second space defined inside the enclosure of the housing. Advantageously, such a determination device 4 is particularly configured so that the at least one light beam 8 travels between the transmitter module 5 and the receiver module 6 in (or through) the first space in which the housing is arranged and / or the second space defined inside the enclosure of the housing, and the at least one light beam is not constrained in a space (or medium) different from the first space and / or the second space.

[0037] It should be remembered that the space (or medium) is the physical element in which the at least one light beam propagates and with which the at least one light beam interacts. Such interaction causes a change in the properties of the beam. In a non-limiting and non-exhaustive manner, such a space (or medium) can be air, water or glass, etc.

[0038] For example, under these conditions, the at least one light beam 8 travels in the first space and / or the second space instead of in a particular space (or medium) that is specially defined / created, such as the space that can be defined / created in a waveguide such as an optical fiber. It should be remembered that the principle of confinement of a light beam (and more generally, light) is as follows: a dielectric space (or medium) embedded in a second space with a lower refractive index forms a trap for light reflected at the boundary by total internal reflection. Optical fibers, being cylindrical light guides, operate according to this principle.

[0039] It should be noted that the second space is defined inside the enclosure of the housing and that the boundaries of the second space are formed by components of the housing, such as the mirror 15 and / or the dial 17, the back 16 and the middle 14. The movement 18 is also arranged in the second space. It should also be noted that the properties of the second space, in particular the optical properties, can be substantially similar or even strictly similar to those of the first space. In a non-limiting and non-binding manner, these properties can be the refractive index of the space (or medium), its transparency (the term transparency in this case refers to a non-absorbing space (or medium)), its homogeneity (i.e., whether the properties of the space (or medium) are the same in all points that constitute it) and its isotropy (i.e., whether the properties of the space (or medium) are the same in all directions), etc.

[0040] Furthermore, it should be noted that the optical system is arranged in the first space and the second space.

[0041] According to the principles of the invention, such an assembly 1 aims to measure the relative humidity level present inside the envelope 9 of the case 3 of the watch 2, wherein the optical path is partially comprised in this envelope 9, according to the evaluation of at least one modification of at least one property of the light beam 8. In this case, said at least one modification is a function of the water vapor content contained in this envelope 9 of the case 3. In other words, the humidity level is determined according to the evaluation of the absorption of said light beam 8 by the water vapor that may be present in the air contained in the envelope 9 of the case 3. It should be noted that in this case the absorption is measured because, as will be seen below, since the absorption coefficient of the light beam 8 is known, we can deduce the number of molecules present in the air inside this envelope and therefore the density of this air.

[0042] Such a case 3 comprises a middle part 14 which is, for example, annular in shape and which is provided with an upper annular edge on which rests a crystal 15 of the case 3 . Figures 1 to 4 In the case 3 of the watch 2 shown in the example in FIG. 1 , its configuration is substantially circular. However, the present invention is by no means limited to such a configuration of the case 3 of the watch 2. The case 3 further comprises a dial 17 provided with time display means.

[0043] Further and according to an alternative to the measuring assembly 1, the watch 2 - and in particular the case 3 - may comprise components such as a crystal 15, a back 16, a dial 17 and a movement 18, each of which comprises at least one passage through which the at least one light beam 8 passes. Each of these components preferably comprises a first passage and a second passage, the first passage being capable of being passed by the at least one light beam 8 in a first direction and the second passage being capable of being passed by the same reflected light beam 8 but in a second direction which may be opposite to the first direction. In this case 3, the first passage or the second passage are preferably aligned in a coaxial manner. These passages through the dial 17 and through the movement 18 may both be openings / grooves. The passage through the dial 17 may also be a transparent portion of a dial made of glass, for example mineral glass or sapphire glass. The passage through the dial 17 may be defined on all or part of the dial. In the case of the back 16, the passage is preferably a transparent portion of the back which may be made of glass and which may also be defined on all or part of the back 16. The passage through the back 16 may also be made of mineral glass or sapphire glass. Such a configuration may be that of a skeletonized watch 2, in which the interior of the case 3 and its moving parts are visible on the front at the crystal 15 or on the rear through such a back 16. In such a watch 2, the at least one light beam 8 emitted by the determination device 4 can penetrate the envelope 9 of the case 3 through the crystal 15 and exit from the back 16.

[0044] According to another alternative of the measuring assembly 1, the watch 2 - and in particular the housing 3 - may comprise at least one reflective element 10, 11 and / or an optical cavity 13 formed by at least two reflective elements 12a, 12b. These reflective elements 12a, 12b may comprise a coating that is anti-reflective at wavelengths contained in the visible spectrum but reflective at the wavelength of the light beam. The coating may be made of aluminum oxide or titanium dioxide.

[0045] Furthermore, it should be noted that the crystal 15 of the case 3 comprises a passage for said at least one light beam 8 defined on all or part of said crystal 15. Such a passage allows said at least one light beam 8 to enter the envelope 9, preferably without modifying the properties of said beam 8 that are susceptible to variation under the effect of water vapour. This crystal 15 may be a mineral glass or sapphire glass having a thickness of about 5 mm, which allows at least the transmission of said at least one light beam 8 having a wavelength comprised between 0.2 and 4.5 μm.

[0046] In the determination device 4, a transmitter module 5 emitting at least one light beam 8 comprises a focused light source capable of emitting a light beam towards the watch 2 through a watch crystal 15, allowing the beam 8 to enter the envelope 9 of the housing 3. This module is preferably a transmitter module 5 for emitting at least one laser beam. The wavelength of this laser beam is comprised between 2.4 and 3 μm, and is preferably 2.6 μm. Such a module 5 is capable of pulseless operation by including, for example, a continuous wave (CW) laser. In contrast to Q-switched or femtosecond lasers that produce pulsed light, such a laser is capable of generating a continuous output beam. This transmitter module 5 can be configured to implement modulation, in particular a slower modulation with superposition, so as to improve the signal-to-noise ratio by rejecting noise outside the modulation frequency. A slow frequency shift can also be provided.

[0047] The receiver module 6 comprises at least one optical light sensor, and in particular at least one optical sensor for sensing said at least one light beam (in the present embodiment, a laser beam emitted by the transmitter module 5). This optical sensor comprises at least one photodiode. This receiver module 6 is also provided with an analog-to-digital converter for converting an analog variable related to the intensity of said at least one beam 8 into a digital value. It should be noted that when it comprises at least two optical sensors, the receiver module 6 is capable of amplifying the difference between the signals originating from these optical sensors in order to reduce the effect of the relative intensity noise of said at least one laser beam, or in order to optimize the dynamic range of the analog-to-digital converter. Such a receiver module 6 is capable of receiving said light beam 8 travelling inside the enclosure 9 of the housing 3.

[0048] As mentioned above, the determination device 4 further comprises a control unit 7. The control unit 7 may be a computer comprising hardware and software resources, in particular at least one processor cooperating with a memory element. The control unit 7 is capable of executing commands to implement a computer program in order to contribute to the determination of the measurement of the relative humidity level inside the enclosure 9 of the case 3 of the watch 2.

[0049] The control unit 7 is connected to the transmitter module 5 and to the receiver module 6. Such a control unit 7 is capable of controlling these modules 5, 6 so as to participate in the measurement of the relative humidity level inside the enclosure 9 of the housing 3. In particular, the control unit 7 is capable of performing signal processing operations by signal modulation and synchronous detection operations. The control unit 7 is configured to evaluate the absorption of said light beam 8 by water vapor that may be present inside said enclosure 9 of the housing 3. Such a control unit 7 comprises, for example, in its memory element one or more look-up tables for matching the value of the intensity of the light beam 8 and / or the absorption coefficient of said light beam 8 by water vapor to a value of the relative humidity level associated with the value of the intensity of the beam and / or with the absorption coefficient so as to participate in the evaluation of the humidity level inside the housing 3.

[0050] exist Figure 2In a first alternative of the measuring assembly 1 shown in FIG. 1 , the assembly is configured to perform a measurement of the humidity level according to the principle of reflection of the at least one light beam 8 inside the enclosure 9 of the housing 3. In this alternative, the transmitter module 5 and the reflector module 6 are arranged facing the mirror 15. In this case, the housing 3 thus comprises a mirror 15 having a passage therein for the passage of the at least one light beam 8 towards the enclosure 9 of the housing 3 and a reflective element 10. Such a reflective element 10 may be included in all or part of the dial 17 of the watch 2. Thus, the at least one light beam 8 will follow an optical path starting from the transmitter module 5, then penetrating the enclosure 9 through the passage in the mirror 15 to finally be reflected by the dial 17 towards the receiver module 6.

[0051] exist Figure 3 In a second alternative of the measurement assembly 1 shown in FIG. 1 , the assembly 1 is configured to perform a measurement of the humidity level according to the principle of transmission of said at least one light beam 8 through the enclosure 9 of the housing 3. In this alternative, the transmitter module 5 is arranged facing the crystal 15 and the receiver module 6 facing the back 16, or the transmitter module 5 is arranged facing the back 16 and the receiver module 6 facing the crystal 15. In this case, the housing 3 thus comprises the crystal 15, the movement 18, the dial 17 and the back 16, each of which has a corresponding passage therein for said at least one light beam 8, which thus passes through this enclosure 9 of the housing 3. It should be noted that in such a configuration, the watch 2 may be a skeletonized watch 2. Thus, said at least one light beam 8 will follow an optical path starting from the transmitter module 5, then penetrating the enclosure 9 through the passage in the crystal 15 to finally exit this enclosure 9 via the passage through the back 16 towards the receiver module 6.

[0052] exist Figure 4 In a third alternative of the measuring assembly 1 shown in , the assembly 1 is configured to perform the measurement of the humidity level according to the principle of transmission and reflection of the at least one light beam 8 through the enclosure 9 of the housing 3. In this alternative, the transmitter module and the reflector module are arranged facing the mirror 15 or the back 16. In this case, the housing 3 comprises a reflective element 11 arranged outside the housing 3 and facing the back 16, and further comprises a mirror 15, a movement 18, a dial 17 and a back 16, each of which is provided with two channels:

[0053] - a first channel in each of them, provided for the transmission of said at least one light beam 8 through the housing 3, and

[0054] - a second channel in each of them, provided for reflection of the at least one transmitted light beam 8 passing again through the housing 3 .

[0055] In this third alternative, said at least one light beam 8 will thus follow an optical path starting from the transmitter module 5 and penetrating the envelope 9 by passing through a first passage in the crystal 15, in the dial 17 and in the movement 18, so as to finally exit this envelope 9 through a first passage in the back 16 and then be reflected on the reflective element 11 towards the receiver module 6 by passing through the envelope 9 again via a second passage in the back 16, in the movement 18, in the dial 17 and in the crystal 15. It should be noted that in this case, the watch 2 may be a skeletonized watch 2.

[0056] exist Figure 4 In a fourth alternative of the measurement assembly 1 shown in FIG. 1 , the assembly 1 is configured to perform measurements by cavity ring-down spectroscopy 13 of said at least one light beam 8 inside the enclosure 9 of the housing 3 . This fourth alternative implements a spectroscopy technique that allows increasing the optical path in the enclosure 9 of the watch 2 , which results in increasing the absorption of said light beam 8 by water vapor and thus improving the sensitivity of the measurement. In this alternative, the transmitter module 5 and the reflector module 6 are arranged facing the crystal 15 . In this case, the housing 3 thus comprises an optical cavity 13 comprising at least two reflecting elements 12a, 12b having a reflectivity at the wavelength of said at least one light beam. A first element is defined on a portion of the internal face of the crystal 15 and is arranged facing a second reflecting element 12a, 12b arranged on a portion of the dial 17 . In this configuration, the optical properties of this optical cavity 13 vary as a function of the humidity level present inside the enclosure 9 of the housing 3 . More specifically, within the scope of establishing a measurement of the relative humidity level, the decay time of the reflectivity of said at least one light beam 8 in the cavity 13 after its emission by the transmitter module 5 has ceased is taken into account in this alternative. In this alternative, the housing 3 further comprises a mirror 15 equipped with two channels:

[0057] - a first channel provided for the transmission of said at least one light beam 8 towards an optical cavity 13 comprised in the envelope 9 of the housing 3, and

[0058] - a second channel provided for reflection of the at least one light beam 8 emerging from the optical cavity 13 .

[0059] Such first and second channels may be semi-transparent for the visible spectrum, and / or semi-reflective for infrared light, and / or have a reflectivity of less than 1.

[0060] In this fourth alternative, the at least one light beam 8 will therefore follow an optical path starting from the transmitter module 5 and penetrating the optical cavity 13 by passing through a first channel in the mirror 15 to finally exit the optical cavity 13 via a second channel through the mirror 15 towards the receiver module 6 .

[0061] It should be noted that as the length of the portion of the optical path comprised in the envelope 9 of the housing 3 increases, the measurement of the humidity level performed by the measuring assembly 1 increases in accuracy.

[0062] In the determination device 4, the transmitter module 5 is capable of emitting simultaneously or successively a plurality of light beams at wavelengths having different absorption coefficients in water vapor. For example, the wavelengths of these beams may be approximately 2.3 and 2.6 μm.

[0063] Furthermore, the determination device 4 may be a portable or mobile device (ie, a device 4 that can be carried by a user without requiring a wired connection for its power source).

[0064] On the other hand, the determination device 4 may comprise a display element capable of displaying a plurality of different visual signals depending on the value of the relative humidity level determined by the control unit 7. Each visual signal displayed by the display element thus corresponds to a predetermined relative humidity level value or a predetermined relative humidity difference value, depending on the case. The display element may be a screen provided with light emitting diodes, or may more simply correspond to a light indicator with light emitting diodes, the illumination of a given diode corresponding to a predetermined relative humidity threshold value.

Claims

1. An assembly (1) for measuring the relative humidity level inside a watch (2), comprising: The watch (2); and a device (4) for determining the humidity level present in the enclosure (9) of the case (3) of the watch (2), the determining device (4) comprising an optical system for routing optical signals at least via air and a control unit (7), the system comprising: - a transmitter module (5) for emitting at least one light beam (8) as an optical signal; - a receiver module (6) for receiving said at least one light beam (8); The control unit (7) is connected to the modules (5, 6), and the at least one light beam (8) emitted by the transmitter module (5) defines an optical path partially comprised in the housing (3) and extending as far as the receiver module (6), and the control unit (7) is configured to evaluate the absorption of the light beam (8) by water vapor that can be present inside the envelope (9) of the housing (3), The housing (3) comprises a crystal (15), a dial (17), a movement (18) and / or a back (16), and each of the crystal (15), the dial (17), the movement (18) and / or the back (16) comprises at least one channel through which the at least one light beam (8) passes, and the at least one light beam (8) passes through the at least one channel in the crystal (15), the dial (17), the movement (18) and / or the back (16) to penetrate the enclosure (9).

2. The measuring assembly (1) according to claim 1, characterized in that It comprises at least one reflecting element (10, 11) arranged inside the enclosure (9) of the housing (3) and / or outside the enclosure (9) for reflecting the at least one light beam (8).

3. The measuring assembly (1) according to claim 2, characterized in that The at least one reflective element (10, 11) comprises a dial (17) of the housing (3) capable of reflecting the light beam (8) towards the receiver module (5).

4. The measuring assembly (1) according to any one of claims 1 to 2, characterized in that It comprises an optical cavity (13) formed by two reflective elements (12a, 12b) arranged facing each other inside an envelope (9) of a housing (3).

5. The measuring assembly (1) according to claim 4, characterized in that The reflective element (12a, 12b) has a reflectivity at the wavelength of the at least one light beam (8).

6. The measuring assembly (1) according to claim 5, characterized in that The first reflective element (12a) is defined on a portion of the inner face of the crystal (15) of the housing (3), and is disposed to face the second reflective element (12a) disposed on a portion of the dial (17).

7. The measuring assembly (1) according to any one of claims 1 to 3, characterized in that The transmitter module (5) is capable of simultaneously or sequentially transmitting a plurality of light beams at wavelengths having different absorption coefficients in water vapor.

8. The measuring assembly (1) according to any one of claims 1 to 3, characterized in that The transmitter module (5) and the receiver module (6) are disposed to face the surface mirror (15) of the housing (3).

9. The measuring assembly (1) according to any one of claims 1 to 3, characterized in that: - when the receiver module (6) is arranged to face the back (16) of the housing (3), the transmitter module (5) is arranged to face the mirror (15) of the housing (3), or - When the receiver module (6) is arranged to face the mirror (15) of the housing (3), the transmitter module (5) is deployed to face the back (16) of the housing (3).

10. The measuring assembly (1) according to any one of claims 1 to 3, characterized in that The determination device (4) is configured to enable the at least one light beam (8) to travel between the transmitter module (5) and the receiver module (6) without being guided and thereby confined in a space different from a first space in which the housing is arranged and / or a second space defined within the enclosure of the housing.

Images