Abstract: The invention relates to a method for determining the temporal position of a wave packet (31) in a flow measuring apparatus, and to a flow measuring apparatus. The method includes the sampling of the wave packet at a plurality of points in time, wherein a measured value is created at each point in time. Subsequently, a sum of products (43, 54, 55, 63, 64) is calculated, wherein each product is calculated for a determined point in time from a plurality of points in time and each product is the product of a value of a compare function (44, 53, 56, 61, 62) at the determined point in time and the measured value at the determined point in time. Finally, the temporal position of the wave packet is calculated from the sum of products.

Abstract: The invention relates to a method for determining the temporal position of a wave packet (31) in a flow measuring apparatus, and to a flow measuring apparatus. The method comprises the sampling of the wave packet at a plurality of points in time, wherein a measured value is created at each point in time. Subsequently, a sum of products (43, 54, 55, 63, 64) is calculated, wherein each product is calculated for a determined point in time from a plurality of points in time and each product is the product of a value of a compare function (44, 53, 56, 61, 62) at said determined point in time and the measured value at said determined point in time. Finally, the temporal position of the wave packet is calculated from the sum of products.

Abstract: This invention relates to a pulse sensor, comprising a radiation source (21, 22; 61, 62; 81, 82; 131, 132, 141, 142; 151, 152) for emitting photons and a photodetector (23; 63; 83; 133; 143; 153) for detecting the photons. The pulse sensor further comprises a holder (2, 3, 4; 53, 54; 130; 150) for fixing the radiation source and the photodetector to a person. Moreover, the pulse sensor comprises a connection (55; 165) to a pulse meter, wherein the pulse meter controls the radiation source (21, 22; 61, 62; 81, 82; 131, 132, 141, 142; 151, 152) and reads out the photodetector (23; 63; 83; 133; 143; 153) via the connection (55; 165). The pulse sensor finally comprises an stimulus generator (15, 16, 24, 41, 43, 44, 45; 52, 64; 75, 76, 84, 85; 134, 135, 144, 145; 156) attracting the attention of the person when the stimulus generator is activated by the pulse meter because the pulse of the person is outside a permitted range (107). Also, this invention relates to oximeters, joysticks and helmets.

Abstract: The present invention relates to a gas reservoir bag (6), comprising a flexible bag (9) for separating two different gases with a connection. The gas reservoir bag further comprises an outer bag (8) for generating a pressure difference between the flexible bag (9) and the ambiance of the outer bag (8), wherein the outer bag (8) surrounds the flexible bag (9) except for the connection thereof. The invention moreover relates to a distributor housing for a respiratory mask having such a gas reservoir bag and to a respiratory mask having such a distributor housing. The invention finally relates to corresponding methods.

Abstract: The invention refers to a device for the detection of changes in the density of a solid, liquid or gaseous medium. The device is capable of detecting the effects of physical and/or chemical parameters, causing changes in the density and/or compression constants of the medium. The device comprises a transmitter unit for transmitting a send signal, having a constant frequency and amplitude and the send signal, comprising a minimum of one period, with a minimum of one receiver unit receiving the response signals reflected and/or transmitted from the medium. The transmitter and receiver units are coupled to the medium. The receiver unit is coupled to an A/D converter and a sampling device. The transmitter unit and the output of the A/D converter are coupled to a numerical processor for determination of the phase shift between the send signal and the receive signal, with the output being connected to a display. A memory may be used instead of a display.

Abstract: The invention relates to a device for determining the change in the density of a solid, liquid or gaseous medium. Said device is able to detect effects on the density of the medium caused by physical and/or chemical parameters which cause changes in the density of the medium. The device comprises an emission device (2) for emitting any kind of emission signal having at least one period. Said emission device is coupled to the medium (3). At least one receiving device (7) picks up the response signals which are reflected and/or transmitted from the medium. A comparator (6) follows each receiving device, the receiving device being connected across one input of the comparator and the emission device being respectively connected across the other input thereof. The outputs of the comparators are coupled to a processing and sample selecting device which is followed by a display screen (9).