In accordance with an embodiment, a device includes an interface configured for obtaining at least one measurement signal from a temperature sensor. In a first time interval the at least one measurement signal comprises information about a temperature-dependent voltage difference between a first temperature-dependent voltage at a first diode of the temperature sensor and a second temperature-dependent voltage at a second diode of the temperature sensor. In a second time interval the at least one measurement signal comprises information about a measurement value of a temperature-dependent voltage at a temperature-dependent electrical component of the temperature sensor.

In accordance with an embodiment, a device includes an interface configured for obtaining at least one measurement signal from a temperature sensor. In a first time interval the at least one measurement signal comprises information about a temperature-dependent voltage difference between a first temperature-dependent voltage at a first diode of the temperature sensor and a second temperature-dependent voltage at a second diode of the temperature sensor. In a second time interval the at least one measurement signal comprises information about a measurement value of a temperature-dependent voltage at a temperature-dependent electrical component of the temperature sensor.

In an example, this document discloses an apparatus for insertion into a body lumen, the apparatus comprising an optical fiber pressure sensor. The optical fiber pressure sensor comprises an optical fiber configured to transmit an optical sensing signal, a temperature compensated Fiber Bragg Grating (FBG) interferometer in optical communication with the optical fiber, the FBG interferometer configured to receive a pressure and modulate, in response to the received pressure, the optical sensing signal, and a sensor membrane in physical communication with the FBG interferometer, the membrane configured to transmit the received pressure to the FBG interferometer.

An optical refraction barometer measures pressure based on refractivity changes and includes: an optical light source; an optical frequency controller; a first optical phase controller; a first polarization controller; an electronic reference arm in optical communication with the first polarization controller; a second optical phase controller in optical communication with the optical frequency controller; a second polarization controller in optical communication with the second optical phase controller; an electronic sample arm in optical communication with the second polarization controller and in electrical communication with the second optical phase controller; a second sideband frequency generator; a mixer in electrical communication with the detector and the second sideband frequency generator; and a first sideband frequency generator in electrical communication with the mixer; and a dual fixed length optical cavity refractometer.

The present invention concerns apparatus (1) for obtaining distributed pressure measurements in a wellbore (2), the apparatus (1) comprising: a flexible rod (10; 110) arranged to be disposed in the wellbore (2); and an elongate sensing member (15; 115) extending along the rod, the sensing member comprising at least one optical sensing fibre member (16; 116) arranged to afford a continuous length of sensing capability, wherein the sensing member extends in a groove formed in the exterior surface of the rod.

A method of collecting measurements for estimating one or more air data parameters of an aerospace vehicle is disclosed. The method includes converting, by an array of optical sensors, incident light into an optical signal indicating a measurement for estimating the one or more air data parameters. The array of optical sensors is disposed along a skin of the aerospace vehicle. The method includes measuring, by an interrogator, a wavelength of a combined optical signal, wherein the combined optical signal is a combination of the optical signals generated by each of the optical sensors that are part of the array. The method further includes converting, by the interrogator, the wavelength of the optical signal into an electronic signal indicating either the measurement for estimating the one or more air data parameters. Finally, the method includes sending the electronic signal indicating the measurement to a platform network.

A pressure sensor and a pressure detecting method are provided, the pressure sensor includes a liquid crystal cell including a cholesteric liquid crystal layer, a liquid crystal state detector module and a pressure finder module, and the liquid crystal cell includes a pressure receiving surface. The liquid crystal state detector module is configured to detect a liquid crystal arrangement state in the cholesteric liquid crystal layer in a situation where a pressure is applied on the pressure receiving surface of the liquid crystal cell; the pressure finder module is configured to find a value of the pressure corresponding to the liquid crystal arrangement state from a pre-stored correspondence table.

A pressure sensor and a pressure detecting method are provided, the pressure sensor includes a liquid crystal cell including a cholesteric liquid crystal layer, a liquid crystal state detector module and a pressure finder module, and the liquid crystal cell includes a pressure receiving surface. The liquid crystal state detector module is configured to detect a liquid crystal arrangement state in the cholesteric liquid crystal layer in a situation where a pressure is applied on the pressure receiving surface of the liquid crystal cell; the pressure finder module is configured to find a value of the pressure corresponding to the liquid crystal arrangement state from a pre-stored correspondence table.

Various embodiments of the teachings herein include a pulse counter for fluid pressure changes. The pulse counter may include: a first and a second housing part with a fluid passage; a circuit board at least partially enclosed within the housing, the circuit board comprising a light pulse transmitter and a light pulse receiver; a battery at least partially within the housing, the battery supplying electric power to the light pulse transmitter and the light pulse receiver; a rod slidably arranged within the housing, with one end of the rod within the fluid passage, and a second end arranged at least partly breaking a light pulse between the light pulse transmitter and the light pulse receiver; and a spring forcing the rod away from the light pulse and towards the fluid passage.

Various embodiments of the teachings herein include a pulse counter for fluid pressure changes. The pulse counter may include: a first and a second housing part with a fluid passage; a circuit board at least partially enclosed within the housing, the circuit board comprising a light pulse transmitter and a light pulse receiver; a battery at least partially within the housing, the battery supplying electric power to the light pulse transmitter and the light pulse receiver; a rod slidably arranged within the housing, with one end of the rod within the fluid passage, and a second end arranged at least partly breaking a light pulse between the light pulse transmitter and the light pulse receiver; and a spring forcing the rod away from the light pulse and towards the fluid passage.