Abstract:
A combined pressure and temperature sensor, the sensor comprising at least one first optical sensing element of a first type and at least one second optical sensing element of a second type, wherein the sensor is adapted to compensate for temperature and/or pressure effects in the first or second optical sensing element using a response of the other of the second or first optical sensing elements.
Abstract:
Die Erfindung bezieht sich auf ein Verfahren zur druckunabhängigen Temperaturbestimmung mittels einer Metallmembran (1). An dieser ist eine Brückenschaltung (5) mit mehreren Widerständen (6, 7, 8, 9) aufgenommen. Ein Widerstandspaar (10) der Widerstände (6, 7, 8, 9) ist zentrumsnah, ein anderes Widerstandspaar (11) der Widerstände (6, 7, 8, 9) ist zentrumsfern angeordnet. Die Widerstände (6, 7, 8, 9) werden auf der Metallmembran so angeordnet, dass die Zugdehnung (Δ1) des zentrumsnahen Widerstandspaares (10) der Widerstände (6, 7, 8, 9) bestragsmässig den Stauchungen -Δ1 des zentrumsfernen Widerstandspaares (11) der Widerstände (6, 7, 8, 9) entsprechen.
Abstract:
A strain compensated temperature sensor includes a first, temperature dependent resistor, and a second, substantially temperature independent resistor connected in series with the temperature dependent resistor. At least one electrical contact allows an electrical potential difference to be applied across both resistors simultaneously. Both the temperature dependent resistor and the substantially temperature independent resistor are sensitive to mechanical strain. This permits temperature readings from the sensor to be corrected automatically for mechanical distortion of the sensor. The temperature dependent resistor and the substantially temperature independent resistor are of substantially similar construction, preferably being located adjacent one another in or on a common substrate, and hence have a similar response to a mechanical force applied to them.
Abstract:
The invention relates to a device for determining the pressure and temperature in the suction pipe of an internal combustion engine with a temperature sensor (50) and pressure sensor (30) positioned in a common housing (10), said pressure sensor being fixed on a support (20), together with an evaluating circuit, with as few distortions possible. The aim of the invention is to improve the device in such a way that it is easy to produce and enables temperature to be measured precisely and especially pressure to be measured very precisely. To this end, it is suggested that a connection piece (40) attached to the housing (10) is provided for delivering a medium under pressure, as well as an intermediary piece (60) which is connected to both the support (20) and said connection piece (40) via seal bonds (61), said seal bonds neutralising mechanical distortions.
Abstract:
A thin film sensor element (4) comprising a diaphragm (6), a first thin film electrically insulating layer (7), a thin film constraining layer (8), and a thin film sensor layer (10), said sensor layer comprising one or more sensing components, forming a layered thin film structure, where the diaphragm (6) serves as a substrate for the thin film layers (7, 8, 10). The first electrically insulating layer (7) is arranged between the diaphragm (6) and the constraining layer (8), and the constraining layer (8) is arranged between the first electrically insulating layer (7) and the sensing components (10). The first electrically insulating layer (7) is made from a material which has a Young's modulus which is significantly lower than a Young's modulus of the material of the diaphragm (6), and which is significantly lower than a Young's modulus of the material of the constraining layer (8). Thereby relaxation of strain in the first electrically insulating layer (7) is constrained, and signal drift of the sensor element (4) is minimised.
Abstract:
A combined pressure and temperature sensor, the sensor comprising at least one first optical sensing element of a first type and at least one second optical sensing element of a second type, wherein the sensor is adapted to compensate for temperature and/or pressure effects in the first or second optical sensing element using a response of the other of the second or first optical sensing elements.