A diode voltage from a diode circuit can be combined with a proportional to absolute temperature (PTAT) voltage generated by a PTAT circuit to determine a temperature sensor voltage. This temperature sensor voltage may correspond to a temperature of a circuit or a localized temperature. By determining the temperature sensor voltage using a combination of a PTAT voltage and diode voltage, it is possible to remove or a PTAT circuit used to generate a bandgap voltage, which may shrink the temperature sensor and increase the accuracy of the temperature sensor circuit.

An apparatus for determining and/or monitoring a process variable, for example, temperature, flow or flow velocity, of a medium in a containment includes a temperature sensor for registering temperature securable to an outer surface of the wall of the containment, at least one connection line for electrical contacting of the temperature sensor, and securement means for a releasable securing of the temperature sensor and a temperature sensor-near section of the connection line to the outer surface of the wall of the containment. According to the present disclosure, at least the section of the connection line is securable to the outer surface of the wall of the containment such that the section extends parallel with the wall of the and is in thermal contact with the wall of the containment.

The present disclosure relates to a device for determining and/or monitoring temperature of a liquid, comprising a temperature sensor, a reference element for in-situ calibration and/or validation of a temperature sensor and an electronics unit, wherein the reference element is composed at least partially of a material, in the case of which at least one phase transformation occurs at at least a first predetermined phase transformation temperature in a temperature range relevant for calibrating the temperature sensor, in which phase transformation the material remains in the solid phase. According to the present disclosure, the electronics unit is embodied to supply the reference element with a dynamic excitation signal. Furthermore, the present disclosure relates to a method for calibration and/or validation of a temperature sensor based on a device of the invention.

Embodiments of a device and method are disclosed. In an embodiment, a calibration circuit for a temperature sensor circuit includes a current source configured to generate a temperature independent reference current and further includes a voltage window generator circuit. The voltage window generator circuit is configured to generate a voltage window for the temperature sensor circuit using at least the temperature independent reference current. The voltage window is defined by a first reference voltage and a second reference voltage. The voltage window generator circuit is further configured to control a width of the voltage window to include a range of proportional to absolute temperature (PTAT) voltage outputs of a temperature sensor in the temperature sensor circuit.

A method of determining a turbine inlet temperature for a gas turbine engine includes measuring pressure changes within a combustion section of the gas turbine engine during operation of the gas turbine engine to produce pressure versus time data, extracting a resonant frequency from the pressure versus time data, and calculating the turbine inlet temperature based solely on the resonant frequency.

Temperature-sensor calibrating method enables reusing the thermometer main unit of a wearable clinical thermometer. The temperature sensors are designed to be detachable from/reattachable into the thermometer main unit, and have an associated information-recording medium. The method calibrates the temperature sensor whenever a temperature sensor is substituted in, enabling the temperature sensor alone to be made disposable. The temperature-sensor calibrating method includes acquiring base resistance values having been sampled on a per-temperature-sensor basis inside a constant-temperature tank; computing for the temperature sensor, based on the difference between the base resistance values and resistance values derived, utilizing the B constant, from actual temperatures gauged with a standard temperature gauge inside the constant-temperature tank during the sampling, a value designating a calibration coefficient; recording in the information-recording medium the value designating a calibration coefficient; and causing a terminal to read in the value designating a calibration coefficient from the information-recording medium.

A method for accurately measuring a battery temperature using a temperature sensor embodied in a battery monitoring integrated circuit is disclosed. The method includes performing calibration to estimate a thermal resistance between the battery monitoring integrated circuit and a terminal of a battery, measuring a temperature using the temperature sensor, measuring a voltage at the terminal or at a supply pin of the battery monitoring integrated circuit while a current is being used to charge or discharge the battery, calculating a power by multiplying the voltage and the current, and calculating a self-heating temperature adjustment to the temperature by multiplying the power and the thermal resistance.

A thermal sensor with non-ideal coefficient elimination is shown. The thermal sensor has a bandgap circuit, a dual-phase voltage-to-frequency converter, and a frequency meter. The bandgap circuit outputs a temperature-dependent voltage. The dual-phase voltage-to-frequency converter is coupled to the bandgap circuit in the normal phase to perform a voltage-to-frequency conversion based on the temperature-dependent voltage, and is disconnected from the bandgap circuit in the coefficient capturing phase to perform the voltage-to-frequency conversion based on the supply voltage. The frequency meter is coupled to the dual-phase voltage-to-frequency converter to calculate the temperature-dependent frequency corresponding to the normal phase of the dual-phase voltage-to-frequency converter. The frequency meter also calculates the temperature-independent frequency corresponding to the coefficient capturing phase of the dual-phase voltage-to-frequency converter. The temperature-dependent frequency and the temperature-independent frequency are provided for temperature evaluation with non-ideal coefficient elimination.

Self-calibrating a humidity sensor of an integrated humidity and temperature sensor, using the integrated heating element, and the temperature and humidity sensors, of the device, together with a firmware-based control loop running on a controller. The controller actively calculates and monitors one or both sensor output, and the slopes of the sensor outputs, in real time, while the heating element is on, and compares one or both slopes to a pre-programmed threshold, while in a programmable control loop, to then capture the appropriate relative humidity offset to apply to the device during normal operation (with the integrated heating element switched off) for correcting the relative humidity output from the device. Any singularly mounted in-system device can be calibrated, independent of external references, for in-system calibration.

A thermal sensor in some embodiments comprises two temperature-sensitive branches, each including a thermal-sensing device, such as one or more bipolar-junction transistors, and a current source for generating a current density in the thermal-sensing device to generate a temperature-dependent signal. The thermal sensor further includes a signal processor configured to multiply the temperature-dependent signal from the branches by respective and different gain factors, and combine the resultant signals to generate an output signal that is substantially proportional to the absolute temperature the thermal sensor is disposed at.