An on-chip temperature sensor for generating a digital output signal representing a temperature value includes: a proportional to absolute temperature (PTAT) buffer for alternately generating a first voltage signal representing a first temperature of the PTAT buffer and a second voltage signal representing a second temperature of the PTAT buffer; an analog to digital (A/D) converter, coupled to the PTAT buffer, for converting the first voltage signal to a first digital voltage signal and for converting the second voltage signal to a second digital voltage signal; and a digital output generating block, for receiving the first digital voltage signal and the second digital voltage signal, and comparing a difference between the first digital voltage signal and the second digital voltage signal with a digital voltage reference signal to generate the digital output signal.

An exemplary embodiment of the present invention provides systems and methods of compensating sensor drift. In one example embodiment, a system may comprise a primary sensor having a primary full-scale range and configured to output a primary environmental condition signal indicative of an environmental condition; a reference sensor having a reference full-scale range and configured to output a reference environmental condition signal indicative of the environmental condition, wherein the reference full-scale range is less than the primary full-scale range; and a drift compensation system configured to determine a drift compensation signal using the primary environmental signal and the reference environmental condition signal responsive to the reference environmental conditional signal being in the reference full-scale range and compensate the primary environmental condition signal using the drift compensation signal.

There is described an apparatus for testing whether a fiber optic monitoring system is functioning properly. The apparatus includes an enclosure comprising one or more apertures for receiving therethrough optical fiber; and one or more actuators sealed within the enclosure for generating one or more interference signals for interfering with optical fiber within the enclosure such that an optical path length of the optical fiber is altered. There is also described a method for verifying an event detection system, comprising: interrogating optical fiber positioned alongside a conduit by sending one or more light pulses along the optical fiber and receiving reflections of the one or more light pulses; and using a event verification device housed within an enclosure through which passes the optical fiber to generate one or more interference signals for interfering with the optical fiber such that an optical path length of the optical fiber is altered.

Representative implementations of devices and techniques provide calibration for a chip-based temperature sensor. Two or more measurements are taken using a high resolution temperature sensor digitizer, and used to determine a calibration for the temperature sensor, based on a reference temperature value calculated from the measurements.

A first temperature sensor measures a first temperature of an object related to an engine. A fuel temperature sensor measures a fuel temperature. A diagnostic apparatus includes a diagnostic unit diagnosing the first temperature sensor based at least in part on the first temperature measured at the first temperature sensor. The diagnostic apparatus also includes a first determining unit determining whether the state of fault of the first temperature sensor is unclear or not based at least in part on the variation in the fuel temperature after the start-up of the engine for the diagnosis at the diagnostic unit.

Disclosed is a temperature sensor including a first current generator configured to generate a proportional to absolute temperature (PTAT) current, a second current generator configured to generate an inverse PTAT (IPTAT) current, the PTAT current and IPTAT current being combined to form a reference current having a sensitivity relative to temperature, a plurality of current mirrors to adjust the sensitivity and gain of the reference current, and a variable resistor to set an output calibration voltage based on the generated current.

The present invention relates to an apparatus for correcting a temperature sensing signal of an IGBT temperature sensing device which outputs only a temperature sensing signal having a voltage value equal to or higher than a preset voltage value, by using an output limiting diode. The apparatus includes: a calculating part configured to calculate a conduction current value of the output limiting diode by using the resistance of an NTC thermistor included in the IGBT temperature sensing device; a determining part configured to determine a drop voltage value of a voltage drop occurring in the output limiting diode based on the conduction current value; and a correcting part configured to correct the temperature sensing signal by increasing the voltage of the temperature sensing signal output from the IGBT temperature sensing device by the drop voltage value.

A temperature detector and method of measuring temperature to obtain temperature readings in environments, such as fluids and gasses, by measuring electrical characteristics of the temperature detector that are influenced by the temperature. The temperature detector can be arranged such that a plurality of measurements can be obtained to provide sufficient diversity and redundancy of the measurements for enhanced diagnostics to be performed, such as optimization for fast dynamic response, calibration stability, in-situ response time testability, and in-situ calibration testability.

The invention relates to a device (100) for calibrating the temperature of a fiber-optic temperature sensor, with which an optical fiber (10) of a fiber-optic temperature sensor is to be provided. The device (100) comprises a device body (101) having a passage (109) through which the optical fiber (10) is to pass, and a means for transferring heat energy. The device (100) further comprises at least one portion (160a), referred to as a first fixed point, which is made from a first material having at least a first predefined temperature at which the state thereof changes. The first fixed point (160a) is thermally connected to the optical fiber (10) when the optical fiber (10) is provided with the device (100). The heat-transferring means is arranged in the device body (101) such that, during the actuation thereof, the heat-transferring means exchanges heat energy with the first fixed point (160a) so as to cause a change in the state thereof at the first predefined temperature.

The invention relates to a device (100) for calibrating the temperature of a fiber-optic temperature sensor, with which an optical fiber (10) of a fiber-optic temperature sensor is to be provided. The device (100) comprises a device body (101) having a passage (109) through which the optical fiber (10) is to pass, and a means for transferring heat energy. The device (100) further comprises at least one portion (160a), referred to as a first fixed point, which is made from a first material having at least a first predefined temperature at which the state thereof changes. The first fixed point (160a) is thermally connected to the optical fiber (10) when the optical fiber (10) is provided with the device (100). The heat-transferring means is arranged in the device body (101) such that, during the actuation thereof, the heat-transferring means exchanges heat energy with the first fixed point (160a) so as to cause a change in the state thereof at the first predefined temperature.