摘要:
The invention relates to a temperature measuring module (TCM) having position compensation, wherein the temperature measuring module (TCM) is provided to be connected to a thermocouple (T A ) or a plurality of thermocouples (T A , T B , T C ,... T N ). A thermocouple has two metallic conductors (L1, L2), wherein the two metallic conductors have a different chemical composition, at least to some extent, wherein the two metallic conductors (L1, L2) are connected in an electrically conductive and a point-like manner at the measurement point (10), wherein an electric thermocouple voltage (U thermo ) is formed between the two conductors (L1, L2) at the reference point (R) as a function of the temperature difference (ΔT) between the first temperature (T 1 ) and the second temperature (T 2 ). The temperature measuring module (TCM) also has a temperature-dependent resistor (PT) via which the temperature (T1) of the reference point (R) can be registered as a resistance voltage (U abs ). The temperature measuring module (TCM) also has an evaluation circuit (A) which permits a first temperature value (T mess1 ) of the measurement point (M) to be determined by means of the electric resistance voltage (U abs ) and the thermocouple voltage (U thermo ). The temperature measuring module (TCM) also has a compensation means (K), which changes the first temperature value (T mess1 ) as a function of the installation position of the temperature measuring module (TCM), such that it is at least partly possible to compensate for thermal influences of the evaluation circuit (A) that act thermally on the reference point (R) and/or the measurement point (M) as a function of position.
摘要:
A circuit affixed to a moving part of an engine for sensing and processing the temperature of the part. The circuit generates a signal representative of the temperature sensed by a thermocouple (110) and amplified by an amplifier (112). A square wave oscillator (113) with a temperature sensitive capacitor (C8) varies its frequency in response to changes of a local temperature of the circuit. A chopper (114, J27) converts the output of the amplifier into an alternating current signal. The chopper is gated by the square wave oscillator and a second input is coupled to an output of the amplifier. Thus, the chopper has an output signal having a frequency representative of the local temperature and an amplitude representative of the thermocouple temperature, whereby the combined signals represent the true temperature of the part
摘要:
A thermocouple measuring circuit for sensing a temperature at a measuring point is provided. The thermocouple measurement circuit (12) includes a thermocouple input for sensing a temperature at a measuring point, a compensation circuit (14) for compensating thermocouple effects of junctions of the thermocouple, and an instrumentation amplifier (16) for summing an output of the thermocouple and an output of the compensation circuit and outputting a voltage indicative of the temperature sensed, wherein the output of the compensation circuit is a reference voltage for the output of the instrumentation amplifier. Various embodiments of the thermocouple measurement circuit may be employed in electrosurgical generators for controlling output power dependent on temperature conditions.
摘要:
A transmitter (10) in a process control loop (12) measures temperature. A calibrator (60) includes a known calibration element (64) which is connected to the transmitter (10). Software in the transmitter (10) compares a measured value of the calibration element (64) with the actual value of the calibration element (64) and responsively calibrates the transmitter (10). The calibrator (60) includes a temperature calibration sensor (70) for coupling to a terminal block (14) of the transmitter (10). The temperature calibration sensor (70) provides an actual temperature input to the transmitter (10). The transmitter (10) measures actual temperature of the terminal block (14) and compares actual temperature with a temperature measured by an internal terminal block temperature sensor (34), and responsively calibrates the internal temperature sensor (34).
摘要:
L'invention concerne un dispositif de mesure de température d'un corps comportant un thermocouple (18) et un système de traitement (22) de la mesure de la température et comportant de plus deux fils de connexion (23 et 24) de même métal différent des deux métaux constituant le thermocouple (18) et destinés à le relier au système de traitement des moyens de jonction (27) de ces fils (23 et 24) au thermocouple (18), situés aux points (S et F) de soudure froide et un dispositif de mesure (28) de température de ces moyens de jonction situé à proximité de ces moyens.
摘要:
Apparatus for making a transition from leads (12-26) of a temperature measuring thermocouple to extension wires (44-58) within a hermetically sealed cable sheath (60) of small diameter. The interior of the cable sheath (60) is shielded from electromagnetic radiation by an electrically conductive liner (62). A thermally conductive, electrically Insulating material (66) surrounds the intermediate junctions (28-42). The temperature of the intermediate junctions (28-42) is measured (64) providing a signal to compensate the voltage generated by the temperature measuring thermocouples due to the thermoelectric effect of the intermediate junctions (28-42).
摘要:
The present invention relates to a method for temperature drift compensation of a temperature measurement device using a thermocouple. According to the method for temperature drift compensation of the temperature measurement device using the thermocouple of the present invention, the temperature drift may be compensated for through reference junction compensation alone using a thermistor for reference junction compensation without providing a separate temperature measurement element. Thereby, precision of a measured temperature doesn't change despite change in temperature of the surroundings measured by the temperature measurement device, and the manufacturing cost may be effectively reduced.
摘要:
The present invention relates to a method for temperature drift compensation of a temperature measurement device using a thermocouple. According to the method for temperature drift compensation of the temperature measurement device using the thermocouple of the present invention, the temperature drift may be compensated for through reference junction compensation alone using a thermistor for reference junction compensation without providing a separate temperature measurement element. Thereby, precision of a measured temperature doesn't change despite change in temperature of the surroundings measured by the temperature measurement device, and the manufacturing cost may be effectively reduced.
摘要:
La présente invention concerne un connecteur miniature avec l'électronique embarquée pour thermocouple, caractérisé en ce qu'il incorpore :
deux moyens de connexion (20, 21) d'un thermocouple (1) à un circuit imprimé (4) reliant les éléments de l'électronique embarquée ; trois moyens de connexion (230, 231, 232) des circuits imprimés (4) à un câble (3) d'alimentation du connecteur et de transfert du signal mis en forme par l'électronique embarquée ; des moyens (24) de mesure de la température ambiante dans le connecteur disposés entre les deux moyens de connexion (20, 21) du thermocouple ; des moyens (25, 26, 27, 29) d'amplification du signal délivré par le thermocouple (1) et de mise à l'échelle du signal délivré par le moyen de mesure de la température ambiante (24), ces moyens (25, 26, 27, 29) effectuant également la sommation de ces deux signaux ainsi que la linéarisation du signal résultant de cette sommation.
摘要:
L'invention concerne un procédé de compensation thermique d'une thermopile disposée dans un boîtier de capteur, caractérisé en ce qu'il met en oeuvre :
a) la génération d'une première tension U 1 qui est fonction d'une température objet T obj , et d'une température T th du boîtier (2) de capteur, et d'une deuxième tension U 2 qui est proportionnelle à la température T th du boîtier de capteur. b) la conversion analogique-numérique de la première tension U 1 et de la deuxième tension U 2 . c) le calcul de la température objet T obj à partir desdites tensions U 1 et U 2 numérisées.