36results about How to "High temperature measurement sensitivity" patented technology

The invention discloses a high-sensitivity temperature measurement method based on near-infrared fluorescence of different rare earth ions. By measuring different temperatures, Nd 3+ ions around 710nm‑920nm and Er 3+ The near-infrared light of ions near 1400nm‑1700nm compares the fluorescence intensities of the two bands to obtain the functional relationship between FIR and temperature. When the sample is placed in the environment to be tested, the fluorescence intensity ratio is calculated, and the temperature of the environment to be tested is obtained by using the above functional relationship. The two temperature-measuring light bands used in the present invention come from non-thermally coupled energy levels without any overlap, which facilitates data processing. At the same time, Er 3+ The infrared light belongs to the down-conversion process, the quantum yield is high, the pumping power of the required laser is small, and higher fluorescence intensity can be obtained. At the same time, the two fluorescence intensities have opposite trends with temperature. Compared with the result that the intensities of the two fluorescence bands used in the current technology have the same or close variation with temperature, the temperature measurement sensitivity of the present invention is greater.

The invention relates to an optical temperature measurement material with high sensitivity and signal discrimination, a preparation method and application thereof. The optical temperature measurement material has an atomic ratio composition represented by general formula (I): Sr 3 La (1‑x‑y) Na(PO 4 ) 3 F:Tb x , Eu y (I), wherein, 0.01≤x≤0.5, 0.005≤y≤0.5, 0.015≤x+y≤1, which is prepared by a high-temperature solid-phase method; under the effective excitation of ultraviolet light, the Tb 3+ with Eu 3+ As the dual luminescent centers simultaneously emit their respective characteristic spectra, by monitoring the two characteristic spectra, the temperature is calibrated by using the fluorescence intensity ratio of the dual luminescent centers. Compared with the prior art, the temperature measurement material of the present invention has a large signal discrimination (545nm / 700nm), high temperature measurement sensitivity (relative temperature measurement sensitivity is about 0.70% / K), and a wide temperature measurement range (303K-483K) .

The invention relates to a multilayer thin-film type temperature-sensitive thermo-responsive chip with a high sensitivity. The temperature-sensitive thermo-responsive chip comprises a substrate, a ceramic body, and two metal end electrodes. The surface of the substrate is divided into a middle area and two end areas respectively arranged at two sides of the middle area. The ceramic body is arranged at the middle area. The two metal end electrodes are respectively arranged at the two end areas. The ceramic body is of a tortuous connected layered structure, which is formed by laminating N layersof ceramic films at intervals, wherein N is a natural number greater than or equal to 2. A metal film is arranged between each two adjacent ceramic films, and a metal film is arranged between the bottommost ceramic film and the substrate. Each metal film is only connected with one of the metal end electrodes. The invention further relates to a preparation method of the multilayer thin-film type temperature-sensitive thermo-responsive chip with the high sensitivity. According to the temperature-sensitive thermo-responsive chip, the small size, the low resistance value and the high B value canbe realized at the same time.

The invention discloses a method for producing a planar thermopile for thermometers capable of rapidly measuring the distribution of the surface temperature difference between two objects placed on the same level. The method has the following four characteristics: the thermopile is a replaceable element, the number of thermocouples forming the thermopile can be conveniently changed by adjusting the processing technique, a produced thermopile temperature sensor has 200 sets of thermocouples in the area of 85mm multiplied by 50mm, and according to need, the number of the thermocouples can be increased by reducing the line width and the distance between lines. The time constant of the thermopile is low, and transient temperature difference can be measured. The surface area of the thermopile can be changed according to requirement in order to be adapted to temperature difference measurement at different distances. The structure of the thermopile is compact and simple, and the thermopile is convenient to mount, and can be used for measuring little heat.

The invention claims a fluorescence intensity ratio temperature measurement method based on charge transfer band edge anomalous thermal quenching, and the invention relates to a fluorescence intensity ratio temperature measurement method based on charge transfer band anomalous thermal quenching. The purpose of the present invention is in order to solve the problem that traditional based on rare earth ion thermal coupling energy level fluorescence intensity ratio temperature measurement sensitivity is lower, method: (1) with Eu 3+ :NaLaCaWO 6 It is a temperature-sensitive material; (2) In the temperature range from 298K to 528K, the fluorescence intensity ratio I 308 / I 354 As the temperature increases, it gradually increases, and there is a monotonous functional relationship with the temperature T. The functional relationship between the intensity ratio and temperature is the temperature measurement curve, and the purpose of temperature measurement can be achieved by monitoring the fluorescence intensity ratio. The temperature measurement sensitivity obtained by the temperature measurement method of the present invention can reach 2.23%K at 298K ‑1 . Compared with the traditional temperature measurement method, the sensitivity at 298K is increased by 4.37 times. The temperature measuring method of the invention has higher sensitivity. The invention is applied to the field of rare earth fluorescence temperature measurement.

The invention relates to a method for improving the temperature measurement sensitivity of the fluorescence intensity ratio technology in the high temperature range by utilizing a double luminescence center strategy. The purpose of the present invention is to solve the problem that it is difficult to realize high-precision temperature measurement in a higher temperature range by using traditional fluorescence intensity ratio temperature measurement technology. Method: (1) prepare temperature measurement samples; (2) at low temperature Interval utilizes traditional Er 3+ of 2 h 11 / 2 - 4 I 15 / 2 and 4 S 3 / 2 - 4 I 15 / 2 The fluorescent band is used for temperature measurement, and the Er is used in the high temperature range 3+ of 4 S 3 / 2 - 4 I 15 / 2 and Tm 3+ of 3 f 3 - 3 h 6 The fluorescent band generated by the transition is used for temperature measurement; the present invention utilizes the dual luminescence center strategy to effectively improve the temperature measurement sensitivity of the fluorescence intensity ratio technology in a higher temperature range, and the present invention is applied to the field of rare earth fluorescence temperature measurement.

The invention discloses a lanthanum-oxide-added binary thermistor material. The thermistor material comprises the following components in percentages by weight: 70%-80% of Mn2O3, 10%-28% of Co2O3 and 0.5%-2.0% of lanthanum oxide. According to the manganese-cobalt binary formula disclosed by the prior art, if the B value is required to obtain 5,500-6,000K under the condition of not adding special additives, the resistivity can only be 10,000-50,000 (kOmega.mm), and the B value of the lanthanum-oxide-added binary thermistor material is 5,500-6,000K and the resistivity is 150-300 (kOmega.mm). The lanthanum-oxide-added binary thermistor material has relatively large B value, the resistivity can be more moderate and applied in a wide range, the temperature sensitivity is relatively high and the lanthanum-oxide-added binary thermistor material has relatively strong stability.

A temperature measurement method based on the ratio of fluorescence intensity of mixed temperature-sensing materials, the invention relates to a method of temperature measurement based on ratio of fluorescence intensity of mixed temperature-sensing materials. The purpose of the invention is to solve the problem that the temperature measurement method in the high temperature range cannot have high sensitivity and low uncertainty. Method: (1) with Eu 3+ : AVO 4 with Cr 3+ :Al 2 o 3 The mixed material is a temperature-sensitive material; (2) in the temperature range of 543 to 673K, the fluorescence intensity ratio I 618 / I 694 As the temperature increases, it gradually increases, and there is a monotonous functional relationship with the temperature T, which can be fitted by a polynomial, and the purpose of temperature measurement can be achieved by monitoring the fluorescence intensity ratio. The temperature measuring method of the invention has good repeatability, high sensitivity and low uncertainty. The invention is applied to the field of rare earth fluorescence temperature measurement.

A temperature sensing method based on a liquid-filled hollow-core annular fiber grating. A long-period fiber grating is engraved on the upper half ring of the hollow-core annular fiber, and this asymmetric long-period fiber grating divides the incident line polarization fundamental mode HE 11x converted to TE 01 mode and HE 21x model. input HE 11x Due to the loss of light energy, the mode forms a resonance valley in its transmission spectrum, and the center wavelength of the resonance valley is the resonance wavelength. The hollow core of the hollow-core annular fiber is filled with a refractive index matching liquid with a high thermo-optic coefficient. When the ambient temperature changes, the refractive index value of the refractive index matching liquid changes, causing the grating resonance wavelength position to change. The temperature sensing system consists of a wide-spectrum light source, an input single-mode fiber, a polarization-maintaining fiber, a hollow-core annular fiber grating, an output single-mode fiber and a spectrum analyzer. As the temperature increases, the grating resonance wavelength increases linearly. This method has the advantages of good stability and high sensitivity.

The invention discloses a rare-earth organic framework material for fluorescent temperature sensation imaging in biological tissue and cells. The rare-earth organic framework material has the long-range ordered crystal structure and regular pores. The chemical formula is [LnLx(G)(H2O)].(G)n, wherein Ln is rare earth Eu or Tb, L is an organic ligand simultaneously containing benzene carboxylic acid group and triazinyl group, G represents a solvent molecule which is coordinated with rare-earth ions or in the crystal pores, x=1-3, and n=1-4. The rare-earth organic framework material is prepared by the solvothermal method which is simple and has higher yield. The micro / nano rare-earth organic framework material has the characterized light emissions of two types of rare-earth ions; the strength ratio of the two peaks has favorable exponential relation to the temperature; the temperature detection range is 20-80 DEG C; as the temperature increases, the luminous color can turn red from green; and the rare-earth organic framework material has favorable biocompatibility and heat stability, can implement real-time temperature imaging in biological tissues, and is hopeful to be applied in the aspects of biomedical treatment and the like.

The invention discloses a temperature measuring method utilizing the temperature response characteristic of fluorescent single peak width, comprising: step 1, cooling or heating the fluorescent material; keeping warm at several set temperature points, and recording the temperature of each temperature point during the keeping warm value; Step 2, at each temperature point, adopt the Raman spectrometer to collect the fluorescent single peak of the fluorescent material, fit and analyze the fluorescent single peak, and obtain the FWHM value of the fluorescent single peak corresponding to each temperature point; Step 3, According to the temperature value of each temperature point and the FWHM value of the fluorescent single peak corresponding to each temperature point obtained in step 2, establish a half-maximum temperature standard curve; Step 4, place the fluorescent material in the temperature field to be measured, and collect its Fluorescence single peak, fitting and analyzing the fluorescence single peak to obtain the FWHM value of the fluorescence single peak; step 5, calculating the measured value of the temperature field to be measured, and the measurement is completed. The invention solves the problem that the fluorescence intensity ratio temperature measurement technology needs to satisfy high sensitivity, high precision and small measurement error at the same time.