Qhov sib txawv ntawm qhov ntsuas kub infrared thiab ntsuas kub ntsuas
Kub sensors feem ntau muab faib ua kev sib cuag thiab tsis sib cuag sensors. Tiv tauj qhov ntsuas kub: Qhov ntsuas qhov ntsuas ntawm qhov ntsuas qhov sib tiv tauj tau zoo sib cuag nrog cov khoom ntsuas, tseem hu ua tus ntsuas kub. Tsis sib cuag kub sensor: Nws cov khoom rhiab heev thiab cov khoom ntsuas tsis nyob rau hauv kev sib cuag nrog ib leeg, los yog hu ua non-contact ntsuas ntsuas. Cov cuab yeej no tuaj yeem siv los ntsuas qhov kub ntawm qhov txav ntawm cov khoom txav, lub hom phiaj me me thiab cov khoom uas muaj peev xwm ua kom sov me me lossis hloov qhov kub ceev (ntev), thiab tseem tuaj yeem siv los ntsuas qhov ntsuas kub ntawm qhov kub thiab txias. Feem ntau siv cov ntsuas kub tsis sib cuag yog raws li txoj cai tseem ceeb ntawm lub cev hluav taws xob dub thiab hu ua hluav taws xob ntsuas hluav taws xob.
NTC thiab RTD siab precision kub sensor
Kub sensor: Feem ntau, qhov ntsuas qhov tseeb yog siab. Nyob rau hauv ib qho kev ntsuas kub, tus pas ntsuas kub kuj tseem tuaj yeem ntsuas qhov ntsuas kub hauv qhov khoom. Txawm li cas los xij, rau cov khoom txav, lub hom phiaj me me lossis cov khoom muaj peev xwm ua kom sov me me, kev ntsuas loj yuav tshwm sim. Feem ntau siv cov ntsuas kub muaj xws li bimetallic thermometers, iav kua ntsuas kub, ntsuas kub siab, ntsuas kub tsis kam, ntsuas cua sov, thiab cov thermocouples. Lawv tau siv dav hauv kev lag luam, kev ua liaj ua teb, kev lag luam thiab lwm yam sectors. Tib neeg kuj feem ntau siv cov ntsuas kub no hauv lub neej txhua hnub. Nrog rau kev siv dav siv thev naus laus zis hauv kev tiv thaiv hluav taws xob hauv teb chaws, thev naus laus zis thev naus laus zis, metallurgy, hluav taws xob, khoom noj khoom haus, tshuaj, petrochemical thiab lwm lub tuam tsev thiab kev tshawb fawb ntawm superconducting thev naus laus zis, cryogenic thermometers rau ntsuas kub qis dua 120K tau tsim, xws li cryogenic gas thermometers. , steam Pressure thermometers, acoustic thermometers, paramagnetic ntsev pas ntsuas kub, quantum thermometers, tsis tshua muaj kub thermal kuj thiab tsis tshua muaj kub thermocouples, thiab lwm yam. Cryogenic tus pas ntsuas kub xav tau cov ntsuas kub me me, qhov raug siab, zoo reproducibility thiab stability. Cov iav carburized thermal kuj ua los ntawm cov ntxeem tau siab silica iav carburized thiab sintered yog ib hom kev ntsuas kub ntawm qhov ntsuas kub qis, uas tuaj yeem siv los ntsuas qhov kub ntawm qhov ntau ntawm 1.6 ~ 300K.
infrared kub sensor
Infrared sensor: Ib lub sensor uas siv lub cev lub zog ntawm cov hluav taws xob infrared los ntsuas. Infrared ray, tseem hu ua lub teeb infrared, muaj cov khoom xws li kev xav, refraction, tawg, cuam tshuam, thiab nqus. Txhua yam khoom, tsuav yog nws muaj qhov kub thiab txias (siab tshaj li xoom), tuaj yeem tawg rays infrared. Lub infrared sensor tsis nyob rau hauv kev sib cuag ncaj qha nrog cov khoom ntsuas thaum lub sij hawm ntsuas, yog li tsis muaj kev sib txhuam, thiab nws muaj qhov zoo ntawm siab rhiab heev thiab teb ceev ceev. Lub infrared sensor muaj xws li ib tug optical system, ib tug nrhiav kom tau lub caij thiab ib tug hloov dua siab tshiab Circuit Court. Optical systems yuav muab faib ua ob hom: transmissive thiab reflective raws li lawv cov qauv. Cov khoom kuaj pom tuaj yeem muab faib ua cov khoom siv hluav taws xob thiab cov khoom siv hluav taws xob tshawb pom raws li kev ua haujlwm. Thermistors yog cov feem ntau siv thermal Cheebtsam. Thaum lub thermistor raug rau cov hluav taws xob infrared, qhov kub thiab txias tau hloov pauv (qhov kev hloov pauv no yuav loj dua lossis me dua, vim tias cov thermistor tuaj yeem muab faib ua qhov zoo kub coefficient thermistors thiab qhov kub tsis zoo coefficient thermistor), Nws dhau los ua cov teeb liab hluav taws xob tso tawm los ntawm ib qho hluav taws xob. kev hloov pauv Circuit Court. Photosensitive ntsiab feem ntau yog siv nyob rau hauv photoelectric nrhiav tau hais tias, feem ntau yog ua los ntawm cov ntaub ntawv xws li lead sulfide, lead selenide, indium arsenide, antimony arsenide, mercury cadmium telluride ternary alloy, germanium thiab silicon doping.
Cov qauv thiab kev teeb tsa ntawm Piezoelectric Acceleration Sensor
Cov qauv ntawm cov nquag siv piezoelectric acceleration sensor tau muab faib ua: lub caij nplooj ntoos hlav, qhov loj, lub hauv paus, lub ntsiab lus piezoelectric, thiab lub nplhaib clamping. Lub piezoelectric element-mass-caij nplooj ntoos hlav system yog mounted rau ntawm ib ncig lub hauv paus ncej, uas yog txuas nrog lub hauv paus. Cov qauv no muaj lub siab resonant zaus. Txawm li cas los xij, thaum lub hauv paus txuas nrog cov khoom ntsuas, yog tias lub hauv paus yog deformed, nws yuav cuam tshuam ncaj qha rau cov zis ntawm kev vibration pickup. Tsis tas li ntawd, kev hloov pauv ntawm cov khoom ntsuas thiab qhov ntsuas kub ntawm qhov ntsuas kub yuav cuam tshuam rau lub piezoelectric caij thiab ua rau muaj kev hloov pauv hauv preload, uas tuaj yeem ua rau kub drift. Lub ntsiab piezo yog clamped rau daim duab peb sab hauv nruab nrab ncej los ntawm lub nplhaib clamping. Thaum lub piezoelectric acceleration sensor paub axial kev co, lub piezoelectric caij bears shear stress. Cov qauv no muaj qhov cuam tshuam zoo rau kev sib cais ntawm lub hauv paus deformation thiab kub hloov pauv, thiab muaj qhov siab resonance zaus thiab zoo linearity. Lub annular shear hom muaj cov qauv yooj yim thiab tuaj yeem ua rau hauv ib qho me me accelerometer nrog high resonance zaus. Lub annular loj thaiv yog glued mus rau lub annular piezoelectric caij mounted ntawm lub hauv paus ncej. Txij li thaum lub binder softens nrog nce kub, qhov siab tshaj plaws kev khiav hauj lwm kub yog txwv.
Lub siab txwv zaus ntawm piezoelectric acceleration sensor nyob ntawm qhov resonance zaus nyob rau hauv lub amplitude-frequency nkhaus. Feem ntau, rau piezoelectric acceleration sensors nrog me me damping (z<=0.1), if the upper limit frequency is set to 1/3 of the resonance frequency, the amplitude can be guaranteed. The error is less than 1dB (ie 12%); if it is taken as 1/5 of the resonance frequency, the amplitude error is guaranteed to be less than 0.5dB (ie 6%), and the phase shift is less than 30. However, the resonant frequency is related to the fixed condition of the piezoelectric acceleration sensor. The amplitude-frequency curve given by the piezoelectric acceleration sensor when it leaves the factory is obtained under the fixed condition of rigid connection. The actual fixing method is often difficult to achieve a rigid connection, so the resonance frequency and the upper limit frequency of use will decrease. Among them, the use of steel bolts is a method to make the resonance frequency reach the factory resonance frequency. Do not screw all the bolts into the screw holes of the base, so as not to cause deformation of the base and affect the output of the piezoelectric acceleration sensor. Apply a layer of silicone grease to the mounting surface to increase connection reliability on uneven mounting surfaces. Insulation bolts and mica gaskets can be used to fix the piezoelectric acceleration sensor when insulation is required, but the gasket should be as thin as possible. Use a thin layer of wax to stick the piezoelectric acceleration sensor on the flat surface of the test piece, and it can also be used in low temperature (below 40°C) occasions. The hand-held probe vibration measurement method is particularly convenient to use in multi-point testing, but the measurement error is large and the repeatability is poor. The upper limit frequency is generally not higher than 1000Hz. The piezoelectric acceleration sensor is fixed with a special magnet, which is easy to use and is mostly used in low-frequency measurement. This method can also insulate the piezoelectric acceleration sensor from the test piece. Fixing methods with hard bonding bolts or adhesives are also commonly used. The resonant frequencies of a typical piezoelectric accelerometer using the above-mentioned various fixing methods are about: steel bolt fixing method 31kHz, mica gasket 28kHz, coated wax layer 29kHz, hand-held method 2kHz, magnet fixing method 7kHz.
Ob peb txoj hauv kev rau kev txiav txim ua ntej ntawm cov av noo Sensor Performance
Nyob rau hauv rooj plaub uas qhov tseeb calibration ntawm cov av noo sensor yog ib qho nyuaj, ib co yooj yim txoj kev yuav siv tau los txiav txim thiab xyuas cov kev ua tau zoo ntawm cov av noo sensor.
1. Kev txiav txim siab sib xws. Yuav ntau tshaj ob qhov av noo sensor khoom ntawm tib hom thiab tib lub chaw tsim khoom ib zaug. Qhov ntau dua, qhov teeb meem yuav raug piav qhia. Muab lawv ua ke thiab sib piv cov txiaj ntsig pom qhov txiaj ntsig. Nyob rau hauv tej yam kev mob uas ruaj khov, soj ntsuam qhov sib xws ntawm qhov kev xeem. Rau kev sim ntxiv, nws tuaj yeem sau tseg ntawm ntu hauv 24 teev. Feem ntau, muaj peb hom av noo thiab qhov kub thiab txias nyob rau hauv ib hnub, siab, nruab nrab thiab qis, kom qhov sib xws thiab ruaj khov ntawm cov khoom tuaj yeem pom ntau dua, suav nrog cov yam ntxwv ntawm qhov kub thiab txias.
2. Humidify lub sensor los ntawm exhaling nrog koj lub qhov ncauj los yog siv lwm yam humidification txoj kev, thiab soj ntsuam nws rhiab heev, repeatability, kev ua tau zoo ntawm dehumidification thiab dehumidification, kev daws teeb meem, ntau yam ntawm cov khoom, thiab lwm yam.
3. Ntsuas cov khoom nyob rau hauv ob qho tib si qhib thiab kaw lub thawv. Sib piv seb lawv zoo ib yam thiab saib xyuas cov nyhuv thermal.
4. Ntsuam xyuas cov khoom nyob rau hauv lub xeev kub kub thiab tsis tshua muaj kub lub xeev (raws li phau ntawv txheej txheem), thiab muab piv nrog rau cov ntaub ntawv ua ntej qhov kev ntsuam xyuas nyob rau hauv lub qub xeev, xyuas cov kub adaptability ntawm cov khoom, thiab soj ntsuam qhov sib xws ntawm cov khoom. . Qhov kev ua tau zoo ntawm cov khoom yuav tsum tau ua tiav raws li cov qauv kev sim thiab ua tiav ntawm lub tuam tsev tshuaj xyuas zoo. Cov kua ntsev saturated yog siv rau calibration, thiab cov khoom kuj tseem siv tau rau kev sib piv kom pom. Cov khoom yuav tsum tau calibrated rau lub sij hawm ntev nyob rau hauv lub sij hawm ntev siv nyob rau hauv thiaj li yuav txiav txim qhov zoo ntawm cov av noo sensor ntau comprehensively.
