Imigomo Yobuchwepheshe Yenzwa ye-Thermistor Temperature Sensor

I-Zero Power Resistance Value RT (Ω)

I-RT ibhekisela enanini lokumelana elilinganiswa ngezinga lokushisa elishiwo T kusetshenziswa amandla alinganisiwe abangela ushintsho oluncane kunani lokumelana elihlobene nephutha lesamba lokulinganisa.

Ubudlelwano phakathi kwevelu yokumelana nokushintsha kwezinga lokushisa kwezingxenye ze-elekthronikhi bumi kanje:

I-RT = I-RN expB(1/T – 1/TN)

I-RT: I-NTC thermistor ukumelana nezinga lokushisa elingu-T (K).

I-RN: I-NTC thermistor ukumelana nezinga lokushisa elilinganiselwe TN (K).

T: Izinga lokushisa elicacisiwe (K).

B: I-Material constant ye-NTC thermistor, eyaziwa nangokuthi inkomba yokuzwela kwe-thermal.

exp: i-eksponenti esekelwe enombolweni engokwemvelo u-e (e = 2.71828…) .

Ubudlelwano buyasetshenziswa futhi bunezinga elithile lokunemba ngaphakathi kwebanga elilinganiselwe lezinga lokushisa elilinganiselwe elingu-TN noma i-RN elinganiselwe yokumelana, njengoba into engu-B engaguquki iwumsebenzi wezinga lokushisa elingu-T.

Ilinganiselwe Ukumelana Nomandla Kaziro R25 (Ω)

Ngokwezinga likazwelonke, inani elilinganiselwe lokumelana namandla anguziro linani lokumelana no-R25 elilinganiswa ne-NTC thermistor ezingeni lokushisa eliyinkomba elingu-25 ℃. Leli nani lokumelana liyinani elijwayelekile lokumelana le-NTC thermistor. Ngokuvamile wathi i-NTC thermistor ukuthi ingakanani inani lokumelana, iphinde ibhekisele enanini.

I-Material Constant (inkomba yokuzwela okushisayo) inani elingu-B (K)

Amanani B achazwa ngokuthi:

I-RT1: Ukumelana kwamandla anguziro ezingeni lokushisa T1 (K).

I-RT2: Inani lokumelana namandla ayiziro ekushiseni kwe-T2 (K).

T1, T2: Amazinga okushisa amabili acacisiwe (K).

Kuma-thermistors e-NTC avamile, inani elingu-B lisukela ku-2000K ukuya ku-6000K.

I-Zero Power Resistance Temperature Coefficient (αT)

Isilinganiso soshintsho oluhlobene ekumelaneni namandla aziro we-thermistor ye-NTC ezingeni lokushisa elicacisiwe kuya ekushintsheni kwezinga lokushisa okubangela ushintsho.

I-αT: I-coefficient yokushisa yokumelana namandla aziro ku-temperature T (K).

I-RT: Inani lokumelana namandla ayiziro kuzinga lokushisa T (K).

T: Izinga lokushisa (T).

B: Izinto ezingaguquki.

I-Disipation Coefficient (δ)

Kuzinga lokushisa elicacisiwe le-ambient, i-coefficient yokulahla ye-NTC thermistor isilinganiso samandla ahlakazekile kusiphikisa ukuya ekushintsheni kwezinga lokushisa okuhambisanayo kwesiphikisayo.

δ : i-coefficient yokulahla ye-NTC thermistor, (mW/ K).

△ P: Amandla asetshenziswe i-NTC thermistor (mW).

△ T: I-thermistor ye-NTC idla amandla △ P, ukuguquka kwezinga lokushisa okuhambisanayo kwe-resistor body (K).

I-Thermal Time Constant ye-Electronic Components (τ)

Ngaphansi kwezimo zamandla angu-zero, lapho izinga lokushisa lishintsha kungazelelwe, izinga lokushisa le-thermistor lishintsha isikhathi esidingekayo ku-63.2% womehluko wokuqala wokushisa wokuqala. Isikhathi esishisayo esingaguquki silingana nomthamo wokushisa we-NTC thermistor futhi ngokuphambene ngokulingana ne-coefficient yayo yokulahla.

τ : isikhathi esishisayo esingaguquki (S).

C: Umthamo wokushisa we-NTC thermistor.

δ : i-coefficient yokulahla ye-NTC thermistor.

Ilinganiselwe i-Power Pn

Ukusetshenziswa kwamandla okuvumelekile kwe-thermistor ekusebenzeni okuqhubekayo isikhathi eside ngaphansi kwezimo zobuchwepheshe ezicacisiwe. Ngaphansi kwala mandla, izinga lokushisa lomzimba wokumelana alidluli izinga lokushisa eliphezulu lokusebenza.

Izinga lokushisa eliphezulu lokusebenzaTmax: izinga lokushisa eliphezulu lapho i-thermistor ingasebenza khona ngokuqhubekayo isikhathi eside ngaphansi kwezimo zobuchwepheshe ezicacisiwe. Okungukuthi, T0- Ambient lokushisa.

Izingxenye zikagesi zikala amandla Pm

Ezingeni lokushisa elicacisiwe le-ambient, inani lokumelana lomzimba wokumelana elishisiswe yimanje lokulinganisa lingashaywa indiva maqondana nephutha lesilinganiso esiphelele. Ngokuvamile kuyadingeka ukuthi ukuguqulwa kwenani lokumelana kukhulu kuno-0.1%.