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TGM46-68B-12L Datasheet(PDF) 8 Page - NEC |
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TGM46-68B-12L Datasheet(HTML) 8 Page - NEC |
8 / 31 page 2010.03.19 9307PIEVOL04E ●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data. ●Please request for a specification sheet for detailed product data prior to the purchase. ●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog. 8 Piezoelectric Ceramics Vol.04 NEP b) VoItage output constant This is the intensity of the electric field caused when a specified amount of stress is applied to a material that is in the condition of zero displacement. Voltage output constant is calculated with Eq. 16. Constants d and constants g can be d31,d33, or d15, and g31, g33, or g15, depending on the type of vibration. This is the temperature at which polarization disappears and the piezoelectric qualities are lost. It is also the temperature at which the value of the dielectric constant becomes maximum. g d Vm N =⋅ ( ) ε / 7) Curie temperature · · · · · · · · · · · · · · · · · · · · · · · · (16) The temperature coefficient is a measure of the variation of the resonant frequency and static capacitance with change in temperature. Temperature coefficient is calculated with Eqs. 17 and 18. Where TK(f) : Temperature coefficient of resonant frequency (PPm/˚C) f (t1) : Resonant frequency at temperature t1˚C(Hz) f (t2) : Resonant frequency at temperature t2˚C(Hz) f20 : Resonant frequency at temperature 20˚C(Hz) TK(C) : Temperature coefficient of static capacitance (PPm/˚C) C (t1) : Static capacitance (F) at temperature t1˚C C (t2) : Static capacitance (F) at temperature t2˚C C20 : Static capacitance at 20˚C(F) Δt : Temperature difference (t2–t1) (˚C ) 8) Temperature coefficient · · · · (17) · · (18) The aging rate is an index of the change in resonant frequency and static capacitance with age. To calculate this rate, after polarization the electrodes of a transducer are shorted together, and are heated for a specified period of time. Measurements are taken of the resonant frequency and static capacity every 2 n days. (That is, at 1, 2, 4, and 8 days.) The aging rate is calculated with Eq. 19. Where (AR) : Aging rate for resonant frequency or static capacitance t1,t2 : Number of days aged after polarization Xt1,Xt2 : Resonant frequency or static capacitance at t1 and t2 days after polarization () log log AR tt Xt Xt Xt = − ⋅ − 1 21 2 1 1 The density is calculated with Eq. 20, after determining the volume and weight of the specified ceramic material. Where W : Weight (kg) of ceramic material V : Volume (m3) of material D W V kg m = ( ) / 3 9) Aging rate 10) Density · · · · · · · · · · · · (19) · · · · · · · · · · · · · · · · · · · · · · · · · (20) TK f t ft ft f PPm C TK C t Ct Ct C PPm C () () ( ) (/ ) () () ( ) (/ ) =⋅ − ×° =⋅ − ×° 1 10 1 10 12 20 12 20 6 6 Δ Δ |
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