| 摘要 |
A laminated dielectric thickness detection device, being able to improve the sensitivity of the entire laminated dielectric thickness detection device while eliminating the zero voltage impact, by disposing, before an A/D converter (23), an appropriately amplified subtraction amplification unit (28) used for eliminating the zero voltage impact of thickness voltage. The laminated dielectric thickness detection device comprises a thickness sensor (21), a position voltage conversion unit (22), an A/D converter (23) and a control processor (24) all sequentially connected, and further comprises a dielectric position detection unit (25), a timer unit (26), a D/A converter (27) and a subtraction amplification unit (28); the dielectric position detecting unit (25) is connected to the control processor (24) and is used to detect whether a detected dielectric passes through; the timer unit (26) is connected to the control processor (24); two ends of the D/A converter (27) are respectively connected to the control processor (24) and the reverse phase input end of the subtraction amplification unit (28); and the normal phase input end, reverse phase input end and output end of the subtraction amplification unit (28) are respectively connected to the position voltage conversion unit (22), the D/A converter (27) and the A/D converter (23). Also provided is a laminated dielectric thickness detection method. |
