Highly sensitive magnetic field detecting device.

摘要

A highly sensitive magnetic field detecting device using a DC SQUID for detecting a magnetic field to measure the element characteristics of the DC SQUID. In the highly sensitive magnetic field detecting device, a feedback modulation circuit is equipped with an external input terminal for inputting a signal from the outside at the time of measuring flux-to-voltage characteristics of the DC SQUID. A bias circuit is equipped with an external input terminal for inputting a bias current at the time of measuring current-to-voltage characteristics. An amplifier for amplifying the output of the DC SQUID is equipped at its output with an amplifier output terminal.