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Signal processing apparatus and method of differential transformer

A technology of signal processing device and differential transformer, applied in measurement devices, electrical devices, instruments, etc., can solve the problems of re-development of magnetic heads, slow response speed, etc.

Active Publication Date: 2008-07-02
MITUTOYO CORP
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Problems solved by technology

However, in electronic micrometers that require a high precision of about 1nm in resolution, there is a problem that the response speed is slower, hundreds of milliseconds (several Hz).
[0005] On the other hand, although it is also considered to speed up the excitation frequency of the magnetic head itself, in order to add some changes in the magnetic head, it is necessary to redevelop the magnetic head

Method used

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  • Signal processing apparatus and method of differential transformer
  • Signal processing apparatus and method of differential transformer
  • Signal processing apparatus and method of differential transformer

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Embodiment Construction

[0020] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0021] The first embodiment of the present invention is as Figure 4 As shown, in the electronic micrometer with the same 5kHz bracket magnetic head or lever magnetic head (abbreviated as magnetic head) 20, drive amplifier 34, preamplifier 36, A / D converter 42 and microprocessor 44 as in the past, There is a high-frequency wave (transmission wave) oscillator 50, which generates a rectangular wave shape of a radio frequency (for example, 2.56Mhz or 5.12MHz or 10.24MHz) whose frequency is increased by 500 times to thousands of times compared with the cutoff frequency (5kHz) of the magnetic head 20 The high-frequency wave (carrier) signal; the frequency divider 52 is used to divide the high-frequency wave signal output by the high-frequency oscillator 50 (for example, after the frequency division is 1 / 512 or 1 / 1024 or 1 / 2048), as the magnetic head 20...

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Abstract

A measuring apparatus employing a differential transformer includes a high-frequency oscillator which generates a high-frequency signal having a frequency higher than the excitation frequency of the differential transformer, a frequency divider which divides the high-frequency signal to generate a driving signal for the differential transformer, a multiplier or divider which reduces the frequency of the high frequency signal by the frequency of the driving signal, a mixer which mixes the output from the multiplier or the divider with the output from the differential transformer, a high-pass filter or a band-pass filter which cuts a low-frequency component of the output from the mixer, and a double balanced mixer which synchronously detects the output from the high-pass filter or the band-pass filter with the use of the high-frequency signal. With the use of the thus configured apparatus, an output signal having a fast response speed can be obtained through the use of an existing head having a low excitation frequency.

Description

technical field [0001] The present invention relates to a signal processing device and a signal processing method of a differential transformer for obtaining a fast-response measurement signal from a differential amplifier whose excitation frequency is set low. In particular, it relates to a signal processing device and a signal processing method of a differential transformer using a conventional magnetic head with an excitation frequency of about 5 kHz suitable for a high-resolution electronic micrometer with a resolution of 1 nm. Measurement signals with a response speed of 10 times to 100 times (from 200Hz to 2kHz) can be obtained. Background technique [0002] Conventional electronic micrometers are as described in JP-A-2002-340505, such as figure 1 As shown, using a magnetic core 26 that conducts the displacement of the main shaft 22 that constitutes the magnetic head 20 and sensor coils 28 connected in series that are symmetrically arranged with respect to the mechani...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B7/00
Inventor 堀川俊朗
Owner MITUTOYO CORP
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