SU482617A1 - Device for measuring surface irregularities - Google Patents

Description

one

The invention relates to the field of linear measurements and can be used to measure the irregularities of the surface profile.

A device for measuring irregularities of the surface of a surface, comprising a sensor that is linearly moving relative to the surface to be tested, a carrier frequency generator, a feed sensor, and a measuring carrier signal connected in series, a detector, and a recording unit are known.

However, this device does not provide sufficient accuracy in measuring surface irregularities at different pitch cutoffs.

The aim of the invention is to increase the measurement accuracy.

This is achieved in that the device is additionally equipped with a block for limiting the carrier frequency of the sensor signal with a basic signal separated from the sensor signal.

The sensor signal carrier limiting unit contains, in series, a node for amplifying and amplifying one polarity of the sensor signal to zero, an auxiliary detector, low-pass filters and a carrier frequency limiter for the signal whose amplitudes of one polarity are zero, the second input of which is connected with the exit node

amplifying and bringing the amplitudes of one polarity of the sensor signal to zero, and the output - with the input of the amplifier of the carrier frequency of the measuring signal.

The invention is illustrated by a circuit including a carrier frequency generator 1, a feed sensor 2, connected in series to an amplification and amplitude coupling unit 3.

one polarity of the sensor signal to a bullet level, an auxiliary detector 4, low-pass filters 5, a carrier frequency limiter 6, the second input of which is connected to the output of the node 3 amplifying and amplifying one polarity to zero, the amplifier 7 of the measuring signal carrier detector 8 and block 9 reglstratsii. The alternating voltage from the output of the heater 1 is applied to the sensor 2, which is moving along the lilipeane relative to the surface being tested, and is converted into an amplitude-modulated signal. The output signal of the sensor 2 is amplified in a preliminary knot, le 3, where its amplitudes of one polarity are reduced to zero. The output of the gain node is fed through an auxiliary detector 4 and low-pass filters 5 directly on the inputs of the limiter.

6 of its carrier frequency.

In the auxiliary detector 4, a signal corresponding to its envelope is extracted from the output node of the gain node. In low-pass filters, the high frequencies of the fToro signal are suppressed in excess of the frequencies for a given base length of the measured surface.

The output base signal from the output of the low-pass filters corresponding to the envelope of the irregularities of the profile of the surface being measured is limited in amplitude by the input signal of the node 3 of the amplification and bringing the amplitudes of one polarity to zero level in the limiter 6 of its carrier frequency. At the same time, the level of restriction does not intersect the signals corresponding to the unevenness of the profile of the measured surface.

As a result, at any step cutoff value, only the useful signal modulating the limited carrier frequency pulses is obtained.

The output of carrier limiter 6 is amplified in amplifier 7 and detected in detector 8.

The output signal of the detector 8, corresponding to the irregularities of the profile of the measured surface, is recorded in block 9 of the registration.

Subject invention

Claims (2)

1. A device for measuring irregularities of a surface profile containing a sensor linearly moving relative to the surface to be tested, a carrier frequency generator, a feed sensor, and a measuring carrier signal connected in series, a detector and a recording unit, characterized in that, in order to increase the accuracy measurement, it is provided with a block for limiting the carrier frequency of the sensor signal with a base signal extracted from the sensor signal. 2. The device according to claim 1, characterized in that the block for limiting the carrier frequency of the sensor signal to the base signal comprises a series-connected amplification node and bringing the amplitudes of one polarity of the sensor signal to zero, an auxiliary detector, low-pass filters and a signal carrier frequency limiter, amplitudes one polarity of which is reduced to zero level, the second input of which connected to the output of the gain node and bringing the amplitudes of one polarity of the sensor signal to zero, and the output to the input of the amplifier of the carrier frequency of the measuring signal.