SU983454A1 - Method of checking object dimensiong and shape - Google Patents

Description

(54) METHOD OF CONTROL OF DIMENSIONS AND FORM OF OBJECTS

The invention relates to a measurement technique and can be used, in particular, to control the size and shape of objects.

A method is known for controlling the size and shape of objects, which consists in measuring distances for various points of the object being monitored by irradiating the object. electromagnetic or light wave... receive information about the range, the delay time of the reflected signal. in accordance with which the size and shape of the objects are judged 1.

However, according to the known method. A large number of measurements must be made and, consequently, a long measurement time is required.

The closest to the invention to the technical essence is the method. monitoring the size and shape of objects, which consists in irradiating the reference field and controlled objects with a wave field, receive and record the reflected signals from both Objects, compare these signals by which they are judged on the size and shape of the object; 2

Reference and controlled objects are irradiated with a wave field with a width

J--, where V is the propagation speed of the wavy floor, L is minimally controlled. The size of the object ..

According to a known method, the volumetric spatial spectra of signals reflected from the monitored and reference objects are recorded.

ten

The disadvantage of this method is the low productivity of the control. ..

The purpose of the invention is to increase the productivity of the control.

The goal is achieved by the fact that according to the method of controlling the size and shape of objects, it is concluded that they are irradiated with a wave field

Claims (1)

20 reference and controlled objects,. receive and record the reflected signals from both objects, compare these signals by which the size and shape of the object are judged, the reference and controlled objects are irradiated with a wave field with a bandwidth of at least g where v is the propagation speed of the wave field / L and the minimum controlled size of the object 30 , and record the frequency spectra of the signals reflected from the controlled and reference objects. The drawing shows a schematic diagram of a device implementing the predictable method. The device contains sequentially arranged generator 1, modulator 2, transmitting 3 and receiving 4 an-henna, receiver 5, unit b for measuring the frequency spectrum, memory unit 7 and unit 8 for comparison. The reference | 0bject 9 and the measured object 10 are installed in the measuring chamber 11 (anechoic radio wave or hydroacoustic chamber). The proposed method of controlling the size and shape of objects is carried out using this device in the following way. High-frequency oscillations of generator 1 are modulated by modulator 2 so that the waves transmitted by the transmitting antenna 3 have a uniform frequency spectrum in a wide frequency band not less than where v is the propagation speed of the wave field, L is the minimum controlled size of the object 10, the measuring chamber 11 is placed reference object 9, which is irradiated with a wave field. Reflected waves are received by receiver-4, amplified by receiver 5, and passed to block 6 for measuring the frequency spectrum. The latter, for example, is a series of nodes of band-pass filters tuned to different frequencies within the frequency band under study and having voltage responses proportional to the values of the measured frequency spectrum. The indicated values (frequency spectrum values) are considered to be reference and are memorized by block 7. Now the device is ready to control objects of the same type as the reference. To do this in the measuring. The chamber 11 is placed with the next measurable object 10. A similar operation of irradiation and reception of reflected waves is carried out with it. As a result, the comparison unit 8 is supplied with values from the measured spectrum obtained from the measured object 10 and from the reference object 9 from the memory unit 7. Comparison unit 8 checks their coincidence, and the presence of a match indicates the identity of the objects and vice versa. The advantage of the proposed method consists in the implementation of operational non-contact control of the dimensions of parts and other objects in the production process, with the total control time, its laboriousness and cost being smaller compared to the known methods. Additional advantages include the fact that in comparison with the known interference, where the result of the recorded interference occurs in space, smaller volumes of equipment are required here, since the observed interference occurs at the point corresponding to the location of the first receiving antenna. The latter circumstance can be particularly useful in the control of large parts or objects with limited access. Claims. The method of controlling the size and shape of objects, in fact that the reference and controlled objects are irradiated with a wave field, receive and record the reflected signals from both objects, compare these signals by which they are judged on the size and shape of the object, in order to improve the performance of the control, the reference. and the monitored objects are irradiated with a wave field with a bandwidth of at least where V is the propagation speed of the wave field L the minimum controlled size of the object, and the frequency spectra of the signals reflected from the monitored and reference objects are recorded. Sources of information taken into account in the examination 1.Patent. England No. 1496897, KJ |. G 01 S 9/02, 1978. 2, USSR Copyright Certificate 270699, cl. G 01 B 9/02, 1974 (prototype).