Opto-electronic device for measuring the dimensions of the heated products

 

(57) Abstract:

The invention relates to measurement devices, namely, devices for measuring the geometric dimensions of the heated products, and can be used when the control bars, forgings and rings. The aim of the invention is to simplify the design. The device comprises a lens 2, the vibration of the scanner 3, the photodetector 5, connected to the amplifier 6 of the photocurrent, which is connected to the trigger 7 Schmitt and the indicator 8. The photocurrent amplifier 6 is connected block automatic gain control, consisting of a nonlinear element with a peak detector 9 and the transistor amplifier 10, and the block of automatic stabilization of the noise level, consisting of a peak detector 11 and the amplifier 12. 2 Il.

The invention relates to measurement devices, namely, devices for measuring geometrical parameters of heated products, and can be used in the measurement and control bars, forgings and rings.

Known adaptive optoelectronic error correcting device whose settings are automatically changed depending on the incoming information from the external environment and from the device itself [1]. One of such devices steelton. In this device controllable aperture adjusts the luminous flux received at the photodetector and thereby increases the reliability of the device.

However, this device is applicable to problems of pattern recognition and use it to improve the reliability of measurement systems in engineering is not possible.

The closest in technical essence is the opto-electronic measuring device [2], which contains vibrating scanner, the photodetector, the photocurrent amplifier, Schmitt trigger, filter low frequency, indicator, unit automatic gain control, made in the form of a series circuit of the peak detector, a differential amplifier connected to the photodetector with the load resistor, and the block of automatic stabilization of the level of noise made in the form of an RC circuit connecting the voltage divider connected to the amplifier output of the photocurrent, with the inverting input of the amplifier, and two keys, one of which is connected to the output of the photocurrent amplifier and the inverting input of the amplifier of the photocurrent, and the other parallel to the input resistor of the divider, and the control inputs of the keys connected to the power supply through a Schmitt trigger and two standby m is the complexity of the design, consequently, operation, and adjustment, since this device contains two timing devices (adenoviridae) and two keys. When changing the parameters of the one-shot, and hence their times of operation of the measuring device may be unusable. In addition, the block automatic gain control controls the supply voltage of the photodetector, which defines only one mode of operation of the photodetector, and therefore, for example, may not be used in the generator mode of operation of the photodiode, wherein the photodiode has a maximum signal-to-noise ratio, and pyroelectric detectors operating in the infrared region of the spectrum.

The aim of the invention is to simplify the design of the device.

This is achieved by the fact that in optoelectronic device for measuring the heated products containing vibrating scanner, a sensor, block automatic gain control, Schmitt trigger, indicator and unit of automatic stabilization of the noise level, block automatic gain control is executed in the form connected to the amplifier output photocurrent series circuit of the nonlinear element, the peak detector and transistor rofl noises made in the form connected to the amplifier output photocurrent series circuit of the peak detector, connected to a common point to the positive power bus, and the amplifier is connected through a resistor to the input of amplifier photocurrent.

The specified difference allows to considerably simplify the design, operation and adjustment of the measuring device, because it does not ramasadaya and switching elements. In the proposed device can be used with all existing photovoltaic receivers of information. In addition, the device uses the entire field of view.

In Fig. 1 presents a diagram of the device of Fig. 2 - time pulse diagram explaining his work.

Opposite the heated product 1 has an optical-mechanical device node, consisting of a lens 2, the vibration of the scanner 3, which represents an oscillating mirror, electric generator 4, which is the energy source of oscillations, and the photodetector with a slit aperture 5 installed in the image plane of the lens. The photodetector 5 is connected through the load resistor Rnamplifier 6 photocurrent is made on the basis of the operational amplifier. The resistor R1together with the resistor R2form a voltage divider, which determines the ratios are the analog indicator 8, which also performs the function of a filter of low frequencies. The photocurrent amplifier covered by block automatic gain control (AGC), providing stabilization of the amplitude of the voltage pulses at the output of the amplifier. The AGC block contains a peak detector with a non-linear element 9, the amplifier field effect transistor 10 connected in parallel with the resistor R2. The non-linear element, in this case, the diode performs not only the function of the valve, but also master element, because the current-voltage characteristic has a horizontal initial part, which determines the magnitude of the predetermined voltage.

In addition, the photocurrent amplifier covered by the block of automatic stabilization of the noise level, consisting of a peak detector 11 connected to a common point to the positive bus of the power supply (or "grounded" to the positive power bus), amplifier 12 is connected through a current limiting resistor R to the input of amplifier photocurrent.

The device operates as follows. The mirror scanner 3 makes use of the oscillation generator 4, and the image of the boundary of the product 1 produced by the lens 2, the reciprocating motion relative to the photodetector 5 with a slit dearl, which is then amplified by the power amplifier of the photocurrent (figure 13 in Fig. 2) and is converted by the Schmitt trigger 7 in rectangular pulses (chart 14 in Fig. 2), the length of which is proportional to the position of the product relative to the optical axis of the lens. Then the signal from the Schmitt trigger 7 is fed to the dial indicator 8, which allocates the DC component of the signal is proportional to the length, and hence the deviation in size, and its registers.

When the temperature of the product is changed, the amplitude of the pulses at the amplifier output photocurrent U1(chart 13 in Fig. 2), is modified accordingly, and the voltage difference between the pulse amplitude and drop the non-linear element, which in turn is converted RC-circuit peak detector 9 in the constant voltage U1. The change in the voltage at the output of the peak detector operates by using a transistor amplifier 10 gain photocurrent amplifier 6 through the bypass resistor R2, so that the amplitude of the pulse at the amplifier output photocurrent 6 remained constant.

With the increase of the dark current of the photodetector 5 is increased permanent sostavlyajushie detector 11, which "eliminates failures" of the pulse relative to the positive supply voltage, i.e., converts the pulses into a DC voltage U2regarding Unand the voltage Un-U2with respect to the zero point.

The voltage Un-U2amplified by the amplifier 12 and through a current limiting resistor R is fed to the amplifier input photocurrent and thus compensated for dark current PV 5. The amplifier 12 performs the device function element of comparison, in this case zero.

With the introduction of optical-electronic devices for measuring the size of the heated products increases the reliability of technological equipment for the production of large parts, while improving the reliability of equipment increases the productivity of manufacturing himnefteprom, as well as improve the operational characteristics of the apparatus.

OPTO-ELECTRONIC DEVICE FOR measuring the DIMENSIONS of the HEATED PRODUCTS containing vibrating scanner, the photodetector, the photocurrent amplifier, block automatic gain control, Schmitt trigger, indicator and unit of automatic stabilization of the noise level, characterized in that order from the La photocurrent series circuit of a non-linear element, peak detector and a transistor amplifier connected in parallel to the resistor of the amplifier of the photocurrent, and the block of automatic stabilization of the level of noise made in the form connected to the amplifier output photocurrent series circuit of the peak detector, connected to a common point to the positive power bus, and the amplifier is connected through a resistor to the input of the amplifier of the photocurrent.

 

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