CN104459816A - Device and method for increasing detection distance of reflection type optocoupler - Google Patents

Abstract

The invention relates to a device and method for increasing the detection distance of a reflective optocoupler, wherein the device includes a signal generating module for generating a waveform signal with a frequency f; a reflective optocoupler emits a signal driven by the signal generating module The light whose intensity change frequency is f receives the light reflected by the detected object and converts it into an electrical signal; the frequency selection amplifier module is used to filter and amplify the electrical signal of the reflective optocoupler, and screen out the light with the frequency f Signal: The detection module is used to detect the signal after the frequency selection amplifier module; the comparator module is used to compare the signal after the detection module with the set comparison level signal, and output the corresponding voltage according to the comparison result. Level signal to judge whether the detection object is detected. Compared with the prior art, the invention has the advantages of effectively improving the detection distance of the existing reflective optocoupler, strong anti-interference ability and the like.

Description

A device and method for improving the detection distance of reflective optocoupler

technical field

The invention relates to the technical field of reflective optocouplers, in particular to a device and method for improving the detection distance of reflective optocouplers.

Background technique

The reflective optocoupler is to install the infrared light emitting tube and the silicon photosensitive transistor on the bracket in the same direction. Through, so that there is a certain large current output to detect the presence or absence of objects. The traditional reflective optocoupler detection method is to use a stable direct current to supply power to the transmitter of the reflective optocoupler and make the transmitter emit a certain intensity of infrared signals, and receive sufficient intensity of infrared signals through the receiver to form electrical signals to change The level of the peripheral module. In the process of infrared signal propagation, due to the interference of factors such as distance, the material of the measured object and some other light, the effective distance of the reflective optocoupler to detect the object is relatively short or misjudgment, which sometimes greatly limits its performance in engineering. design.

Contents of the invention

The purpose of the present invention is to provide a device and method for increasing the detection distance of reflective optocouplers in order to overcome the above-mentioned defects in the prior art, which can effectively improve the detection distance of existing reflective optocouplers and has strong anti-interference ability.

The purpose of the present invention can be achieved through the following technical solutions:

A device for increasing the detection distance of a reflective optocoupler, comprising:

A signal generation module, used to generate a waveform signal with a frequency of f;

The reflective optocoupler emits the light with intensity change frequency f driven by the signal generation module, receives the light reflected back after the detected object, and converts it into an electrical signal;

A frequency-selective amplification module is used to filter and amplify the electrical signal of the reflective optocoupler to filter out a signal with a frequency of f;

The detection module is used to detect the signal after passing through the frequency selection amplification module;

The comparator module is used to compare the signal after passing through the detection module with the set comparison level signal, output a corresponding level signal according to the comparison result, and judge whether the detection object is detected.

The reflective optocoupler includes a transmitting end for emitting light and a receiving end for receiving reflected light.

The frequency selection amplifying module adopts a non-sequential manner when filtering and amplifying the electric signal.

A method for increasing the detection distance of a reflective optocoupler, comprising the following steps:

a. A waveform signal with a frequency of f drives the reflective optocoupler to emit light with an intensity change frequency of f;

b. The reflective optocoupler receives the light reflected back from the detected object and converts it into an electrical signal, filters and amplifies the electrical signal, and filters out the signal with frequency f;

c, detecting the signal obtained in step b;

d. Compare the detected signal with the set comparison level signal, and judge whether the detection object is detected according to the comparison result.

In step b, the electrical signals are filtered and amplified in no particular order.

Compared with the prior art, the present invention has the following beneficial effects:

1. The present invention filters, amplifies, detects and compares the electrical signal of the reflective optocoupler to determine whether the detected object exists. Under the same reflective optocoupler, the effective distance of the detected object can be significantly improved by the present invention.

Generally, reflective optocouplers are driven by direct current to emit light, but the present invention uses alternating current with a frequency of f to drive (driven by a waveform signal with a frequency of f generated by a signal generating module), and the emitted light intensity Having a certain frequency can distinguish other light of the same wavelength, so as to prevent the interference of other light of the same wavelength and increase the detection distance.

2. The present invention judges whether the frequency of the received signal is the specific frequency f emitted by the reflective optocoupler transmitter, thereby avoiding the interference of light in the same band and having strong anti-interference.

Description of drawings

Fig. 1 is a structural schematic diagram of the device of the present invention.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

As shown in Figure 1, this embodiment provides a device for increasing the detection distance of a reflective optocoupler, including a signal generating module 1, a reflective optocoupler 2, a frequency-selective amplifier module 3, a wave detection module 4 and a comparator module 5. The generating module 1 is used to generate a waveform signal with a frequency of f; the reflective optocoupler 2 emits light with an intensity change frequency of f driven by the signal generating module, receives the light reflected back after the detected object, and converts it into an electrical signal, The reflective optocoupler 2 includes a transmitting end 2-1 for emitting light and a receiving end 2-2 for receiving reflected light; the frequency-selective amplifying module 3 is used to transmit the electrical signals of the reflective optocoupler in no particular order Filter and amplify to filter out the signal with frequency f; the detection module 4 is used to detect the signal after the frequency selection amplification module; the comparator module 5 is used to compare the signal after the detection module with the set comparison level signal Make a comparison, output a corresponding level signal according to the comparison result, and judge whether the detection object is detected.

For example: the level after detection is 3v, and the comparison value set by the comparator module is 2v. If 3v is higher than 2v, the comparator will output the corresponding level signal (for example, 3.3v means detected, 0v means not detected) to indicate Whether an object is detected.

This embodiment also provides a method for increasing the detection distance of a reflective optocoupler, including the following steps:

a. A waveform signal with a frequency of f drives the reflective optocoupler to emit light with an intensity change frequency of f;

b. The reflective optocoupler receives the light reflected back from the detected object and converts it into an electrical signal, filters and amplifies the electrical signal in no particular order, and screens out the signal with frequency f;

c, detecting the signal obtained in step b;

d. Compare the detected signal with the set comparison level signal, and judge whether the detection object is detected according to the comparison result.

Claims (5)

1. A device for improving the detection distance of reflective optocoupler, characterized in that, comprising: A signal generation module, used to generate a waveform signal with a frequency of f; The reflective optocoupler emits the light with intensity change frequency f driven by the signal generation module, receives the light reflected back after the detected object, and converts it into an electrical signal; A frequency-selective amplification module is used to filter and amplify the electrical signal of the reflective optocoupler to filter out a signal with a frequency of f; The detection module is used to detect the signal after passing through the frequency selection amplification module; The comparator module is used to compare the signal after passing through the detection module with the set comparison level signal, output a corresponding level signal according to the comparison result, and judge whether the detection object is detected. 2 . The device for increasing the detection distance of a reflective optocoupler according to claim 1 , wherein the reflective optocoupler comprises a transmitting end for emitting light and a receiving end for receiving reflected light. 3 . The device for increasing the detection distance of a reflective optocoupler according to claim 1 , wherein the frequency-selective amplifying module adopts a non-sequential manner when filtering and amplifying electrical signals. 4 . 4. A method for improving the detection distance of reflective optocouplers, comprising the following steps: a. A waveform signal with a frequency of f drives the reflective optocoupler to emit light with an intensity change frequency of f; b. The reflective optocoupler receives the light reflected back from the detected object and converts it into an electrical signal, filters and amplifies the electrical signal, and filters out the signal with frequency f; c, detecting the signal obtained in step b; d. Compare the detected signal with the set comparison level signal, and judge whether the detection object is detected according to the comparison result. 5 . The method for increasing the detection distance of a reflective optocoupler according to claim 4 , wherein, in step b, the electrical signals are filtered and amplified in no particular order.