CN102520205A - Light refection principle-based velocity measurement sensor - Google Patents

Abstract

The invention discloses a speed measuring sensor based on the principle of light reflection, which comprises a DC power supply VCC, a gear, and a photoelectric pair tube module in which a transmitting tube and a receiving tube are packaged together. The DC power supply VCC is electrically connected to the photoelectric pair tube module. The photoelectric pair tube module is installed on the same side of the gear. The speed measuring sensor based on the light reflection principle of the present invention can overcome the defects of large installation space, complex installation structure, low reliability and high cost in the prior art, so as to realize small volume, small installation space, simple structure, easy installation, and easy Advantages of maintenance, high reliability and low cost.

Description

A speed sensor based on the principle of light reflection

technical field

The invention relates to a sensor, in particular to a speed measuring sensor based on the principle of light reflection.

Background technique

The speed sensor is an instrument that can measure the running speed of the measured object, and the increment of displacement per unit time is the speed. Velocity is a vector with magnitude and direction. The magnitude of velocity is called rate. Velocity includes linear velocity and rotational velocity. Correspondingly, there are sensors for measuring linear velocity and sensors for measuring rotational velocity, which are collectively referred to as speed sensors.

The speed sensor is widely used, it can be used in production equipment, special locomotives, wind power generation, etc. For example, online cutting of plates and pipes, speed measurement of cables or sandpaper, etc.; because they are non-contact measurements, they are very suitable for measuring sensitive or untouchable objects, such as textiles such as flannelette, fur, coated or viscose surfaces, and objects on foam rubber surfaces. Speed measurement; there are also metal processing industries such as measuring the speed of steel, double pumping speed measurement, control of coating process, etc.

Generally, non-contact gear speed sensors can be divided into two categories: magnetic and optical. Among them, the electromagnetic-based speed sensor is based on the change of the magnetic field caused by the rotation of the gear, and uses the Hall element to convert the changing magnetic field into an electrical signal, thereby measuring the speed of the gear. The photoelectric gear sensor slots (or punches) on the gear, and installs photoelectric tubes on both sides of the gear. When the gear rotates, it calculates the speed of the gear according to the change of the electrical signal caused by the light on and off.

Both of these methods require a certain amount of installation space. In places where the space is very narrow, mechanical components need to be added to facilitate installation, but this will increase the cost.

During the process of realizing the present invention, the inventors found that the prior art at least has defects such as large installation space, complicated installation structure, low reliability and high cost.

Contents of the invention

The object of the present invention is to solve the above problems and propose a speed measuring sensor based on the principle of light reflection to achieve the advantages of small size, small installation space, simple structure, easy installation, easy maintenance, high reliability and low cost.

In order to achieve the above object, the technical solution adopted by the present invention is: a speed sensor based on the principle of light reflection, including a DC power supply VCC, a gear, and a photoelectric pair tube module that encapsulates a transmitting tube and a receiving tube, and the DC power supply VCC is electrically connected to the photoelectric pair tube module, and the photoelectric pair tube module is installed on the same side of the gear.

Further, in the photoelectric tube module, the emitting tube includes a light emitting diode LED and a first voltage stabilizing resistor R1; the anode of the light emitting diode LED is connected to the DC power supply VCC through the first voltage stabilizing resistor R1, and the cathode is grounded to GND.

输入端，比较器IC1的输出端为电压信号

输出端。 Further, in the photoelectric pair tube module, the receiving tube includes a phototransistor X2, a second voltage stabilizing resistor R2, a high-frequency noise filter capacitor C1, and a comparator IC1; With the setting, the collector is connected to the DC power supply VCC through the second voltage stabilizing resistor R2, grounded to GND through the high-frequency noise filter capacitor C1, and connected to the non-inverting input terminal of the comparator IC1, and the emitter is grounded to GND; the inverting input terminal of the comparator IC1 is the reference voltage signal

input, the output of comparator IC1 is a voltage signal

output.

Further, the above-mentioned speed sensor based on the principle of light reflection is characterized in that it also includes a signal processing module;

The signal processing module is used to output the voltage signal according to the photoelectric tube module , to perform counting or timing processing to obtain the speed signal of the gear.

Further, the signal processing module is a single-chip microcomputer.

The speed measuring sensor based on the principle of light reflection in each embodiment of the present invention includes a DC power supply VCC, a gear, and a photoelectric paired tube module that encapsulates a transmitting tube and a receiving tube, and the DC power supply VCC is electrically connected to the photoelectric paired tube module. The paired tube module is installed on the same side of the gear; in this way, using the principle of light reflection, the photoelectric paired tube module’s transmitting tube and receiving tube are packaged together and installed on the same side of the gear; when the gear rotates, the gear with teeth and without teeth The luminous flux radiated back from the local area will change, which will cause corresponding changes in the electrical signal of the receiving tube, and the subsequent circuit will obtain the rotational speed information of the gear through the processing of this changed signal; thus it can overcome the large installation space, complex installation structure and reliability in the prior art. Low and high cost defects, in order to achieve the advantages of small size, small installation space, simple structure, easy installation, easy maintenance, high reliability and low cost.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

Description of drawings

The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the description, and are used together with the embodiments of the present invention to explain the present invention, and do not constitute a limitation to the present invention. In the attached picture:

Fig. 1 is a schematic diagram of the electrical principle of a photoelectric tube module in a speed sensor based on the principle of light reflection according to the present invention.

Detailed ways

The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

According to an embodiment of the present invention, a speed sensor based on the principle of light reflection is provided. As shown in Figure 1, this embodiment includes a DC power supply VCC, a gear, and a photoelectric tube module that encapsulates the transmitting tube and the receiving tube together. The DC power supply VCC is electrically connected to the photoelectric tube module, and the photoelectric tube module is installed on the gear. on the same side.

输入端，比较器IC1的输出端为电压信号

输出端。 Wherein, in the above-mentioned photoelectric tube module, the transmitting tube includes a light-emitting diode LED and a first voltage stabilizing resistor R1, and the receiving tube includes a phototransistor X2, a second voltage stabilizing resistor R2, a high-frequency noise filter capacitor C1, and a comparator IC1; The anode of the diode LED is connected to the DC power supply VCC through the first voltage stabilizing resistor R1, and the cathode is grounded to GND; Frequency noise filter capacitor C1 is grounded to GND, connected in parallel to the non-inverting input terminal of comparator IC1, and the emitter is grounded to GND; the inverting input terminal of comparator IC1 is a reference voltage signal

input, the output of comparator IC1 is a voltage signal

output.

，进行计数或计时处理，得到齿轮的转速信号。这里，信号处理模块可以为单片机。 Further, in the above embodiment, the speed sensor based on the principle of light reflection also includes a signal processing module; the signal processing module is used to

, to perform counting or timing processing to obtain the speed signal of the gear. Here, the signal processing module may be a single-chip microcomputer.

，把高频噪音滤波电容C1输出的信号，调理成方波信号（即电压信号

）后，送入单片机进行计数或记时处理，从而得到齿轮的转速信号。 In the speed measuring sensor based on the principle of light reflection in the above embodiment, when working, the light emitted by the light-emitting diode LED is reflected by the gear and received by the phototransistor X1; the phototransistor X1 converts the received luminous flux into a voltage signal, and amplifies and outputs it to the high High-frequency noise filter capacitor C1; high-frequency noise filter capacitor C1 filters out high-frequency noise signals and sends them to the positive terminal of comparator IC1 (ie, the non-inverting input terminal); comparator IC1 according to the voltage reference signal

, adjust the signal output by the high-frequency noise filter capacitor C1 into a square wave signal (that is, a voltage signal

), send it to the single-chip microcomputer for counting or timing processing, so as to obtain the speed signal of the gear.

The speed measuring sensor based on the principle of light reflection in the above embodiment uses the principle of light reflection to package the emitting tube and receiving tube of the photoelectric pair tube module together and install them on the same side of the gear; The luminous flux radiated back from the local area will change, which will cause a corresponding change in the electrical signal of the receiving tube; the subsequent circuit will obtain the gear speed information by processing the changed electrical signal.

Compared with the prior art, the speed measuring sensor based on the principle of light reflection in the above embodiment does not require special treatment of the gears, and can at least achieve the advantages of simple structure, small size, small installation space, easy installation, easy maintenance and low cost.

Finally, it should be noted that: the above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it still The technical solutions recorded in the foregoing embodiments may be modified, or some technical features thereof may be equivalently replaced. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (5)

1. A speed measuring sensor based on light reflection principle, it is characterized in that, comprises DC power supply VCC, gear and the photoelectric pair tube module that transmitting tube and receiving tube are packaged together, described DC power supply VCC and photoelectric pair tube module electric connection, the photoelectric pair tube module is installed on the same side of the gear. 2. The speed measuring sensor based on the principle of light reflection according to claim 1, characterized in that, in the photoelectric pair tube module, the transmitting tube includes a light-emitting diode LED and a first stabilizing resistor R1; The anode is connected to the DC power supply VCC through the first voltage stabilizing resistor R1, and the cathode is grounded to GND. 3. The speed measuring sensor based on the principle of light reflection according to claim 2, characterized in that, in the photoelectric pair tube module, the receiving tube includes a phototransistor X2, a second voltage stabilizing resistor R2, and a high frequency noise filter capacitor C1 and comparator IC1; the base of the photoelectric transistor X1 is set in cooperation with the light-emitting diode LED, and the collector is connected to the DC power supply VCC through the second voltage stabilizing resistor R2, grounded to GND through the high-frequency noise filter capacitor C1, and connected to the comparator IC1 in parallel The non-inverting input terminal of the comparator IC1 is the reference voltage signal

input, the output of comparator IC1 is a voltage signal

output. 4. The speed measuring sensor based on the principle of light reflection according to any one of claims 1-3, further comprising a signal processing module; The signal processing module is used to output the voltage signal according to the photoelectric tube module

, to perform counting or timing processing to obtain the speed signal of the gear. 5. The speed measuring sensor based on the principle of light reflection according to claim 4, wherein the signal processing module is a single-chip microcomputer.