CN208443479U - A kind of light intensity test device - Google Patents

Abstract

The utility model relates to a light intensity detection device, which comprises a power supply, a photoresistor, a resistance voltage dividing mechanism, a capacitor, a piezoelectric ceramic, a laser emitting and receiving device, and a single-chip microcomputer; The pressure-voltage mechanism is connected in series; the capacitor is connected in parallel with the resistance voltage-dividing mechanism; the piezoelectric ceramic is arranged in the middle of the capacitor; the laser emitting and receiving device is arranged on one end of the capacitor, and its laser detection The transmitting and receiving part is facing the surface of the piezoelectric ceramic; the single chip is electrically connected with the laser transmitting and receiving device. The utility model has the advantages of simple design, portable use, accurate detection and the like.

Description

A light intensity detection device

technical field

The utility model relates to a detection device, in particular to a light intensity detection device.

Background technique

With the development of living standards, more and more people use light, and the fields of light are medical care, lighting and so on. In order to reduce the waste of light resources and the harm of light pollution to life, it is necessary to design a device that can accurately detect the ambient light intensity.

The piezoelectric ceramic in the prior art is a functional ceramic material that can convert mechanical energy and electrical energy into each other. It belongs to inorganic non-metallic materials. A potential difference is formed, and an electric current can be formed through the loop. This effect is called the piezoelectric effect. Piezoelectric ceramics have very sensitive characteristics, and can convert their weak mechanical vibrations into electrical signals. Using the sensitive piezoelectric effect of piezoelectric ceramics, piezoelectric ceramics have been used in sonar systems, meteorological Detection, telemetry environmental protection, household appliances, etc., but in the detection of light intensity, piezoelectric ceramics have not been applied.

In the prior art, photoresistors are widely used to detect the intensity of ambient light. The photoresistors are special resistors made of semiconductor materials such as sulfide spacers or selenide spacers. The working principle is based on the internal photoelectric effect. The photoresistor has the characteristic that its resistance value changes with the intensity of incident light, and the photoresistor is very sensitive to light, and is generally used for light measurement, light control and photoelectric conversion (converting changes in light into changes in electricity) . Currently, piezoelectric ceramics and photoresistors are not used in combination with light intensity detection devices in the prior art.

At present, most of the light detection devices on the market are relatively complicated in design, relatively high in manufacturing cost, and inconvenient to carry and use. Therefore, it is very necessary to design a light intensity detection device with simple design, portable use and accurate detection.

Utility model content

Aiming at the problems existing in the prior art, the utility model designs a light intensity detection device, which is intended to provide a light intensity detection device with the characteristics of simple design, easy portability, and accurate detection.

In order to achieve the above object, the technical scheme provided by the present invention is as follows:

A light intensity detection device, comprising a power supply, a photoresistor, a resistance voltage dividing mechanism, a capacitor, a piezoelectric ceramic, a laser emitting and receiving device, and a single-chip microcomputer; wherein,

The power supply, the photoresistor and the resistance voltage dividing mechanism are connected in series;

the capacitor is connected in parallel with the resistance voltage dividing mechanism;

the piezoelectric ceramic is arranged in the middle of the capacitor;

The laser emitting and receiving device is arranged on one end of the capacitor, and its laser detection emitting and receiving part is facing the surface of the piezoelectric ceramic;

The single chip is electrically connected with the laser transmitting and receiving device.

Further, the device further includes a display screen, and the display screen is electrically connected to the single chip microcomputer.

Further, the resistance voltage dividing mechanism is an indicator light.

Further, the device further includes a switch, and the switch is connected in series with the power supply, the resistance voltage dividing mechanism, and the photoresistor.

Further, the device further includes a casing, and the display screen, the indicator light and the switch are arranged on the surface of the casing.

Further, the outer surfaces of the upper and lower layers of the piezoelectric ceramic are plated with electrodes.

Further, the electrode material is gold, or platinum, or conductive silver paste.

Further, the surface of the electrode is treated with insulation.

Further, the upper outer surface electrodes of the piezoelectric ceramic are flat and smooth, and the lower outer surface electrodes are flat and smooth.

Further, the center line of the transmitting and receiving part of the laser transmitting and receiving device is perpendicular to the outer surface electrode of the upper layer of the piezoelectric ceramic.

Compared with the prior art, the utility model has the following beneficial effects:

The core technical feature of the present utility model is that compared with the existing light intensity detection device, the present utility model has a simpler design and fewer components, so that it is convenient for people to carry and use; Detection is more accurate.

Description of drawings

Fig. 1 is the structural representation of the light intensity detection device of the present utility model:

Among them, the accompanying drawings identify:

1 case 2 power supply

3 wires 4 MCU

5 Display 6 Capacitor

7 Piezoelectric ceramics 8 Laser transmitter and receiver

9 Resistor divider mechanism 10 Photoresistor

11 switch

Detailed ways

The specific embodiments of the present utility model will be described in further detail below with reference to the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

In this embodiment, as shown in FIG. 1, a light intensity detection device includes a power source 2, a photoresistor 10, a resistance voltage dividing mechanism 9, a capacitor 6, a piezoelectric ceramic 7, a laser emitting and receiving device, and MCU 8; of which,

The power supply 2, the photoresistor 10, and the resistance voltage dividing mechanism 9 are connected in series. The power supply 2 is a DC power supply, which can be 1.5V, 5V, or 10V. The photoresistor 10 is a special resistor made of semiconductor materials such as sulfide spacer or selenide spacer, and its working principle is based on the internal photoelectric effect. The stronger the light, the lower the resistance value. With the increase of light intensity, the resistance value decreases rapidly, and the bright resistance value can be as small as 1KΩ or less. The photoresistor 10 is very sensitive to light. When there is no light, it is in a high resistance state, and the dark resistance can generally reach 1.5MΩ. The characteristics of small size, high sensitivity, stable performance and low price of the photoresistor 10 make it widely used, such as automatic brightness adjustment in TV sets, automatic exposure in cameras, and anti-theft alarm devices. In the present invention, when the photoresistor 10 is irradiated by ambient light, its resistance value changes with the intensity of the incident light, so that the current flowing to the capacitor 6 is different. The resistance voltage dividing mechanism 9 may be an indicator light or a resistance.

The capacitor 6 is connected in parallel with the resistance voltage dividing mechanism 9 .

The piezoelectric ceramic 7 is arranged in the middle of the capacitor 6, and the piezoelectric ceramic 7 is an electronic ceramic material with piezoelectric effect. Piezoelectric effect means that when some dielectrics are deformed by external force in a certain direction, polarization will occur inside them, and positive and negative opposite charges will appear on its two opposite surfaces at the same time. When the external force is removed, it will return to an uncharged state, a phenomenon called the positive piezoelectric effect. When the direction of the force changes, so does the polarity of the charge. On the contrary, when an electric field is applied in the polarization direction of the dielectrics, these dielectrics will also deform. After the electric field is removed, the deformation of the dielectrics disappears. This phenomenon is called the inverse piezoelectric effect. The utility model applies the inverse piezoelectric effect, and the electric field of the capacitor 6 exerts different degrees of external force on the piezoelectric ceramics 7, so that the piezoelectric ceramics are deformed to different degrees. When the switch 11 is in the off state, the electric field of the capacitor 6 disappears, the external force applied to the piezoelectric ceramic 7 disappears, the deformation of the piezoelectric ceramic 7 disappears, and the original state is restored. The electrode material of the piezoelectric ceramic 7 is gold, or platinum, or conductive silver paste, and the surface of the electrode is treated with insulation, so that the surface of the electrode is flat, and the laser is easily reflected to improve the accuracy.

The laser emitting and receiving device 8 is arranged on one end of the capacitor, and its laser emitting and receiving part is facing the surface of the piezoelectric ceramic. The laser emitting and receiving device 8 can realize non-contact long-distance measurement by utilizing the characteristics of high directivity, high monochromaticity and high brightness of the laser. When the laser emitting and receiving device 8 is working, the laser emitting diode is aimed at the target to emit laser pulses. After being reflected by the target, the laser light is scattered in all directions, and part of the scattered light returns to the receiver. By receiving the elapsed time, the target distance can be determined. The laser emitting and receiving device 8 measures the time it takes to reach the piezoelectric ceramic 7. The greater the electric field external force received by the piezoelectric ceramic 7 from the capacitor 6, the greater the deformation. longer.

The single-chip microcomputer 4 is electrically connected to the laser transmitting and receiving device 8, and the laser transmitting and receiving device 8 transmits data to the single-chip microcomputer 4, and the single-chip computer 4 performs data processing.

In this embodiment, as shown in FIG. 1 , the device further includes a display screen, and the display screen 5 is connected to the single chip 4 . The single-chip microcomputer 4 processes the data transmitted from the laser emitting and receiving device 8, and outputs it to the display screen 5, and the display screen 5 displays the light intensity.

In this embodiment, as shown in FIG. 1 , the resistance voltage dividing mechanism 9 is an indicator light.

In this embodiment, as shown in FIG. 1 , the device further includes a switch 11 , and the switch 11 is connected in series with the power source 2 , the resistance voltage dividing mechanism 9 , and the photoresistor 10 . The setting of the switch 11 is used to control the on or off of the device, and the switch can be set to the off state when detection is not required.

In this embodiment, as shown in FIG. 1 , the device further includes a casing 1 , and the display screen 5 , the switch 11 , and the indicator light 9 are arranged on the surface of the casing.

In this embodiment, as shown in FIG. 1 , the center line of the transmitting and receiving part of the laser transmitting and receiving device is perpendicular to the upper outer surface electrode of the piezoelectric ceramic 7 .

The core technical feature of the present utility model is that compared with the existing light intensity detection device, the present utility model has a simpler design and fewer components, so that it is convenient for people to carry and use; Detection is more accurate.

The above is the preferred embodiment of the present invention, it should be pointed out that for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can also be made. These improvements and modifications It is also regarded as the protection scope of the present invention.

Claims (10)

1. A light intensity detection device is characterized by comprising a power supply, a photoresistor, a resistance voltage division mechanism, a capacitor, piezoelectric ceramics, a laser transmitting and receiving device and a singlechip; wherein,

the power supply, the photoresistor and the resistance voltage dividing mechanism are connected in series;

the capacitor is connected with the resistance voltage dividing mechanism in parallel;

the piezoelectric ceramic is arranged in the middle of the capacitor;

the laser emitting and receiving device is arranged at one end of the capacitor, and a laser detection emitting and receiving part of the laser emitting and receiving device is opposite to the surface of the piezoelectric ceramic;

the single chip microcomputer is electrically connected with the laser transmitting and receiving device.

2. The light intensity detecting device of claim 1, further comprising a display screen electrically connected to the single-chip microcomputer.

3. The light intensity detecting device according to claim 2, wherein the resistance voltage dividing mechanism is an indicator light.

4. The light intensity detecting device according to claim 3, further comprising a switch connected in series with the power source, the resistor voltage dividing mechanism, and the photo resistor.

5. The light intensity detecting device according to claim 4, further comprising a housing, wherein the display screen, the indicator light and the switch light are disposed on a surface of the housing.

6. The light intensity detecting device according to claim 1, wherein the upper and lower piezoelectric ceramic layers are coated with electrodes on outer surfaces thereof.

7. The light intensity detecting device according to claim 6, wherein the electrode material is gold, platinum, or conductive silver paste.

8. The light intensity detecting device according to claim 6 or 7, wherein the surface of the electrode is subjected to an insulating treatment.

9. The light intensity detecting device according to claim 8, wherein the electrodes on the outer surface of the upper layer of the piezoelectric ceramic are flat and smooth, and the electrodes on the outer surface of the lower layer are flat and smooth.

10. The light intensity detecting device of claim 9, wherein the central line of the emitting and receiving portion of the laser emitting and receiving device is perpendicular to the outer surface electrode of the piezoelectric ceramic upper layer.