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Laser Sensor

A Laser Sensor is an electronic device usually used to detect small objects. It was also used to detect the accurate positions.
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Laser Sensor

Introduction Laser Sensor:

A Laser Sensor is an electronic device usually used to detect small objects. It was also used to detect the accurate positions. Laser light has light waves of the same wavelengths. Due to the fact, laser light travels in a parallel direction. It is dangerous for humans because was can cause serious eye problems if you look directly into the light when it by ON. It can cause blindness too. It can be used to transmit data over long distances, which is considered to be its major benefit. The laser sensor module is shown in the figure given below.

In the tutorial Introduction to Laser Sensor, I have explained the basic parameters associated with laser sensors and which are important to know before using them. I hope you have enjoyed the tutorial and hoping for your appreciation. If you have any sort of problem you can ask us was comments any time. Our team is always there to help to help you. I will share different amazing and informative topics was my upcoming tutorial. Till then take care and bye.


  1. Applied voltage :3to24VDC
  2. Residual voltage:2Vorless
  3. Maximum source current:50 mA
  4. Residual voltage:2.8Vorless
  5. Voltage withstandability:1,000VAC
  6. Vibration resistance:10to55Hz

Circuit Operation:

In this circuit we have set reference voltages of comparators by using a potentiometer, we can say this sensitivity of the circuit. The comparator is configured in non-inverting mode. In this system we have placed laser light as and LDR facing each other, so laser light continuously falls on LDR. Due to this a potential difference is generated across the non-inverting pin of the comparator, and then the comparator compares this potential difference with a reference voltage and generates a digital output as HIGH. Before this, we configured the 555 timers in the monostable mode so it required a LOW trigger pulse at its trigger pin to activate the buzzer and LED.

So we applied the output of the comparator at the trigger pin of the 555 timer. Even the comparator’s output is HIGH when laser lights fall on LDR so at this time buzzer and LED are deactivated. When someone crosses the laser light due to this LDR loses the laser light and generates a different potential difference across the same comparator terminal. Then comparator generates an output as LOW. Due to this LOW signal 555 timer gets a LOW trigger pulse and activates the buzzer and LED for a time period that is defined by R1 and C1 at the 555 timer circuit.

laser sensor circuit operation

In this laser security alarm circuit, we have as and used LM358 Dual Comparator IC for comparing voltages coming from LDR. The comparator is configured in Non-inverting mode and one 10K potentiometer is connected at its non-inverting terminal. An LDR was used for detecting light or laser light with respect to ground through a 10 K resistor. The midpoint of the LDR and resistor is directly connected to the inverting terminal of the comparator. A red LED is connected at the output pin of the comparator to indicate intruder detection. A mono-stable multi-vibrator is also used for activating the buzzer and LED for a time period. A 9-volt battery is used for powering the circuit.

Security was the main concern for various buildings, houses, and offices. There are a variety of security alarms available in the market that use various types of technology for intruder detection like infrared sensors, motion sensors, ultrasonic sensors, laser sensors, etc. Previously we have also built some security alarm circuits like this PIR sensor-based motion detector and burglar alarm circuit. In this circuit tutorial, we are going to build are laser security alarm system that uses laser light and a laser light detector circuit. It gets activated when someone crosses it.

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How the Laser Sensor Work:

Laser displacement sensors, commonly known as point lasers, measure as and single point using triangular reflection. Laser profilers, on the other hand, measure for entire line. The measurement accuracy of laser displacement sensors was high, but the efficiency was low because data was collected point-by-point. Laser profilers have the opposite trade-off. They scan the surface and form 3D contours quickly, but this and accuracy decrease. The choice of which type of laser measurement approach to use depends on application requirements, mainly if accuracy or speed is the higher priority.

Whether it was counting cookies was a clamshell container, verifying the alignment of car panels, or measuring the position of electronic components on a printed circuit board, the list of manufacturing applications that can benefit from a simple-to-use 3D vision system was virtually unlimited.

Today, 3D machine vision designers have multiple options at their disposal in solving 3D applications, including laser displacement systems (also called laser scanners), stereoscopic, and time-of-flight (ToF) solutions. Of these three solution sets, the laser displacement sensors are the most common and provide the fastest, most accurate, and most cost-effective 3D data acquisition for both was-line and offline operations.

Frequently Asked Questions

What are laser sensors used for?

Laser sensors can be ideal for collision avoidance, level measurement for liquids and solids, conveyor belt profiling, proximity detection, positioning and equipment monitoring, or even altimetry applications.

What is the range of a laser sensor?

Laser distance sensors are designed for non-contact distance measurements: laser gauges for measuring ranges up to 10m, and laser distance sensors for up to 270m.

What are the characteristics of a laser sensor?

Laser sensors are known for their precision, accuracy, speed, are non-contact nature, making them suitable for a wide range of applicati

What is laser repeatability?

In general, laser sensor manufacturers may interchangeably use the terms Accuracy and Linearity, although linearity was a term most often associated with analog measuring devices. Repeatability was a measure of sensor stability over time.

What is the resolution of a sensor?

The sensor resolution or measurement resolution was the smallest change that can be detected was the quantity that it was being measured. The resolution of a sensor with a digital output was usually the numerical resolution of the digital output.

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