Laser Rangefinder Module 10K2B

 Product description

1.1 Product functions

• Laser ranging function;
• Power on and temperature collection function;
• Distance gating function;
• First/last target ranging function;
• Power supply reverse connection protection function;
• Self-check function;
• Cumulative number of laser pulses function;
• Equipped with serial port update program function;
• It has independent power-on control signal function.

1.2 Product description

The schematic diagram of the LRF10K2B laser range finder product is shown in Figure 1, which mainly consists of the following parts:

• Receiving and transmitting components;
• Control and information processing circuit components.

                                                                                                                                                         Figure 1 Schematic diagram of product composition

1.3 Mechanical and optical interfaces

The overall dimensions of the optical-mechanical interface of the laser rangefinder are shown in Figure 2.

Figure 2 Optical-mechanical interface diagram

1.4 Electrical interface

The host computer uses the J30JZ/XN15TJCAL01 rectangular connector to achieve cross-link testing with the J30JZLN15ZKWA000 socket on the distance measuring machine. The pin definitions of the power supply and communication port of the rangefinder are shown in Table 1.

Table 1 Definition of power supply and communication port pins on the rangefinder side

1.5 Software

1.5.1 Data

The data transmission between the distance measuring machine and the host computer includes the following contents:

uControl commands: including single, 1Hz ranging instructions, 5Hz ranging instructions, query instructions, etc.;

uReturn data: including distance information, ambient temperature, rangefinder status, etc.

The data exchange between the distance measuring machine and the host computer uses RS422, and its characteristics are as follows:

uBaud rate: 38400 (factory)/9600/57600/115200;

uByte structure: low bit first, high bit last;

uByte composition: 1 start bit, 8 data bits, no parity, 1 stop bit.

1.5.2 Information

The control command information format is shown in Table 2.

Table 2: Control command information received by the rangefinder

The data sent back by the distance measuring machine is divided into regular data and self-test data.

uGeneral data: including target number, measurement distance, rangefinder status, etc. See Table 3 and Table 4 for details;

uQuery data: including ambient temperature, rangefinder status, etc. See Table 5 for details.

Table 3: Conventional data returned by the distance measuring machine

Table 4 Status word meaning

Table 5: Query data returned by the distance measuring machine

Product performance indicators

Table 6 List of capability indicators

2.1 Working band

When the laser rangefinder is working, the ranging laser is in the 1535nm ± 10nm band. The laser beam is invisible to the naked eye and is in the human eye-safe band. ERDI TECH still recommends that you avoid looking directly at the rangefinder laser when the laser rangefinder is working to avoid unnecessary personal injury.

2.2 Ranging capability

In an environment with visibility ≥15Km and relative humidity ≤60%, when testing a target plate (or other equivalent target) with a size of 2.3m×4.6m and a reflectance of 0.3, the laser rangefinder’s ranging capability can reach more than 10,500m. And the accuracy rate is greater than 98%, which is also a key indicator to judge whether the laser range finder is qualified. Figure 3 shows the relationship between laser rangefinder range and visibility under theoretical conditions.

Figure 3 The relationship between laser rangefinder range and visibility

Factors such as target reflectivity and measurement angle will affect the ranging capability. Generally, the higher the target reflectivity, the better the ranging ability; the more vertical the laser angle is when it irradiates the measurement target reflective surface, the better the ranging ability. In practical applications, the laser rangefinder should illuminate the target surface vertically as much as possible. For targets with medium and high reflectivity, such as traffic signs and other targets, the laser rangefinder's performance can also be better. However, for targets that are difficult to form diffuse reflection, such as water surfaces, the laser rangefinder may not be able to accurately measure (for water surface measurement needs, our company has relevant models to meet, please inquire).

2.3 Ranging blind area

For targets within 50m, the laser rangefinder may not be able to accurately measure, which is its ranging blind spot. It is not recommended that users test targets in the blind zone of the laser range finder, because the laser range finder has strong echoes from targets in the blind zone, which may cause the laser range finder's detector life to be reduced or the ranging capability to be reduced, especially Testing high-reflectivity targets in the blind zone may even cause permanent damage to the detector. Therefore, when the laser rangefinder is under close working conditions such as debugging, please block the receiving lens.

2.4 Distance measurement accuracy

For targets with an accuracy rate of ≥98%, the average accuracy error of the laser rangefinder can reach within 1m. For example, for a target with an actual distance of 1000m, the measurement value of the laser rangefinder will be within 999m and 1001m.

2.5 Accuracy rate

The accuracy rate of the laser rangefinder is greater than 98%.

2.6 Distance resolution

The minimum resolution distance between the front and rear targets measured by the laser rangefinder is ≤40m.

2.7 Ranging frequency

The laser rangefinder can achieve single ranging, 1Hz ranging, and 5Hz different frequency requirements by sending different instructions. See 3.2.3 for the corresponding ranging instructions and operating instructions.

2.8 Product weight

The total weight of the laser rangefinder is ≤230g.

2.9 Dimensions

95mm×60.5mm×71.5mm is the maximum size of the laser rangefinder. Please refer to Figure 2 for the schematic diagram of the overall dimensions.

2.10 Power supply voltage

The power supply voltage of the laser rangefinder ranges from 18V to 36V.

2.11 Power consumption

The standby power consumption of the laser rangefinder is ≤1.8W, and the average power consumption is ≤4W. Different working conditions will have a certain impact on the power. Try to keep the laser rangefinder in a safe working environment.

2.12 Environmental adaptability

The laser rangefinder can operate normally under the conditions of -40℃～+60℃, and the recommended storage temperature is -55℃～+70℃. It is recommended that the laser rangefinder be operated or stored in a normal temperature and dry environment. Too high or too low temperature may cause the decline of certain index capabilities of the laser rangefinder. In particular, avoid using the laser rangefinder when the temperature changes drastically. If used in an environment, this may reduce the service life of the laser rangefinder or cause malfunction. The laser rangefinder was designed with possible temperature shocks in mind, but our company does not guarantee the performance under these conditions.

Function and operation

3.1 Function description

3.1.1 Laser ranging function

Normal working mode

In normal working mode, the laser rangefinder enters the command-receiving preparation state. In this state:

After receiving the ranging command, the distance information is sent back through the serial port after completing the ranging.

Software interface description

After connecting and turning on the power according to the 1.4 interface requirements, the laser rangefinder automatically enters the command-receiving preparation state. In this state, all commands can be received by the main controller through RS422.

Communication characteristics

The data exchange between the laser rangefinder and the host computer adopts RS422 communication. Its characteristics are as follows:

• Baud rate: 38400 (factory)/9600/57600/115200;
• Byte structure: low bit first, high bit last;
• Byte composition: 1 start bit, 8 data bits, no parity, 1 stop bit.

Control information received by laser rangefinder

After the laser rangefinder is powered on, it is in a ready state to receive instructions. By sending a ranging instruction through the serial port, the distance measurement can be initiated. The specific format is shown in Table 2.

3.1.2 Power on, temperature collection function and self-test function

The self-test function is for the laser rangefinder to detect the current rangefinder status and collect the ambient temperature;

The specific operations are as follows:

a. Send the "self-test" command to the laser rangefinder (see Table 2);

b. The laser rangefinder starts self-test and sends back the current ambient temperature, working status and other information (see Table 5).

3.1.3 First and last target ranging and distance gating

First and last target ranging means that the distance information of up to two targets with different distances can be obtained in one ranging;

Distance gating means setting a gating distance (in hexadecimal notation) within the range of the ranging capability. Target distance information lower than the gating value will not be sent back, and the distance measurement value higher than the gating within the range range is valid. ranging;

If you need to set it, the operation method is as follows:

a. Send the "Gating Value Setting" command to the laser rangefinder (see Table 2);

b. Send the "ranging" command to the laser range finder (see Table 2), the laser range finder measures the distance and determines whether the return distance value is greater than the distance gate value and reports the ranging results (see Table 3);

c. Send the "stop ranging" command (see Table 2) to stop ranging. The stop command needs to be sent only in the continuous ranging state.

If you do not need to use the distance gating function, you need to manually restore the initial settings (the gating value is set to 0).

3.1.4 Baud rate setting

Baud rate setting operation method:

a. Send the "0x55 0xF6 0x00 0x60 0x96 0xXX" command to the laser rangefinder (see Table 2), that is, set the baud rate to 9600bps; the rangefinder returns "CC 01 19 00 01 00 00 00 60 00 00 00 00 79 55", "0x00 0x60" means that the current baud rate has been set to 9600bps;

b. Send the "0x55 0xF6 0x01 0x80 0x77 0xXX" command to the laser rangefinder (see Table 2), that is, set the baud rate to 38400bps; the rangefinder returns "CC 01 19 00 01 00 00 01 80 00 00 00 00 98 55", "0x01 0x80" means that the current baud rate has been set to 38400bps;

c. Send the "0x55 0xF6 0x02 0x40 0xB4 0xXX" command to the laser rangefinder (see Table 2), that is, set the baud rate to 57600bps; the rangefinder returns "CC 01 19 00 01 00 00 02 40 00 00 00 00 5B 55", "0x02 0x40" means that the current baud rate has been set to 57600bps;

d. Send the "0x55 0xF6 0x04 0x80 0x72 0xXX" command to the laser rangefinder (see Table 2), that is, set the baud rate to 115200bps; the rangefinder returns "CC 01 19 00 01 00 00 04 80 00 00 00 00 9D 55", "0x04 0x80" means that the current baud rate has been set to 115200bps.

3.2 Operation steps

3.2.1 Power on operation

• Before starting up, according to the interface requirements of 1.4, connect the laser range finder, debugging cable, DC power supply and host computer as shown in Figure 4 (pay attention to the connector direction);
• Turn on the power supply to start.

                                                                                                                        Figure 4 Connection diagram

3.2.2 Shutdown operation

• Before shutting down, make sure that the working processes and tasks of each product are in the end state (after the single ranging information is returned or the continuous ranging is stopped);
• After completing the confirmation, disconnect the power and shut down normally.

3.2.3 Laser ranging function operation

• Send the "single ranging" command to the laser range finder (see Table 2); the laser range finder performs a single range measurement and reports the ranging status and distance value (see Table 3);
• Send the "1Hz ranging" command to the laser range finder (see Table 2). The laser range finder performs ranging once every second and reports the ranging status and distance value (see Table 3);
• Send the “stop ranging” command (see Table 2) to stop ranging;
• Send the "5Hz ranging" command to the laser range finder (see Table 2). The laser range finder performs ranging five times per second and reports the ranging status and distance value (see Table 3);
• Send the “stop ranging” command (see Table 2) to stop ranging.

Maintenance instructions

4.1 Packing list

The list of items provided with the product is shown in Table 8 (if there are other optional items, they may not be reflected in the list, please refer to the actual product).

                                                                                                                                   Table 7 List of accessories

4.2 Precautions for use

• Although this rangefinder uses a human eye-safe band, it is still recommended to avoid direct gaze with human eyes. If necessary, please observe under the protection of relevant professional equipment to avoid damage to human eyes;
• It is forbidden to touch the optical lenses directly with fingers or hard objects. Do not use detergent to clean the lenses unless necessary to prevent irreversible damage to the lens coating layer and affect product performance. If there is dirt on the exposed lens, just wipe it gently with a lens cloth. ;
• Do not use this product under direct sunlight. It is prohibited to store this product in highly polluted environments or outside the storage temperature range to avoid uncontrollable effects on the rangefinder;
• When the rangefinder is under close working conditions such as debugging, please block the receiving lens, otherwise excessive echo may cause permanent damage to the detector;
• This rangefinder adopts a certain degree of air-tight measures, but it is still recommended to use the product in an environment with an ambient humidity of less than 80%, and ensure that the use environment is clean and hygienic to increase the service life of the product;
• When taking the product, please pay attention to eliminate static electricity on the human body to prevent damage to circuit components.

4.2.1 Cleaning of optical components

l Dust particles should be blown off using an air blower;

l Fingerprints should be wiped with absorbent cotton dipped in a small amount of alcohol-ether mixture, and then wiped clean with a clean lens cleaning cloth.

4.2.2 Cleaning of structural parts and electronic devices

l When the power is off, lightly wipe the structural parts and electronic devices with alcohol and let them dry naturally before use;

l Keep the rangefinder, plugs and cables as far away from moisture and dirt as possible;

l Dry the equipment thoroughly before packaging.

4.3 Inspection and maintenance

4.3.1 General inspection

Visual and power-on inspections should be performed after the product is used for the first time and after the resource module is replaced. For products in normal use, only perform power-on inspection before use.

The steps for visual inspection are as follows:

• Check whether the appearance of the product is normal;
• Check whether the cable connection is correct and the connection should be firm.

The power-on inspection steps are as follows:

• Complete the boot operation;
• Start the self-test test product;
• After the inspection, complete the shutdown operation.

4.3.2 Regular maintenance

The laser rangefinder does not require maintenance under normal working conditions. Maintenance is required when stored in a dust-free environment for more than one year, which mainly includes general inspection and power-on inspection.

The product is generally inspected when it is not powered. The steps are as follows:

• All marks and numbers on products and test cable plugs (sockets) should be correct and clear;
• Various screws on the panel should be tightened;
• It should be ensured that the optical glass of the product does not have light spots, pitting, water spots, mold, fingerprints, dust particles and other attachments and cracks that hinder normal observation.

Perform comprehensive inspection and maintenance on the laser rangefinder when it is powered on, including:

• Turn on the power of the products in sequence;
• Complete the boot operation;
• Start product self-test to test the product and complete product self-test;
• Complete the shutdown operation.

4.4 Packaging, transportation and storage requirements

4.4.1 Packaging

When unsealed products need to be restocked, they should be packed in the original packaging. When the product needs to be returned to the factory, the original packaging should be used as much as possible. When using other forms of packaging, it should not cause product performance degradation or damage.

4.4.2 Transportation

Repackaged products can be transported by cars, trains, planes, ships, etc. During transportation, the packages should be fixed on the transportation vehicle to avoid impacts, rough handling, and rain and snow. Road transportation and railway transportation environment refer to GJB 150.16A-2009.

4.4.3 Storage

Repackaged products must not be stored in the open air. The recommended storage environment is: a warehouse with a temperature of 0°C to 30°C, a relative humidity of no more than 70%, no erosion by corrosive substances, no strong mechanical vibration and impact, and no strong magnetic field.

Light window selection and coating suggestions

5.1 Material recommendations

It is recommended to use optical glass H-K9L as the light window material. H-K9L is the most common colorless optical glass, suitable for the laser range of 300nm to 2100nm, with high cost performance and superior physical properties.

5.2 Processing suggestions

The wedge angle tolerance of the light window should be as small as possible, and the wedge angle tolerance is recommended to be ≤3′ (tolerance level ≤7);

The optical surface of the light window should be as smooth as possible, and the recommended arithmetic mean deviation (Ra) of the profile is 0.012.

5.3 Coating recommendations

It is recommended that the light window of the 1535nm laser rangefinder be coated with 1525nm ~ 1545nm anti-reflection coating, with a transmittance of ≥99%;

According to the specific use environment of the product, you can choose other protective films such as hydrophobic film or hard film on the surface of the light window. The other indicators refer to GJB2485-95, and the transmittance is ≥97%.

5.4 Light window appearance and usage suggestions

The effective diameter of the light window depends on different products. Its overall dimensions should ensure that the effective diameter of the light window - the diameter of the light window is ≥ 2mm, and the outer diameter of the rangefinder antenna - the projection size of the effective diameter of the light window is ≥ 1.5mm. The schematic diagram is shown in the figure below. Since the light window has a certain absorption of laser light, it is recommended that the thickness of the light window itself be controlled within 2 to 4 mm according to the overall dimensions.

Due to the high transmittance of the light window, it is recommended that the axis deviation between the emission optical axis and the normal line of the light window be controlled within 0° to 2°. The position diagram of the light window and the two lens barrels is shown in the figure below. At the same time, the air gap between the light window and the rangefinder should be as small as possible. Figure 6 is a schematic diagram of the two ways of placing the light window.

                                                                                                                               Figure 6 Schematic diagram of the appearance, size and placement of light windows in two ways

After-sales service

When a laser rangefinder fails, it needs to be returned to the factory for fault analysis, location and repair. The items that ERDI TECH can repair include but are not limited to the following:

• Optical system;
• Laser emission module;
• Laser receiving module;
• Circuit components.

ERDI TECH provides one-year warranty service and lifetime technical support from the date of delivery of this product. During the warranty period, Dingyang Optoelectronics can replace or repair it for free if it is caused by the quality of the product itself. If there is any product problem caused by the user's human error, our company will The cost of repairing and replacing accessories will be charged based on the actual situation; since the laser rangefinder is a precision optical instrument, please pay attention to protecting the product during use. If you have other use and maintenance problems, you can communicate with our after-sales personnel at any time.