Sea Surface Fuel Leakage Design of Data Acquisition Board for Ultraviolet Detectors Xi'an Datai Electronics Co., Ltd. Technical Department Keywords: Fuel Leakage, Ultraviolet Detector, Ultraviolet Sensor, Signal Amplifier, Data Acquisition, Oil Detection First, New UV Detector Ultraviolet (UV) Radiation is radiation with wavelengths between 10 and 400 nanometers. They are classified by wavelength into ultraviolet A, ultraviolet B, ultraviolet C, and vacuum ultraviolet (figure 1). In today's science and technology, the role of UV detectors is becoming more and more important. The demand for UV detectors that are either blind (defining: insensitive to visible light) or sun blind (defining: insensitive to solar spectrum) is also greater. Optically-blind UV detectors have a particularly high sensitivity to UV light, but have very low sensitivity to visible and infrared radiation. For applications on the Earth's surface, the blind detector can provide shorter cutoff wavelengths, so it can only detect shorter wavelengths of UV than solar radiation that can penetrate the atmosphere. Due to the absorption of the ozone layer, the wavelength of solar radiation close to the Earth's surface is above 290 nm. Therefore, UV detectors with a cutoff wavelength of less than 280 nm are collectively referred to as the sun blind type. Optically blind/daily blind UV detectors can be used in industrial equipment, scientific research and consumer markets. These applications include fire detection, flame control, UV astronomy, biological and medical applications, and personal health products.
Second, detecting the spread of fuel If ships on the surface leak fuel, it will seriously pollute the marine ecology. It is very convenient to use light-blind UV detectors to detect the spread of fuel on the sea surface. As the diffusion rate of fuel is amazing, the diffusion range will be doubled within a few minutes. Real-time detection is very important. Therefore, we need a detection device whose function not only detects the occurrence of fuel leakage, but also tells us in real time exactly the extent of fuel diffusion. In other words, we need an ultraviolet camera, an ultraviolet detector with imaging capabilities. The physical concept behind the oil is because the index of refraction of oil is higher than that of water, so the reflectivity of oil to light is greater than that of seawater. The difference is most obvious in the ultraviolet spectrum. Therefore, we can use an artificial ultraviolet generator to emit ultraviolet rays to the surface of the sea. Ultraviolet sensors and high-precision acquisition boards collect the intensity of the ultraviolet radiation signal reflected from the sea surface to detect the fuel leakage and its spread.
Third, the acquisition board technical requirements
Communication interface RS485, baud rate 1200bps, data format 8, N, 1;
Single-channel differential voltage signal input, signal voltage range 0~20mV; signal input connector is connected in parallel with two SMA seats.
Output 1 flash trigger control signal, triode open collector (OC) output;
Output 1 relay alarm output;
Send the start command from the host computer through RS485: set the flash trigger time interval (0~500 milliseconds), delay time (0~60000 milliseconds), and the number of flashes. The acquisition board will start the flash according to the set parameters after receiving this command;
• The inquiry command is sent by the host computer via RS485: the average value of the signal before the flashing is returned, and the peak value of the signal after each flashing of the lamp. The query can be repeated multiple times before the next flash command;
Send command from upper computer through RS485: set alarm value;
Alarm output judgment rules:
When this flash peak value exceeds the alarm value, it starts automatically and tests again to determine the peak value. If both peak values ​​exceed the alarm value, the alarm relay operates.
Resetting the alarm value can release the alarm signal; sending the start command can also release the alarm signal;
Signal amplification factor according to the actual signal, can be fixed by the selected resistor;
Requires signal output without power frequency interference.
Fourth, DTE112 acquisition board Communication command acquisition board to send commands to the host, in order to facilitate debugging in the serial assistant, in the end of each reply command symbol "#", added a carriage return (0x0D) and a line break ( 0x0A).
4.1. Setting parameters The command setting commands start with DT, followed by the address code, then the command code, followed by a colon ":", then the number, and finally the trailing "#".
Note: The setting parameters have a memory function. If you do not modify the parameters, you do not need to set them again. If you do not know the current parameters, you can use the query parameters command.
Set the flash pulse width:
Command code: DTnW:xxx#
Address code n: one character, for example, 0~9, a~z, note is ASCII code.
Parameter range xxx: 5~500, unit mS
Example: The acquisition board address is 2, when the pulse width is set to 150ms, DT2W:150#
After the command is successfully set, the No. 2 acquisition board returns: DT2w:150#
Set the flash pulse interval:
Command code: DTnI:xxxx#
• Set the number of flashes:
Command code: DTnN:xx#
Set the alarm threshold:
Command code: DTnA:xxxx#
Modify the acquisition board address code:
Command code: DTnD:x#
4.2. Work Commands The work commands all start with DT, followed by the address code, then the command code, and finally the end symbol "#".
Start command:
Command code: DTnS#
Example: Host sends start command, DT3S#
The No. 3 acquisition board outputs the flash signal according to the set parameters and performs data acquisition and processing. After the flash is over. No. 3 acquisition board returns:
DT3=:120,2499,1#
Indicates that the background noise is 120mV, the peak value is 2499mV, and 1 indicates the No. 3 acquisition board alarm. If 0# indicates no alarm, the system will execute the start command to reply 2# for the first time. If the alarm flag is found to be 2 during the test, the system will automatically restart.
V. Action of the acquisition board When the acquisition board receives a command to set the flash pulse width, set the flash pulse interval, set the number of flashes, and set the alarm threshold, the acquisition board will return the host command word in lower case and return the command to the host. In the controller, unless next set again.
When the acquisition board receives the start command, it returns the started command first, and then performs the following operations (assuming the number of flashes is set to 3):
Six, acquisition board pictures and wiring
Power outlet: Connect the +12V and -12V DC power supplies.
RS485 socket: Connect the communication cable. If the distance is greater than 200 meters, it is recommended to use twisted pair with a diameter greater than 1 square mm.
Signal input: SMA
Output signal socket: alarm relay normally open contact, flash signal seven, signal picture Record:
Eight, ultraviolet detector picture
Nine, to undertake customized product development Xi'an Datsu Electronic Technology Development Department to undertake data acquisition, wireless measurement and control products such as custom projects. The customization process is:
1. Preliminary communication between technicians of both parties;
2. The detailed technical requirements are drafted by Party A and Party B assists in the completion. 3. Party B drafts a product customization agreement according to technical requirements, including detailed technical indicators, customization cycles, test cycles, prototype numbers, customization fees, and intellectual property rights.
4. After Party A pays the fees according to the terms of the agreement, Party B officially starts product customization.
5. Party B submits prototypes to be tested by Party A.
6. Prototype testing after passing small batch production.
7. After the small batch test is completed, the custom task is completed.
8. Please contact us for technical consultation.
9. Please download "Technology Development Consignment and Same Board" on Tatida's official website.
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