Adjustable gamma signal generator

Abstract

The utility model discloses an adjustable gamma signal generator which comprises a power supply module, a signal generation module and a signal monitoring module. The power supply module is used for converting the + 25V voltage output by the directional probe into a + 5V direct current constant voltage source and converting the + 5V direct current constant voltage source into a + 3.3 V direct current constant voltage source; the + 5V direct-current constant-voltage source supplies power to the signal generation module, and the + 3.3 V direct-current constant-voltage source supplies power to the signal monitoring module; the signal generation module is used for generating an adjustable gamma analog signal and adjusting the frequency, the pulse width and the amplitude of the gamma analog signal; and the signal monitoring module is used for displaying the frequency, the pulse width and the amplitude of the gamma analog signal. The gamma signal acquisition capability of the directional exploring tube can be comprehensively evaluated in a short time by accurately adjusting signal parameters, so that the test period can be greatly shortened, the working efficiency of geological exploration is improved, and the technical defects of singleness and nonadjustability of gamma signal analog output in the current directional exploring tube test are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of directional probe testing, and particularly relates to an adjustable gamma signal generator. Background Art

[0002] In the fields of geological exploration, mineral resource detection, etc., the directional probe is an indispensable and important tool, and its performance directly affects the accuracy and efficiency of exploration. An important function of the directional probe is to collect gamma signals. By analyzing the gamma signals, the radioactive characteristics of underground rock formations can be understood, and then the distribution of mineral resources can be inferred.

[0003] However, there are many deficiencies in the current test methods for the gamma signal acquisition ability of directional probes. The traditional test method usually provides gamma signals to the directional probe through a gamma probe to test the gamma signal acquisition ability of the directional probe. This method can only test the counting ability of the directional probe for gamma signals, and cannot comprehensively evaluate its acquisition ability for gamma signals with different pulse widths and different signal amplitudes, which to a certain extent limits the accuracy and comprehensiveness of the test results.

[0004] In addition, another commonly used test method is to use a pulse generator to simulate gamma signals to test the signal acquisition ability of the directional probe. However, the signal pulse width, amplitude, and frequency adjustment ranges of traditional pulse generators are usually large, which increases the risk of misoperation. During the operation process, once the settings are improper, it is easy to damage the circuit board of the directional probe, thereby affecting its normal use.

[0005] The Chinese invention patent application (application number 2022105455309) discloses a gamma logging tool, including a gamma signal detection circuit, a voltage dividing resistor, a thermistor, a potentiometer, a comparator, and a counter. The gamma signal detection circuit collects gamma rays to obtain gamma signals. The resistance value of the thermistor is positively correlated with the temperature. When the working environment temperature of the gamma logging tool increases, the resistance value of the thermistor increases with the increase of the temperature, thereby realizing the automatic adjustment of the reference threshold voltage value at the reverse input end of the comparator, so as to achieve the purpose of temperature compensation. The comparator outputs gamma pulse signals according to the comparison result of the voltage value of the gamma signal and the reference threshold voltage value, and the counter counts the gamma pulse signals to obtain the gamma count rate, and the logging accuracy is higher. But it can only test the counting ability of the directional probe for gamma signals, and cannot comprehensively evaluate its acquisition ability for gamma signals with different pulse widths and different signal amplitudes. Summary of the Invention

[0006] The purpose of the utility model is to solve the above technical problems, and provide a gamma signal generator with adjustable multi-parameters, which solves the technical defects of the singularity and non-adjustability of the gamma signal analog output in the current directional probe testing.

[0007] To achieve the above object, the utility model provides an adjustable gamma signal generator, which includes a power supply module, a signal generation module, and a signal monitoring module;

[0008] The power supply module is used to convert the +25V voltage output by the directional probe into a +5V DC constant voltage source, and convert the +5V DC constant voltage source into a +3.3V DC constant voltage source; the +5V DC constant voltage source supplies power to the signal generation module, and the +3.3V DC constant voltage source supplies power to the signal monitoring module;

[0009] The signal generation module is used to generate an adjustable gamma analog signal, and adjust the frequency, pulse width, and amplitude of the gamma analog signal;

[0010] The signal monitoring module is used to display the frequency, pulse width, and amplitude of the gamma analog signal.

[0011] Further, the power supply module includes a diode D1, a diode D3, a low dropout voltage regulator chip U1, a low voltage linear regulator U2, and a magnetic bead Z1; the anode of the diode D1 is connected to the +25V DC power supply provided by the directional probe, and the cathode is connected to the Vin of the low dropout voltage regulator chip U1. The Vout of the low dropout voltage regulator chip U1 is connected to the +5V DC power supply input terminal of the magnetic bead Z1; the +5V DC power supply output terminal of the magnetic bead Z1 is connected to the anode of the diode D3, and the cathode of the diode D3 is connected to the Vin of the low voltage linear regulator U2. The Vout of the low voltage linear regulator U2 outputs a +3.3V DC voltage.

[0012] Further, the signal generation module includes a timer chip U6, a monostable flip-flop U7, an adjustable resistor R2, an adjustable capacitor C4, an N-type MOS transistor, an adjustable resistor R8, and a diode D2;

[0013] The Vcc and RESET of the timer chip U6 are both connected to the +5V DC power supply output terminal of the magnetic bead Z1. One end of the adjustable resistor R2 is connected to the TRIG of the timer chip U6, and the other end is connected to the DIS of the timer chip U6. The TRIG of the timer chip U6 is connected to the THR of the timer chip U6; one end of the adjustable resistor R2 is also connected to one end of the capacitor C1, and the other end of the capacitor C1 is grounded. The other end of the adjustable resistor R2 is also connected to one end of the resistor R1, and the other end of the resistor R1 is connected to the +5V DC power supply output terminal of the magnetic bead Z1. The CTRL of the timer chip U6 is connected to one end of the capacitor C2, and the other end of the capacitor C2 is grounded.

[0014] Further, the OUT of the timer chip U6 is connected to the A of the monostable flip-flop U7. The +5V DC power output terminal of the bead Z1 is connected to the A of the monostable flip-flop U7 in series with the resistor R3. The +5V DC power output terminal of the bead Z1 is connected to the CLR of the monostable flip-flop U7 in series with the resistor R4. The CLR of the monostable flip-flop U7 is grounded after being connected in series with the capacitor C3. The CEXT of the monostable flip-flop U7 is connected to the +5V DC power output terminal of the bead Z1 in series with the adjustable capacitor C4 and the resistor R5 in sequence. The REXT / CEXT of the monostable flip-flop U7 is connected between the adjustable capacitor C4 and the resistor R5. The VCC of the monostable flip-flop U7 is connected to the +5V DC power output terminal of the bead Z1.

[0015] Further, one path of the Q of the monostable flip-flop U7 is grounded after being connected in series with the capacitor C5, and the other path is connected to the gate G of the N-type MOS transistor. The Q of the monostable flip-flop U7 is connected to the gate G of the N-type MOS transistor. The drain D of the N-type MOS transistor is connected to the +5V DC power output terminal of the bead Z1 in series with the resistor R6 in the first path, grounded in series with the adjustable resistor R8 in the second path, outputs the gamma analog signal in series with the resistor R7 in the third path, and is grounded in series with the diode D2 in the fourth path. The source S of the N-type MOS transistor is grounded.

[0016] Further, the adjustable resistor R2 is used to adjust the frequency F of the square wave signal output by the clock chip U6, and the adjustment relationship is as follows:

[0017]

[0018] Further, the adjustable resistor R8 adjusts the amplitude Vpp of the pulse signal output by the drain D pin of the N-type MOS transistor Q1 through resistor voltage division, and its adjustment relationship is as follows:

[0019]

[0020] Compared with the prior art, the beneficial effects of the present utility model are as follows: The adjustable gamma signal generator of the present invention can comprehensively evaluate the gamma signal acquisition ability of the directional probe tube in a short time by precisely adjusting the signal parameters, which can greatly shorten the test cycle and improve the working efficiency of geological exploration, and solves the technical defects of the singularity and non-adjustability of the gamma signal analog output in the current directional probe tube test; at the same time, it has a wide range of adjustment capabilities, so it can meet the test requirements of different models and different parameters of directional probe tubes. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic block diagram of the adjustable gamma signal generator of the present utility model;

[0022] Figure 2 is Figure 1 the schematic diagram of the power supply module in

[0023] Figure 3For Figure 1 Schematic diagram of the signal generation module in Specific implementation mode

[0024] The present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0025] As Figure 1 described, the adjustable gamma signal generator includes a power supply module, a signal generation module, and a signal monitoring module.

[0026] The power supply module is used to convert the +25V voltage output by the directional probe into a +5V DC constant voltage source, and is also used to convert the +5V DC constant voltage source into a +3.3V DC constant voltage source; the +5V DC constant voltage source supplies power to the signal generation module, and the +3.3V DC constant voltage source supplies power to the signal monitoring module;

[0027] The signal generation module is used to generate an adjustable gamma analog signal, and adjust the frequency, pulse width, and amplitude of the gamma analog signal, so as to provide a precisely controllable gamma analog signal for the fixed signal acquisition range of the directional probe, thereby testing the performance of the directional probe in collecting gamma signals;

[0028] The signal monitoring module is used to accurately display the frequency, pulse width, and amplitude of the gamma analog signal.

[0029] As Figure 2 shown, the power supply module includes a diode D1 (model number 1N4007), a diode D3 (model number 1N4007), a low dropout voltage regulator chip U1 (model number BD450M5FP2-CZE2), a low voltage linear regulator U2 (model number LM1117-3.3), and a magnetic bead Z1 (model number BLM31PG121SN1L); the anode of the diode D1 is connected to the +25V DC power supply provided by the directional probe, and the cathode is connected to the Vin of the low dropout voltage regulator chip U1. The Vout of the low dropout voltage regulator chip U1 is connected to the +5V DC power supply input terminal of the magnetic bead Z1; the +5V DC power supply output terminal of the magnetic bead Z1 is connected to the anode of the diode D3, and the cathode of the diode D3 is connected to the Vin of the low voltage linear regulator U2. The Vout of the low voltage linear regulator U2 outputs a +3.3V DC voltage.

[0030] As Figure 3 shown, the signal generation module includes a timer chip U6 (model number TLC555), a monostable flip-flop U7 (model number 74L1G123DP), a variable resistor R2, a variable capacitor C4, an N-type MOS transistor (model number SSM3K341R), a variable resistor R8, and a diode D2 (model number TZMC5V1-GS08).

[0031] The Vcc and RESET of the timer chip U6 are both connected to the +5V DC power output terminal of the bead Z1. One end of the adjustable resistor R2 is connected to the TRIG of the timer chip U6, and the other end is connected to the DIS of the timer chip U6. The TRIG of the timer chip U6 is connected to the THR of the timer chip U6; one end of the adjustable resistor R2 is also connected to one end of the capacitor C1, and the other end of the capacitor C1 is grounded. The other end of the adjustable resistor R2 is also connected to one end of the resistor R1, and the other end of the resistor R1 is connected to the +5V DC power output terminal of the bead Z1. The CTRL of the timer chip U6 is connected to one end of the capacitor C2, and the other end of the capacitor C2 is grounded.

[0032] The OUT of the timer chip U6 is connected to the A of the monostable flip-flop U7. The +5V DC power output terminal of the bead Z1 is connected to the A of the monostable flip-flop U7 in series with the resistor R3. The +5V DC power output terminal of the bead Z1 is connected to the CLR of the monostable flip-flop U7 in series with the resistor R4. The CLR of the monostable flip-flop U7 is connected to the ground in series with the capacitor C3; the CEXT of the monostable flip-flop U7 is connected to the +5V DC power output terminal of the bead Z1 in series with the adjustable capacitor C4 and the resistor R5 in turn. The REXT / CEXT of the monostable flip-flop U7 is connected between the adjustable capacitor C4 and the resistor R5. The VCC of the monostable flip-flop U7 is connected to the +5V DC power output terminal of the bead Z1;

[0033] One path of the Q of the monostable flip-flop U7 is connected to the ground in series with the capacitor C5, and the other path is connected to the gate G of the N-type MOS transistor. The Q of the monostable flip-flop U7 is connected to the gate G of the N-type MOS transistor. The drain D of the N-type MOS transistor is connected to the +5V DC power output terminal of the bead Z1 in series with the resistor R6 in the first path, grounded in series with the adjustable resistor R8 in the second path, outputs the gamma analog signal in series with the resistor R7 in the third path, and is grounded in series with the diode D2 in the fourth path. The source S of the N-type MOS transistor is grounded.

[0034] The adjustable resistor R2 is used to adjust the frequency F of the square wave signal output by the clock chip U6, and the adjustment relationship is as follows:

[0035]

[0036] By adjusting the resistance value of R2, the control of the square wave signal output by the clock chip U6 is realized, so that a gamma signal with a frequency of 95Hz to 286Hz can be provided to the directional probe.

[0037] The adjustable capacitor C4 is used to adjust the pulse width T of the pulse signal output by the monostable flip-flop U7 W , and its adjustment relationship is as follows (the information comes from the data sheet of the monostable flip-flop chip 74LVC1G123):

[0038] VCC C4 <![CDATA[T W (Pulse Width)]]> 2.7V - 5.5V 100 pF 1.8 μS 2.7V - 5.5V 0.01 μF 110 μS 2.7V - 5.5V 0.1 μF 1050 μS

[0039] By adjusting the capacitance of C4, the control of the square wave signal output by the monostable flip-flop U7 is achieved, so that a gamma signal with a pulse width of 1.8 μS to 1050 μS can be provided to the directional probe.

[0040] The adjustable resistor R8 adjusts the amplitude (A / D converter) Vpp of the pulse signal output by the drain D pin of the N-type MOS transistor Q1 through resistor voltage division, and its adjustment relationship is as follows:

[0041]

[0042] By adjusting the resistance value of R8, the control of the amplitude of the gamma signal output by the drain D of the N-type MOS transistor Q1 is achieved, so that a gamma signal with a signal amplitude of 2.5 V to 5 V can be provided to the directional probe.

[0043] The adjustable gamma signal generator of the present invention can comprehensively evaluate the gamma signal acquisition ability of the directional probe in a short time by precisely adjusting the signal parameters, which can greatly shorten the test cycle and improve the working efficiency of geological exploration. At the same time, it has a wide range of adjustment capabilities, so it can adapt to the test requirements of directional probes with different models and different parameters.

Claims

1. An adjustable gamma signal generator, characterized in that: Including power supply module, signal generation module and signal monitoring module; The power supply module is used to convert the +25V voltage output by the directional probe into a +5V DC constant voltage source, and convert the +5V DC constant voltage source into a +3.3V DC constant voltage source; the +5V DC constant voltage source supplies power to the signal generation module, and the +3.3V DC constant voltage source supplies power to the signal monitoring module; The signal generation module is used to generate an adjustable gamma analog signal and adjust the frequency, pulse width and amplitude of the gamma analog signal; The signal monitoring module is used to display the frequency, pulse width and amplitude of the gamma analog signal.

2. The adjustable gamma signal generator according to claim 1, characterized in that: The power supply module includes a diode D1, a diode D3, a low voltage difference voltage regulator chip U1, a low voltage linear voltage regulator U2 and a magnetic bead Z1; the anode of the diode D1 is connected to the +25V DC power supply provided by the directional probe, the cathode is connected to the Vin of the low voltage difference voltage regulator chip U1, and the Vout of the low voltage difference voltage regulator chip U1 is connected to the +5V DC power input end of the magnetic bead Z1; the +5V DC power output end of the magnetic bead Z1 is connected to the anode of the diode D3, the cathode of the diode D3 is connected to the Vin of the low voltage linear voltage regulator U2, and the Vout of the low voltage linear voltage regulator U2 outputs a +3.3V DC voltage.

3. The adjustable gamma signal generator according to claim 2, characterized in that: The signal generating module includes a timer chip U6, a monostable trigger U7, an adjustable resistor R2, an adjustable capacitor C4, an N-type MOS tube, an adjustable resistor R8 and a diode D2; The Vcc and RESET of the timer chip U6 are both connected to the +5V DC power output end of the magnetic bead Z1, one end of the adjustable resistor R2 is connected to the TRIG of the timer chip U6, and the other end is connected to the DIS of the timer chip U6, and the TRIG of the timer chip U6 is connected to the THR of the timer chip U6; one end of the adjustable resistor R2 is also connected to one end of the capacitor C1, and the other end of the capacitor C1 is grounded, the other end of the adjustable resistor R2 is also connected to one end of the resistor R1, and the other end of the resistor R1 is connected to the +5V DC power output end of the magnetic bead Z1, and the CTRL of the timer chip U6 is connected to one end of the capacitor C2, and the other end of the capacitor C2 is grounded.

4. The adjustable gamma signal generator according to claim 3, characterized in that: The OUT of the timer chip U6 is connected to the A of the monostable trigger U7, the +5V DC power supply output end of the magnetic bead Z1 is connected in series with the resistor R3 and then connected to the A of the monostable trigger U7, the +5V DC power supply output end of the magnetic bead Z1 is connected in series with the resistor R4 and then connected to the CLR of the monostable trigger U7, the CLR of the monostable trigger U7 is connected in series with the capacitor C3 and then grounded; the CEXT of the monostable trigger U7 is connected in series with the adjustable capacitor C4 and the resistor R5 in sequence and then connected to the +5V DC power supply output end of the magnetic bead Z1, the REXT / CEXT of the monostable trigger U7 is connected between the adjustable capacitor C4 and the resistor R5, and the VCC of the monostable trigger U7 is connected to the +5V DC power supply output end of the magnetic bead Z1.

5. The adjustable gamma signal generator according to claim 4, characterized in that: The Q of the monostable trigger U7 is connected in series with a capacitor C5 and then grounded, and another path is connected to the gate G of the N-type MOS tube and connected to the Q of the monostable trigger U7. The drain D of the N-type MOS tube is connected in series with a resistor R6 and then connected to the +5V DC power supply output end of the magnetic bead Z1, the second path is connected in series with an adjustable resistor R8 and then grounded, the third path is connected to the resistor R7 to output the gamma analog signal, the fourth path is connected in series with a diode D2 and then grounded, and the source S of the N-type MOS tube is grounded.

6. The adjustable gamma signal generator according to claim 3, characterized in that: The adjustable resistor R2 is used to adjust the frequency F of the square wave signal output by the clock chip U6. The adjustment relationship is as follows:

7. The adjustable gamma signal generator according to claim 5, characterized in that: The adjustable resistor R8 adjusts the pulse signal amplitude Vpp outputted from the drain pin D of the N-type MOS tube Q1 by means of resistor voltage division, and the adjustment relationship is as follows:

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