Part Number: TDC1000-GASEVM
Hello,
I am trying to use the TDC1000-GASEVM as a flow meter, so that ultimatley I can sense the purity of gas in the flow. Currently I am just using a 3D printed test rig incorperating reflectors (figure 1), and will pass argon through it from a bottle once I can configure the boards to work as I'm expecting, using the GUI supplied by TI.
I would like to make a time of flight measurement in one direction, then swap the transducers' roles and make a time of flight measurement in the other direction, I believed I had set the configuration files correctly, but evidently I am missing something. I get a much shorter time of flight than expected for my path, and curiosly this doesn't appear to change when I disconnect my transucers. I'm not sure what to make of this and am struggling to trouble shoot because I'm not 100% sure that the transducers are functioning as I would like them to.
The transducers I am using are 300kHz, connected to the higher voltage booster board (see figure 2), and I have uploaded my coniguration files also. The path fom transducer 1 to transducer 2 is 7.2cm, making the calculated time of flight around 218us and they are connected to the nylon using Loctite 406 with a layer of hot glue on top.
Config files: TDC1000_Config0 24
TDC1000_Config1 40
TDC1000_Config2 12
TDC1000_Config3 0D
TDC1000_Config4 5F
TDC1000_TOF-1 40
TDC1000_TOF-0 1E
TDC1000_Error_Flags 00
TDC1000_Timeout 23
TDC1000_Clock_Rate 01
TDC1000_Conts_Trigger 00
TDC7200_Config1 82
TDC7200_Config2 40
TDC7200_Interrupt_Status 06
TDC7200_Interrupt_Mask 07
TDC7200_Coarse_Cntr_Ov_H FF
TDC7200_Coarse_Cntr_Ov_L FF
TDC7200_Clock_Cntr_Ov_H FF
TDC7200_Clock_Cntr_Ov_L FF
TDC7200_Clock_Cntr_Stop_Mask_H 00
TDC7200_Clock_Cntr_Stop_Mask_L 00
TRIGGER_UPDATE_FREQ 0000
TDC_AVG/STDEV_NUM_ELEMS 00C8
SAVE_GRAPH_DATA_TO_FILE 00
FLOW_MODE_SELECT 00
Y-SCALE_CENTER 0032
X-SCALE_RANGE 0032
MEASURE_RTD1 00
SAVE_RESULT_REGR_TO_FILE 00
GRAPH_MULTI_STOPS 00
TDC_SELECT 00
TEMP_RTD_SELECT 00
TEMP_RTD_MODE 00
TEMP_AVG/STDEV_NUM_ELEMS 000A
SAVE_TEMP_DATA 00
GRAPH_YMAX_DATA 000000000000036A
GRAPH_YMIN_DATA 0000000000000306
TDC1000-HV_DRV_EN1 01
TDC1000-HV_DRV_EN2 01
HV_DRV_EN1_Period 012C
HV_DRV_EN2_Period 012C
ENABLE_POWER_CYCLE 00
CLK_FREQ_(1-16MHz) 1.200000
CLK_SOURCE_SEL 02
CPU_CLK_FREQ 04
CPU_CLK_EN 01
TDC1000-HV_BST_PWR_EN 01
HV_BST_PWR_EN_Period 0000
FWD2REV_FLOW_DELAY 0000
TDC1000-IMPE_MATCH_EN 00
ENABLE_UART_STREAM 00
ENABLE_MSP430TIMER_TDC 00
TDC1000_Config0 24
TDC1000_Config1 40
TDC1000_Config2 11
TDC1000_Config3 0D
TDC1000_Config4 5F
TDC1000_TOF-1 40
TDC1000_TOF-0 1E
TDC1000_Error_Flags 00
TDC1000_Timeout 23
TDC1000_Clock_Rate 01
TDC1000_Conts_Trigger 00
TDC7200_Config1 82
TDC7200_Config2 40
TDC7200_Interrupt_Status 06
TDC7200_Interrupt_Mask 07
TDC7200_Coarse_Cntr_Ov_H FF
TDC7200_Coarse_Cntr_Ov_L FF
TDC7200_Clock_Cntr_Ov_H FF
TDC7200_Clock_Cntr_Ov_L FF
TDC7200_Clock_Cntr_Stop_Mask_H 00
TDC7200_Clock_Cntr_Stop_Mask_L 00
TRIGGER_UPDATE_FREQ 0000
TDC_AVG/STDEV_NUM_ELEMS 00C8
SAVE_GRAPH_DATA_TO_FILE 00
FLOW_MODE_SELECT 00
Y-SCALE_CENTER 0032
X-SCALE_RANGE 0032
MEASURE_RTD1 00
SAVE_RESULT_REGR_TO_FILE 00
GRAPH_MULTI_STOPS 00
TDC_SELECT 00
TEMP_RTD_SELECT 00
TEMP_RTD_MODE 00
TEMP_AVG/STDEV_NUM_ELEMS 000A
SAVE_TEMP_DATA 00
GRAPH_YMAX_DATA 000000000000036A
GRAPH_YMIN_DATA 0000000000000306
TDC1000-HV_DRV_EN1 01
TDC1000-HV_DRV_EN2 01
HV_DRV_EN1_Period 012C
HV_DRV_EN2_Period 012C
ENABLE_POWER_CYCLE 00
CLK_FREQ_(1-16MHz) 1.200000
CLK_SOURCE_SEL 02
CPU_CLK_FREQ 04
CPU_CLK_EN 01
TDC1000-HV_BST_PWR_EN 01
HV_BST_PWR_EN_Period 0000
FWD2REV_FLOW_DELAY 0000
TDC1000-IMPE_MATCH_EN 00
ENABLE_UART_STREAM 00
ENABLE_MSP430TIMER_TDC 00
Figure 1 (test rig):
Figure 2 (connection to BST board):